LegalizeThe Water Framework Directive (Priority Substances and Classification) Regulations (Northern Ireland) 2011
| Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) |
|---|---|---|---|---|---|
| (10-percentile) | (10-percentile) | (10-percentile) | (10-percentile) | (10-percentile) | (10-percentile) |
| (1)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type[^f01001] | High | Good | Moderate | Poor | Bad |
| Upland and low alkalinity | 80 | 75 | 64 | 50 | < 50 |
| Lowland and high alkalinity | 70 | 60 | 54 | 45 | < 45 |
| Total ammonia^f01002 | Total ammonia^f01002 | Total ammonia^f01002 | Total ammonia^f01002 | Total ammonia^f01002 | Total ammonia^f01002 |
| --- | --- | --- | --- | --- | --- |
| (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) |
| (1)Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements. | (1)Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements. | (1)Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements. | (1)Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements. | (1)Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements. | (1)Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements. |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type | High | Good | Moderate | Poor | Bad |
| Upland and low alkalinity | 0.2 | 0.3 | 0.75 | 1.1 | > 1.1 |
| Lowland and high alkalinity | 0.3 | 0.6 | 1.1 | 2.5 | > 2.5 |
| Biochemical oxygen demand (mg/l)[^f01003] | Biochemical oxygen demand (mg/l)[^f01003] | Biochemical oxygen demand (mg/l)[^f01003] | Biochemical oxygen demand (mg/l)[^f01003] | Biochemical oxygen demand (mg/l)[^f01003] | Biochemical oxygen demand (mg/l)[^f01003] |
| --- | --- | --- | --- | --- | --- |
| (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) |
| (1)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (1)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (1)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (1)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (1)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (1)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. |
| (2)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (2)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (2)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (2)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (2)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. | (2)Where a lowland, high alkalinity river is a salmonid river the standards for the upland, low alkalinity type will apply. |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type[^f01004] | High | Good | Moderate | Poor | Bad |
| Upland and low alkalinity | 3 | 4 | 6 | 7.5 | > 7.5 |
| Lowland and high alkalinity | 4 | 5 | 6.5 | 9 | > 9 |
| Temperature (◦C) as an annual 98th percentile standard | Temperature (◦C) as an annual 98th percentile standard | Temperature (◦C) as an annual 98th percentile standard | Temperature (◦C) as an annual 98th percentile standard | Temperature (◦C) as an annual 98th percentile standard | |
| --- | --- | --- | --- | --- | |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| Type | High | Good | Moderate | Poor | |
| Salmonid | 20 | 23 | 28 | 30 | |
| Cyprinid | 25 | 28 | 30 | 32 | |
| Permitted abstraction per day as a percentage of the natural mean daily flow(Q)[^f01005] | Permitted abstraction per day as a percentage of the natural mean daily flow(Q)[^f01005] | Permitted abstraction per day as a percentage of the natural mean daily flow(Q)[^f01005] | |||
| --- | --- | --- | |||
| High | High | High | |||
| (1)‘Q’ is the mean daily flow for a specified period of time | (1)‘Q’ is the mean daily flow for a specified period of time | (1)‘Q’ is the mean daily flow for a specified period of time | |||
| (2)‘Qx’ is the Q that is expected to be exceeded by ‘x’ percent for a specified period of time | (2)‘Qx’ is the Q that is expected to be exceeded by ‘x’ percent for a specified period of time | (2)‘Qx’ is the Q that is expected to be exceeded by ‘x’ percent for a specified period of time | |||
| Column 1 | Column 2 | Column 3 | |||
| Column 1 | Maximum permitted % abstraction at Q exceeding Q₉₅[^f01006] | Maximum permitted % abstraction at Q notexceeding Q₉₅ | |||
| A1, A2 (downstream), A2 (headwaters), B1, B2, C2, D2 | 10 | 5 | |||
| Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | |
| --- | --- | --- | --- | --- | |
| Good | Good | Good | Good | Good | |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| River type | Maximum % abstraction at Q exceeding Q₆₀ | Maximum % abstraction at Q exceeding Q₇₀ | Maximum % abstraction at Q exceeding Q₉₅ | Maximum % abstraction at Q not exceeding Q₉₅ | |
| A1 | 35 | 30 | 25 | 20 | |
| A2 (downstream), B1, B2 | 30 | 25 | 20 | 15 | |
| A2 (headwaters), C2, D2 | 25 | 20 | 15 | 10 | |
| Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | |
| --- | --- | --- | --- | --- | |
| Moderate | Moderate | Moderate | Moderate | Moderate | |
| (1)incremental increase in allowable take at flows <Q₆₀ to ≥ Q₉₀ | (1)incremental increase in allowable take at flows <Q₆₀ to ≥ Q₉₀ | (1)incremental increase in allowable take at flows <Q₆₀ to ≥ Q₉₀ | (1)incremental increase in allowable take at flows <Q₆₀ to ≥ Q₉₀ | (1)incremental increase in allowable take at flows <Q₆₀ to ≥ Q₉₀ | |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| River type | Maximum % abstraction at Q exceeding Q₆₀ | Maximum % abstraction at Q exceeding Q₉₀ | Maximum % abstraction at Q exceeding Q₉₅ | Maximum % abstraction at Q not exceeding Q₉₅ | |
| A1 | 70 | 50-70[^f01007] | 50 | 45 | |
| A2 (downstream), B1, B2, | 70 | 45-70[^f01007] | 45 | 40 | |
| A2 (headwaters), C2, D2 | 70 | 40-70[^f01007] | 40 | 35 | |
| Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | |
| --- | --- | --- | --- | --- | |
| Poor | Poor | Poor | Poor | Poor | |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| River type | Maximum % abstraction at Q exceeding Q₆₀ | Maximum % abstraction at Q exceeding Q₉₀ | Maximum % abstraction at Q exceeding Q₉₅ | Maximum % abstraction at Q not exceeding Q₉₅ | |
| A1 | Qx less 25% of Q₉₀ | Qx less 25% of Q₉₀ | 75 | 70 | |
| A2 (downstream), B1, B2, | Qx less 30% of Q₉₀ | Qx less 30% of Q₉₀ | 70 | 65 | |
| A2 (headwaters), C2, D2 | Qx less 35% of Q₉₀ | Qx less 35% of Q₉₀ | 65 | 60 | |
| Status | Mean in July – August (mg/l) | Mean in July – August (mg/l) | |||
| --- | --- | --- | |||
| Status | Salmonid | Cyprinid | |||
| High | 9 | 8 | |||
| Good | 7 | 6 | |||
| Moderate | 4 | 4 | |||
| Poor | 1 | 1 | |||
| Bad | < 1 | < 1 | |||
| Status | Proposed Boundary | ||||
| --- | --- | ||||
| Status | Annual Mean (micro Siemens per centimetre) | ||||
| Good | 1000 | ||||
| Annual mean concentration of total phosphorous (µg/l) | Annual mean concentration of total phosphorous (µg/l) | Annual mean concentration of total phosphorous (µg/l) | Annual mean concentration of total phosphorous (µg/l) | Annual mean concentration of total phosphorous (µg/l) | |
| --- | --- | --- | --- | --- | |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| High | Good | Moderate | Poor | Bad | |
| R ÷ H; or 5, whichever is the larger value | R ÷ G; or 8, whichever is the larger value | (R ÷ G) ÷ 0.5 | (R ÷ G) ÷ 0.25 | > (R ÷ G) ÷ 0.25 | |
| Annual mean concentration of total phosphorus (µg/l) | Annual mean concentration of total phosphorus (µg/l) | Annual mean concentration of total phosphorus (µg/l) | Annual mean concentration of total phosphorus (µg/l) | Annual mean concentration of total phosphorus (µg/l) | Annual mean concentration of total phosphorus (µg/l) |
| --- | --- | --- | --- | --- | --- |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Geological and depth category | High | Good | Moderate | Poor | Bad |
| High alkalinity; shallow | 16 | 23 | 46 | 92 | > 92 |
| High alkalinity; very shallow | 23 | 31 | 62 | 124 | > 124 |
| Moderate alkalinity; deep | 8 | 12 | 24 | 48 | > 48 |
| Moderate alkalinity; shallow | 11 | 16 | 32 | 64 | > 64 |
| Moderate alkalinity; very shallow | 15 | 22 | 44 | 88 | > 88 |
| Low alkalinity; deep | 5 | 8 | 16 | 32 | > 32 |
| Low alkalinity; shallow | 7 | 10 | 20 | 40 | > 40 |
| Low alkalinity; very shallow | 9 | 14 | 28 | 56 | > 56 |
| Marl; shallow | 9 | 20 | 40 | 80 | > 80 |
| Marl; very shallow | 10 | 24 | 48 | 96 | > 96 |
| Daily maximum % reduction in the habitable zone lake surface area for 99% of the days in any year | Daily maximum % reduction in the habitable zone lake surface area for 99% of the days in any year | Daily maximum % reduction in the habitable zone lake surface area for 99% of the days in any year | Daily maximum % reduction in the habitable zone lake surface area for 99% of the days in any year | ||
| --- | --- | --- | --- | ||
| (1)The reference conditions lake surface area means the natural lake surface area in the absence of any abstractions, discharges or other man-made influences | (1)The reference conditions lake surface area means the natural lake surface area in the absence of any abstractions, discharges or other man-made influences | (1)The reference conditions lake surface area means the natural lake surface area in the absence of any abstractions, discharges or other man-made influences | (1)The reference conditions lake surface area means the natural lake surface area in the absence of any abstractions, discharges or other man-made influences | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| High | Good | Moderate | Poor | ||
| 1 | 5 | 10 | 20 | ||
| The habitable zone lake surface is dependent on whether the lake is considered to have the geological sub-type “Peat” or “Non-Peat”.The habitable zone lake surface area means the proportion of the reference conditions[^f01008] lake surface area from the shore to a depth 5 metres deeper than the depth to which light penetration to the lake bed would be sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae.In the absence of field data to the contrary, the depth to which light penetration to the lake bed is sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae may be taken to be 2 metres for lakes with the geological sub-type of “Peat” and 7 metres for “Non-Peat” lakes. The lake habitable zone extends 5m below the level of light penetration to account for impacts on the aphotic habitat. | The habitable zone lake surface is dependent on whether the lake is considered to have the geological sub-type “Peat” or “Non-Peat”.The habitable zone lake surface area means the proportion of the reference conditions[^f01008] lake surface area from the shore to a depth 5 metres deeper than the depth to which light penetration to the lake bed would be sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae.In the absence of field data to the contrary, the depth to which light penetration to the lake bed is sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae may be taken to be 2 metres for lakes with the geological sub-type of “Peat” and 7 metres for “Non-Peat” lakes. The lake habitable zone extends 5m below the level of light penetration to account for impacts on the aphotic habitat. | The habitable zone lake surface is dependent on whether the lake is considered to have the geological sub-type “Peat” or “Non-Peat”.The habitable zone lake surface area means the proportion of the reference conditions[^f01008] lake surface area from the shore to a depth 5 metres deeper than the depth to which light penetration to the lake bed would be sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae.In the absence of field data to the contrary, the depth to which light penetration to the lake bed is sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae may be taken to be 2 metres for lakes with the geological sub-type of “Peat” and 7 metres for “Non-Peat” lakes. The lake habitable zone extends 5m below the level of light penetration to account for impacts on the aphotic habitat. | The habitable zone lake surface is dependent on whether the lake is considered to have the geological sub-type “Peat” or “Non-Peat”.The habitable zone lake surface area means the proportion of the reference conditions[^f01008] lake surface area from the shore to a depth 5 metres deeper than the depth to which light penetration to the lake bed would be sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae.In the absence of field data to the contrary, the depth to which light penetration to the lake bed is sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae may be taken to be 2 metres for lakes with the geological sub-type of “Peat” and 7 metres for “Non-Peat” lakes. The lake habitable zone extends 5m below the level of light penetration to account for impacts on the aphotic habitat. | ||
| Dissolved oxygen concentrations (mg/l) as 5-percentile values | |||||
| --- | --- | ||||
| High | 5.7 | ||||
| Good | 4.0 | ||||
| Moderate | 2.4 | ||||
| Poor | 1.6 | ||||
| Bad | <1.6 | ||||
| Dissolved oxygen concentrations (mg/l) as 5-percentile values | |||||
| --- | --- | ||||
| High | ≥5.7 | ||||
| Good | ≥4.0 and <5.7 | ||||
| Moderate | ≥2.4 and <4.0 | ||||
| Poor | ≥1.6 and <2.4 | ||||
| Bad | <1.6 | ||||
| Mean dissolved inorganic nitrogen concentration (micromoles per litre) during the period 1st December to 28th February | |||||
| --- | --- | ||||
| High | 12 | ||||
| Good | 18 | ||||
| Moderate | 30 | ||||
| Poor | 40.5 | ||||
| Bad | >40.5 | ||||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | ||
| Column 1 | Column 2[^f01009] | Column 3 | Column 4[^f01009] | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 0.3 | 1.3 | 0.3 | 1.3 | ||
| Good standard for rivers and freshwater lakes | Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | Good standard for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 4.2 | 140 | 0.42 | 6 | ||
| Good standard for rivers and freshwater lakes | Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | Good standard for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 0.2 | 5.4 | 0.2 | 5.4 | ||
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||||
| --- | --- | ||||
| (1)The standard for arsenic refers to the dissolved fraction of a water sample obtained by filtration through a 0.45µm filter or any equivalent pre-treatment | (1)The standard for arsenic refers to the dissolved fraction of a water sample obtained by filtration through a 0.45µm filter or any equivalent pre-treatment | ||||
| Column 1[^f01010] | Column 2[^f01010] | ||||
| Annual mean (µg/l) | Annual mean (µg/l) | ||||
| 50 | 25 | ||||
| Good standard for rivers and freshwater lakes | Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | Good standard for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 1 | Column 2 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 7.5 | 51 | 0.75 | 10 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | ||||
| --- | --- | ||||
| Column 1 | Column 2 | ||||
| Annual mean (µg/l) | 95-percentile (µg/l) | ||||
| 0.15 | 0.7 | ||||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standard for transitional and coastal waters | |||
| --- | --- | --- | |||
| (1)The standards for chlorine specified in Column 2 and 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for chlorine specified in Column 2 and 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for chlorine specified in Column 2 and 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | |||
| (2)The term “total residual oxidants” refers to the sum of all oxidising agents existing in water, expressed as available chlorine. | (2)The term “total residual oxidants” refers to the sum of all oxidising agents existing in water, expressed as available chlorine. | (2)The term “total residual oxidants” refers to the sum of all oxidising agents existing in water, expressed as available chlorine. | |||
| Column 1 | Column 2[^f01011] | Column 3[^f01011] | |||
| Annual mean concentration (µg/l) of total available chlorine | 95-percentile concentration (µg/l) of total available chlorine | 95-percentile concentration (µg/l) of total residual oxidant[^f01012] | |||
| 2 | 5 | 10 | |||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | ||||
| --- | --- | ||||
| Column 1 | Column 2 | ||||
| Annual mean (µg/l) | 95-percentile (µg/l) | ||||
| 0.035 | 1.2 | ||||
| Good standard for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | |||
| --- | --- | --- | |||
| (1)The standard for chromium VI specified in column 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standard for chromium VI specified in column 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standard for chromium VI specified in column 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | |||
| Column 1 | Column 2 | Column 3[^f01013] | |||
| Annual mean concentration (µg/l) of dissolved chromium VI | Annual mean concentration (µg/l) of dissolved chromium VI | 95-percentile concentration (µg/l) of dissolved chromium VI | |||
| 3.4 | 0.6 | 32 | |||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | ||||
| --- | --- | ||||
| (1)The standard for chromium III specified in column 2 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water | (1)The standard for chromium III specified in column 2 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water | ||||
| Column 1 | Column 2[^f01014] | ||||
| Annual mean concentration (µg/l) of dissolved chromium III | 95-percentile concentration (µg/l) of dissolved chromium III | ||||
| 4.7 | 32 | ||||
| Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters[^f01016] | ||||
| --- | --- | ||||
| (1)bioavailable means the fraction of the dissolved concentration of copper likely to result in toxic effects as determined using the Metal Bioavailability Assessment Tool (also referred to as a PNEC Estimator) for copper. | (1)bioavailable means the fraction of the dissolved concentration of copper likely to result in toxic effects as determined using the Metal Bioavailability Assessment Tool (also referred to as a PNEC Estimator) for copper. | ||||
| (2)The recommended salt water standard applies to the fraction of a water sample that passes through a 0.45-µm filter or that is obtained by any equivalent pre-treatment. | (2)The recommended salt water standard applies to the fraction of a water sample that passes through a 0.45-µm filter or that is obtained by any equivalent pre-treatment. | ||||
| (3)“DOC” means the annual mean concentration of dissolved organic carbon in mg/l. | (3)“DOC” means the annual mean concentration of dissolved organic carbon in mg/l. | ||||
| Column 1 | Column 2 | ||||
| Annual mean concentration (µg/l) of dissolved copper | Annual mean concentration (µg/l) of dissolved copper | ||||
| 1(bioavailable)[^f01015] | 3.76 µg/l dissolved, where DOC[^f01017] ≤ 1 mg/l | ||||
| 1(bioavailable)[^f01015] | 3.76 +(2.677 × ((DOC/2) - 0.5)) µg/l dissolved, where DOC > 1 mg/l | ||||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | ||
| Column 1 | Column 2[^f01018] | Column 3 | Column 4[^f01018] | ||
| Annual mean concentration (µg/l) of ‘free’ cyanide (HCN and CN) | 95-percentile concentration (µg/l) of ‘free’cyanide (HCN and CN) | Annual mean concentration (µg/l) of hydrogen cyanide | 95-percentile concentration (µg/l) of hydrogen cyanide | ||
| 1 | 5 | 1 | 5 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| Annual mean (ng/l) | 0.1 | Annual mean (ng/l) | 0.1 | ||
| 95-percentile (ng/l) | 0.4 | 95-percentile (ng/l) | 0.41 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 0.01 | 0.02 | 0.01 | 0.26 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 0.48 | 4.0 | 0.48 | 4.0 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 196 | 398 | 196 | 398 | ||
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||||
| --- | --- | ||||
| Column 1 | Column 2 | ||||
| Annual mean concentration (mg/l) of dissolved iron | Annual mean concentration (mg/l) of dissolved iron | ||||
| 1 | 1 | ||||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | ||
| --- | --- | --- | --- | ||
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 0.5 | 0.9 | 0.5 | 0.9 |
| Good standard for rivers and freshwater lakes |
|---|
| (1)bioavailable means the fraction of the dissolved concentration of manganese likely to result in toxic effects as determined in accordance with the Metal Bioavailability Assessment Tool for manganese. |
| Annual mean (µg/l) bioavailable |
| 123[^f01019] |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
|---|---|---|---|
| Column 1 | Column 2 | Column 3 | Column 4 |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 18 | 187 | 18 | 187 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | ||
| --- | --- | ||
| Column 1 | Column 2 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 0.01 | 0.77 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | ||
| --- | --- | ||
| Column 1 | Column 2 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 0.3 | 0.58 | ||
| Good standard for rivers and freshwater lakes | Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | Good standard for transitional and coastal waters |
| --- | --- | --- | --- |
| Column 1 | Column 2 | Column 3 | Column 4 |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 0.001 | 0.01 | 0.0002 | 0.001 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| Column 1 | Column 2 | Column 3 | Column 4 |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 7.7 | 46 | 7.7 | 46 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | ||
| --- | --- | ||
| Column 1 | Column 2 | ||
| Annual mean (µg/l) | 95-percentile (µg/l) | ||
| 140 | 1848 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| Column 1 | Column 2 | Column 3 | Column 4 |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 74 | 380 | 74 | 370 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| Column 1 | Column 2 | Column 3 | Column 4 |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 0.1 | 0.28 | 0.1 | 0.28 |
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||
| --- | --- | ||
| Annual mean (µg/l) | Annual mean (µg/l) | ||
| Not applicable | 21 | ||
| Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | ||
| --- | --- | ||
| (1)bioavailable means the fraction of the dissolved concentration of zinc likely to result in toxic effects as determined using the Metal Bioavailability Assessment Tool (also referred to as a PNEC Estimator) for zinc. | (1)bioavailable means the fraction of the dissolved concentration of zinc likely to result in toxic effects as determined using the Metal Bioavailability Assessment Tool (also referred to as a PNEC Estimator) for zinc. | ||
| (2)Ambient Background Concentration is an estimate of background levels of zinc based on a low percentile of monitoring data. A figure of 1 µg/l has been estimated for freshwaters in Northern Ireland. | (2)Ambient Background Concentration is an estimate of background levels of zinc based on a low percentile of monitoring data. A figure of 1 µg/l has been estimated for freshwaters in Northern Ireland. | ||
| Column 1 | Column 2 | ||
| Annual mean | Annual mean | ||
| 10.9 bioavailable[^f01020] plus Ambient Background Concentration[^f01021] (µg/l) dissolved | 6.8 dissolved plus Ambient Background Concentration (µg/l) | ||
| Name of substance | Chemical Abstracts Service number | All rivers and lakes | All rivers and lakes |
| --- | --- | --- | --- |
| Name of substance | Chemical Abstracts Service number | Good | Good |
| Name of substance | Chemical Abstracts Service number | Annual mean[^f01022] (AA-EQS) (µg/l) | Maximum allowable concentration[^f01023] (MAC-EQS) (µg/l) |
| (i)This parameter is the Environmental Quality Standard expressed as an annual average value (AA-EQS). Unless otherwise specified, it applies to the total concentrations of all isomers of the pollutant concerned. | (i)This parameter is the Environmental Quality Standard expressed as an annual average value (AA-EQS). Unless otherwise specified, it applies to the total concentrations of all isomers of the pollutant concerned. | (i)This parameter is the Environmental Quality Standard expressed as an annual average value (AA-EQS). Unless otherwise specified, it applies to the total concentrations of all isomers of the pollutant concerned. | (i)This parameter is the Environmental Quality Standard expressed as an annual average value (AA-EQS). Unless otherwise specified, it applies to the total concentrations of all isomers of the pollutant concerned. |
| (ii)This parameter is the Environmental Quality Standard expressed as a maximum allowable concentration (MAC-EQS). Where the MAC-EQS are marked as “not applicable”, the AA-EQS values are considered protective against short-term pollution peaks in continuous discharges since they are significantly lower than the values derived on the basis of acute toxicity. | (ii)This parameter is the Environmental Quality Standard expressed as a maximum allowable concentration (MAC-EQS). Where the MAC-EQS are marked as “not applicable”, the AA-EQS values are considered protective against short-term pollution peaks in continuous discharges since they are significantly lower than the values derived on the basis of acute toxicity. | (ii)This parameter is the Environmental Quality Standard expressed as a maximum allowable concentration (MAC-EQS). Where the MAC-EQS are marked as “not applicable”, the AA-EQS values are considered protective against short-term pollution peaks in continuous discharges since they are significantly lower than the values derived on the basis of acute toxicity. | (ii)This parameter is the Environmental Quality Standard expressed as a maximum allowable concentration (MAC-EQS). Where the MAC-EQS are marked as “not applicable”, the AA-EQS values are considered protective against short-term pollution peaks in continuous discharges since they are significantly lower than the values derived on the basis of acute toxicity. |
| (iii)For the group of priority substances covered by brominated diphenylethers listed in Decision 2455/2001/EC, an EQS is established only for congener numbers 28, 47, 99, 100, 153 and 154. | (iii)For the group of priority substances covered by brominated diphenylethers listed in Decision 2455/2001/EC, an EQS is established only for congener numbers 28, 47, 99, 100, 153 and 154. | (iii)For the group of priority substances covered by brominated diphenylethers listed in Decision 2455/2001/EC, an EQS is established only for congener numbers 28, 47, 99, 100, 153 and 154. | (iii)For the group of priority substances covered by brominated diphenylethers listed in Decision 2455/2001/EC, an EQS is established only for congener numbers 28, 47, 99, 100, 153 and 154. |
| (iv)For cadmium and its compounds the EQS values vary dependent upon the hardness of the water as specified in five class categories (class 1: <40mg CaCO₃/l, class 2: 40 to <50mg CaCO₃/l, class 3: 50 to <100mg CaCO₃/l, class 4: 100 to <200mg CaCO₃/l and class 5: ≥200mg CaCO₃/l). | (iv)For cadmium and its compounds the EQS values vary dependent upon the hardness of the water as specified in five class categories (class 1: <40mg CaCO₃/l, class 2: 40 to <50mg CaCO₃/l, class 3: 50 to <100mg CaCO₃/l, class 4: 100 to <200mg CaCO₃/l and class 5: ≥200mg CaCO₃/l). | (iv)For cadmium and its compounds the EQS values vary dependent upon the hardness of the water as specified in five class categories (class 1: <40mg CaCO₃/l, class 2: 40 to <50mg CaCO₃/l, class 3: 50 to <100mg CaCO₃/l, class 4: 100 to <200mg CaCO₃/l and class 5: ≥200mg CaCO₃/l). | (iv)For cadmium and its compounds the EQS values vary dependent upon the hardness of the water as specified in five class categories (class 1: <40mg CaCO₃/l, class 2: 40 to <50mg CaCO₃/l, class 3: 50 to <100mg CaCO₃/l, class 4: 100 to <200mg CaCO₃/l and class 5: ≥200mg CaCO₃/l). |
| (v)DDT total comprises the sum of the isomers 1,1,1-trichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 50-29-3; EU number 200-024-3); 1,1,1-trichloro-2 (o-chlorophenyl)-2-(p-chlorophenyl) ethane (CAS number 789-02-6; EU number 212-332-5); 1,1-dichloro-2,2 bis (p-chlorophenyl) ethylene (CAS number 72-55-9; EU number 200-784-6); and 1,1-dichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 72-54-8; EU number 200-783-0). | (v)DDT total comprises the sum of the isomers 1,1,1-trichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 50-29-3; EU number 200-024-3); 1,1,1-trichloro-2 (o-chlorophenyl)-2-(p-chlorophenyl) ethane (CAS number 789-02-6; EU number 212-332-5); 1,1-dichloro-2,2 bis (p-chlorophenyl) ethylene (CAS number 72-55-9; EU number 200-784-6); and 1,1-dichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 72-54-8; EU number 200-783-0). | (v)DDT total comprises the sum of the isomers 1,1,1-trichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 50-29-3; EU number 200-024-3); 1,1,1-trichloro-2 (o-chlorophenyl)-2-(p-chlorophenyl) ethane (CAS number 789-02-6; EU number 212-332-5); 1,1-dichloro-2,2 bis (p-chlorophenyl) ethylene (CAS number 72-55-9; EU number 200-784-6); and 1,1-dichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 72-54-8; EU number 200-783-0). | (v)DDT total comprises the sum of the isomers 1,1,1-trichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 50-29-3; EU number 200-024-3); 1,1,1-trichloro-2 (o-chlorophenyl)-2-(p-chlorophenyl) ethane (CAS number 789-02-6; EU number 212-332-5); 1,1-dichloro-2,2 bis (p-chlorophenyl) ethylene (CAS number 72-55-9; EU number 200-784-6); and 1,1-dichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 72-54-8; EU number 200-783-0). |
| (vi)If the Department does not apply standards for biota it shall introduce stricter standards for water in order to achieve the same level of protection as the standards for biota set out in regulation 4. The Department shall notify the European Commission of the reasons and basis for using this approach, the alternative standards used, the data and the methodology by which the alternative standards were derived and the categories of surface water to which they would apply. | (vi)If the Department does not apply standards for biota it shall introduce stricter standards for water in order to achieve the same level of protection as the standards for biota set out in regulation 4. The Department shall notify the European Commission of the reasons and basis for using this approach, the alternative standards used, the data and the methodology by which the alternative standards were derived and the categories of surface water to which they would apply. | (vi)If the Department does not apply standards for biota it shall introduce stricter standards for water in order to achieve the same level of protection as the standards for biota set out in regulation 4. The Department shall notify the European Commission of the reasons and basis for using this approach, the alternative standards used, the data and the methodology by which the alternative standards were derived and the categories of surface water to which they would apply. | (vi)If the Department does not apply standards for biota it shall introduce stricter standards for water in order to achieve the same level of protection as the standards for biota set out in regulation 4. The Department shall notify the European Commission of the reasons and basis for using this approach, the alternative standards used, the data and the methodology by which the alternative standards were derived and the categories of surface water to which they would apply. |
| Alachlor | 15972-60-8 | 0.3 | 0.7 |
| Anthracene | 120-12-7 | 0.1 | 0.4 |
| Atrazine | 1912-24-9 | 0.6 | 2.0 |
| Benzene | 71-43-2 | 10 | 50 |
| Brominated diphenylether[^f01024] | 32534-81-9 | 0.0005 | not applicable |
| Cadmium and its compounds (depending on water hardness classes)[^f01025] | 7440-43-9 | ≤ 0.08(class 1) | ≤ 0.45(class 1) |
| Cadmium and its compounds (depending on water hardness classes)[^f01025] | 7440-43-9 | 0.08(class 2) | 0.45(class 2) |
| Cadmium and its compounds (depending on water hardness classes)[^f01025] | 7440-43-9 | 0.09(class 3) | 0.6(class 3) |
| Cadmium and its compounds (depending on water hardness classes)[^f01025] | 7440-43-9 | 0.15(class 4) | 0.9(class 4) |
| Cadmium and its compounds (depending on water hardness classes)[^f01025] | 7440-43-9 | 0.25(class 5) | 1.5(class 5) |
| Carbon-tetrachloride | 56-23-5 | 12 | not applicable |
| C10-13 Chloroalkanes | 85535-84-8 | 0.4 | 1.4 |
| Chlorfenvinphos | 470-90-6 | 0.1 | 0.3 |
| Chlorpyrifos (Chlorpyrifos-ethyl) | 2921-88-2 | 0.03 | 0.1 |
| Cyclodiene pesticides: | |||
| Aldrin | 309-00-2 | Σ=0.01 | not applicable |
| Dieldrin | 60-57-1 | Σ=0.01 | not applicable |
| Endrin | 72-20-8 | Σ=0.01 | not applicable |
| Isodrin | 465-73-6 | Σ=0.01 | not applicable |
| DDT total[^f01026] | not applicable | 0.025 | not applicable |
| Para-para-DDT | 50-29-3 | 0.01 | not applicable |
| 1,2-Dichloroethane | 107-06-2 | 10 | not applicable |
| Dichloromethane | 75-09-2 | 20 | not applicable |
| Di(2-ethylhexyl)-phthalate (DEHP) | 117-81-7 | 1.3 | not applicable |
| Diuron | 330-54-1 | 0.2 | 1.8 |
| Endosulfan | 115-29-7 | 0.005 | 0.01 |
| Fluoranthene | 206-44-0 | 0.1 | 1 |
| Hexachloro-benzene | 118-74-1 | 0.01[^f01027] | 0.05 |
| Hexachloro-butadiene | 87-68-3 | 0.1[^f01027] | 0.6 |
| Hexachloro-cyclohexane | 608-73-1 | 0.02 | 0.04 |
| Isoproturon | 34123-59-6 | 0.3 | 1.0 |
| Lead and its compounds | 7439-92-1 | 7.2 | not applicable |
| Mercury and its compounds | 7439-97-6 | 0.05[^f01027] | 0.07 |
| Naphthalene | 91-20-3 | 2.4 | not applicable |
| Nickel and its compounds | 7440-02-0 | 20 | not applicable |
| Nonylphenol (4-Nonylphenol) | 104-40-5 | 0.3 | 2.0 |
| Octylphenol ((4-(1,1’,3,3’-tetramethylbutyl)-phenol)) | 140-66-9 | 0.1 | not applicable |
| Pentachloro-benzene | 608-93-5 | 0.007 | not applicable |
| Pentachloro-phenol | 87-86-5 | 0.4 | 1 |
| Benzo(a)pyrene | 50-32-8 | 0.05 | 0.1 |
| Benzo(b)fluor-anthene | 205-99-2 | Σ=0.03 | not applicable |
| Benzo(k)fluor-anthene | 207-08-9 | Σ=0.03 | not applicable |
| Benzo(g,h,i)-perylene | 191-24-2 | Σ=0.002 | not applicable |
| Indeno(1,2,3-cd)-pyrene | 193-39-5 | Σ=0.002 | not applicable |
| Simazine | 122-34-9 | 1 | 4 |
| Tetrachloro-ethylene | 127-18-4 | 10 | not applicable |
| Trichloro-ethylene | 79-01-6 | 10 | not applicable |
| Tributyltin compounds (Tributhyltin-cation) | 36643-28-4 | 0.0002 | 0.0015 |
| Trichloro-benzenes | 12002-48-1 | 0.4 | not applicable |
| Trichloro-methane | 67-66-3 | 2.5 | not applicable |
| Trifluralin | 1582-09-8 | 0.03 | not applicable |
Application of the standards set out in Table 46
For any given surface water body, applying the AA-EQS means that, for each representative monitoring point within the water body, the arithmetic mean of the concentrations measured at different times during the year does not exceed the standard.
The calculation of the arithmetic mean, the analytical method used and, where there is no appropriate analytical method meeting the minimum performance criteria, the method of applying a standard must be in accordance with implementing acts adopting technical specifications for chemical monitoring and quality of analytical results, in accordance with the Water Framework Directive.
For any given surface water body, applying the MAC-EQS means that the measured concentration at any representative monitoring point within the water body does not exceed the standard.
However, in accordance with section 1.3.4. of Annex V to the Water Framework Directive, the Department may introduce statistical methods, such as a percentile calculation, to ensure an acceptable level of confidence and precision for determining compliance with the MAC-EQS.
With the exception of cadmium, lead, mercury and nickel (hereinafter “metals”) the standards set out in Table 46 are expressed as total concentrations in the whole water sample. In the case of metals the standards refer to the dissolved concentration i.e. the dissolved phase of a water sample obtained by filtration through a 0.45 µm filter or any equivalent pre-treatment.
The Department may, when assessing the monitoring results against the standards, take into account:
- natural background concentrations for metals and their compounds, if they prevent compliance with the standard; and
- hardness, pH or other water quality parameters that affect the bioavailability of metals.
14
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PART4 — Intermittent Discharge Standards
| Salmonid waters | Salmonid waters | Salmonid waters | Salmonid waters |
|---|---|---|---|
| Dissolved oxygen concentration (mg/l) | Dissolved oxygen concentration (mg/l) | Dissolved oxygen concentration (mg/l) | |
| Return period | 1 hour | 6 hours | 24 hours |
| 1 month | 5.0 | 5.5 | 6.0 |
| 3 months | 4.5 | 5.0 | 5.5 |
| 1 year | 4.0 | 4.5 | 5.0 |
| Cyprinid waters | Cyprinid waters | Cyprinid waters | Cyprinid waters |
| Dissolved oxygen concentration (mg/l) | Dissolved oxygen concentration (mg/l) | Dissolved oxygen concentration (mg/l) | |
| Return period | 1 hour | 6 hours | 24 hours |
| 1 month | 4.0 | 5.0 | 5.5 |
| 3 months | 3.5 | 4.5 | 5.0 |
| 1 year | 3.0 | 4.0 | 4.5 |
| The standards apply when the concurrent concentration of un-ionised ammonia concentration is below 0.02 mg/l. The following correction factors apply at higher concurrent un-ionised concentrations:Where the un-ionised ammonia lies between 0.02-0.15mg NH3-N/I: the correction factor is an addition of (0.97 x log (mg NH3-N/I) + 3.8) mg O2/l. For concentrations that exceed 0.15 mg NH3-N/I, the correction factor is +2 mg O2/litre.A correction factor of 3mg O2/l is added for salmonid spawning grounds. | The standards apply when the concurrent concentration of un-ionised ammonia concentration is below 0.02 mg/l. The following correction factors apply at higher concurrent un-ionised concentrations:Where the un-ionised ammonia lies between 0.02-0.15mg NH3-N/I: the correction factor is an addition of (0.97 x log (mg NH3-N/I) + 3.8) mg O2/l. For concentrations that exceed 0.15 mg NH3-N/I, the correction factor is +2 mg O2/litre.A correction factor of 3mg O2/l is added for salmonid spawning grounds. | The standards apply when the concurrent concentration of un-ionised ammonia concentration is below 0.02 mg/l. The following correction factors apply at higher concurrent un-ionised concentrations:Where the un-ionised ammonia lies between 0.02-0.15mg NH3-N/I: the correction factor is an addition of (0.97 x log (mg NH3-N/I) + 3.8) mg O2/l. For concentrations that exceed 0.15 mg NH3-N/I, the correction factor is +2 mg O2/litre.A correction factor of 3mg O2/l is added for salmonid spawning grounds. | The standards apply when the concurrent concentration of un-ionised ammonia concentration is below 0.02 mg/l. The following correction factors apply at higher concurrent un-ionised concentrations:Where the un-ionised ammonia lies between 0.02-0.15mg NH3-N/I: the correction factor is an addition of (0.97 x log (mg NH3-N/I) + 3.8) mg O2/l. For concentrations that exceed 0.15 mg NH3-N/I, the correction factor is +2 mg O2/litre.A correction factor of 3mg O2/l is added for salmonid spawning grounds. |
| Salmonid waters | Salmonid waters | Salmonid waters | Salmonid waters |
| --- | --- | --- | --- |
| Un-ionised Ammonia concentration (mg NH3-N/l) | Un-ionised Ammonia concentration (mg NH3-N/l) | Un-ionised Ammonia concentration (mg NH3-N/l) | |
| Return period | 1 hour | 6 hours | 24 hours |
| 1 month | 0.065 | 0.025 | 0.018 |
| 3 months | 0.095 | 0.035 | 0.025 |
| 1 year | 0.105 | 0.040 | 0.030 |
| Cyprinid waters | Cyprinid waters | Cyprinid waters | Cyprinid waters |
| Un-ionised Ammonia concentration (mg NH3-N/l) | Un-ionised Ammonia concentration (mg NH3-N/l) | Un-ionised Ammonia concentration (mg NH3-N/l) | |
| Return period | 1 hour | 6 hours | 24 hours |
| 1 month | 0.150 | 0.075 | 0.030 |
| 3 months | 0.225 | 0.125 | 0.050 |
| 1 year | 0.250 | 0.150 | 0.065 |
| The above limits apply when the concurrent concentration of dissolved oxygen is above 5 mg/l. At lower concentrations of dissolved oxygen the following correction factor applies: For dissolved oxygen less than 5mg/l DO, multiply the standard by 0.0126 and the concentration of dissolved oxygen in mg O/litre, C, raised to the power of 2.72, that is, 0.0126 C2.72.The standards also assume that the concurrent pH is greater than 7 and temperature is greater than 5 degrees Centigrade. For lower pH and temperatures the following correction factors apply: Where the pH is less than 7, multiply the standard by 0.0003 and by the value of the pH, p, raised to the power of 4.17, that is: 0.0003p4.17. Where the temperature is less than 5 degrees Centigrade, multiply this correction factor by a further 0.5. | The above limits apply when the concurrent concentration of dissolved oxygen is above 5 mg/l. At lower concentrations of dissolved oxygen the following correction factor applies: For dissolved oxygen less than 5mg/l DO, multiply the standard by 0.0126 and the concentration of dissolved oxygen in mg O/litre, C, raised to the power of 2.72, that is, 0.0126 C2.72.The standards also assume that the concurrent pH is greater than 7 and temperature is greater than 5 degrees Centigrade. For lower pH and temperatures the following correction factors apply: Where the pH is less than 7, multiply the standard by 0.0003 and by the value of the pH, p, raised to the power of 4.17, that is: 0.0003p4.17. Where the temperature is less than 5 degrees Centigrade, multiply this correction factor by a further 0.5. | The above limits apply when the concurrent concentration of dissolved oxygen is above 5 mg/l. At lower concentrations of dissolved oxygen the following correction factor applies: For dissolved oxygen less than 5mg/l DO, multiply the standard by 0.0126 and the concentration of dissolved oxygen in mg O/litre, C, raised to the power of 2.72, that is, 0.0126 C2.72.The standards also assume that the concurrent pH is greater than 7 and temperature is greater than 5 degrees Centigrade. For lower pH and temperatures the following correction factors apply: Where the pH is less than 7, multiply the standard by 0.0003 and by the value of the pH, p, raised to the power of 4.17, that is: 0.0003p4.17. Where the temperature is less than 5 degrees Centigrade, multiply this correction factor by a further 0.5. | The above limits apply when the concurrent concentration of dissolved oxygen is above 5 mg/l. At lower concentrations of dissolved oxygen the following correction factor applies: For dissolved oxygen less than 5mg/l DO, multiply the standard by 0.0126 and the concentration of dissolved oxygen in mg O/litre, C, raised to the power of 2.72, that is, 0.0126 C2.72.The standards also assume that the concurrent pH is greater than 7 and temperature is greater than 5 degrees Centigrade. For lower pH and temperatures the following correction factors apply: Where the pH is less than 7, multiply the standard by 0.0003 and by the value of the pH, p, raised to the power of 4.17, that is: 0.0003p4.17. Where the temperature is less than 5 degrees Centigrade, multiply this correction factor by a further 0.5. |
| Status | Types of river | 99th percentile BOD (mg/l) | |
| --- | --- | --- | |
| High | 1,2,4,6 and salmonid | 7.0 | |
| High | 3,5 and 7 | 9.0 | |
| Good | 1,2,4,6 and salmonid | 9.0 | |
| Good | 3,5 and 7 | 11.0 | |
| Moderate | 1,2,4,6 and salmonid | 14.0 | |
| Moderate | 3,5 and 7 | 14.0 | |
| Poor | 1,2,4,6 and salmonid | 16.0 | |
| Poor | 3,5 and 7 | 19.0 | |
| Status | Types of river | Total ammonia (mg NH4-N/l) | Un-ionised ammonia (mg NH3-N/l) |
| --- | --- | --- | --- |
| Status | Types of river | 99th percentile | 99th percentile |
| High | 1,2,4,6 and salmonid | 0.5 | 0.04 |
| High | 3,5 and 7 | 0.7 | 0.04 |
| Good | 1,2,4,6 and salmonid | 0.7 | 0.04 |
| Good | 3,5 and 7 | 1.5 | 0.04 |
| Moderate | 1,2,4,6 and salmonid | 1.8 | 0.04 |
| Moderate | 3,5 and 7 | 2.6 | 0.04 |
| Poor | 1,2,4,6 and salmonid | 2.6 | 0.04 |
| Poor | 3,5 and 7 | 6.0 | - |
| Alkalinity (as mg/l CaCO₃>) | Alkalinity (as mg/l CaCO₃>) | Alkalinity (as mg/l CaCO₃>) | Alkalinity (as mg/l CaCO₃>) |
| --- | --- | --- | --- |
| Altitude | Less than 10 | 10-50 | 50-100 |
| Under 80 metres | Type 1 | Type 2 | Type 3 |
| Over 80 metres | Type 1 | Type 2 | Type 4 |
1
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SCHEDULE5
PART1 — Shellfish Waters Standards
| Parameter | Units | Standard |
|---|---|---|
| Temperature | ◦C | A discharge affecting shellfish waters must not cause the temperature of the water to exceed by more than 2◦C the temperature of the waters not so affected. |
| pH | pH values will not reach levels outside of the range established so as to ensure the functioning of the ecosystem and the achievement of the values specified for the biological quality elements under Good Ecological Status | |
| Silver | Annual mean (AA-EQS) (µg/l) | 0.5 |
| Silver | Maximum allowable concentration (MAC-EQS) (µg/l) | 1 |
PART2 — Microbial Guideline Value
Microbial Guideline Value
1
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Compliance with the microbial guideline value
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Sampling and analysis
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