S.I. No. 419/1994 - Environment Protection Agency Act, 1992 (Urban Waste Water Treatment) Regulations, 1994

The Minister for the Environment, in exercise of the powers conferred on him by section 59 of the Environment Protection Agency Act, 1992 (No. 7 of 1992) and for the purpose of giving effect to the Council Directive of 21st May, 1991 (No. 91/271/EEC*), hereby makes the following Regulations:

1.

2.

any reference to an article or Schedule which is not otherwise identified is a reference to an article or Schedule of these Regulations;

any reference to a sub-article which is not otherwise identified is a reference to a sub-article of the provision in which the reference occurs;

"agglomeration" means an area where the population and/or economic activities are sufficiently concentrated for urban waste water to be collected and conducted to an urban waste water treatment plant or to a final discharge point;

"appropriate treatment" means treatment of urban waste water by any process and/or disposal system which after discharge allows the receiving waters to meet the relevant quality objectives and the relevant provisions of the Directive and of other Community Directives;

"coastal waters" means the waters outside the low-water line or the outer limit of an estuary;

"collecting system" means a system of conduits which collects and conducts urban waste water;

*O.J No. L135/40, 30th May, 1991.

"domestic waste water" means waste water from residential settlements and services which originates predominantly from the human metabolism and from household activities;

"estuary" means the transitional area at the mouth of a river between freshwater and coastal waters;

" eutrophication" means the enrichment of water by nutrients, especially compounds of nitrogen and/or phosphorus, causing an accelerated growth of algae and higher forms of plant life to produce an undesirable disturbance to the balance of organisms present in the water and to the quality of the water concerned;

"industrial waste water" means any waste water which is discharged from premises used for carrying on any trade or industry, other than domestic waste water and run-off rain water;

"population equivalent" is a measurement of organic biodegradable load and a population equivalent of 1 (1 p.e.) means the organic biodegradable load having a five-day biochemical oxygen demand (BOD5) of 60g of oxygen per day — the load shall be calculated on the basis of the maximum average weekly load entering the treatment plant during the year, excluding unusual situations such as those due to heavy rain;

"secondary treatment" means treatment of urban waste water by a process generally involving biological treatment with a secondary settlement or other process in which the requirements established in Part 1 of the Second Schedule are respected;

"sensitive areas" means those areas specified in the Third Schedule and such other areas as may be identified pursuant to Article 5 of the Directive;

"sludge" means residual sludge, whether treated or untreated, from urban waste water treatment plants;

"the Directive" means Council Directive 91/271/EEC of 21st May, 1991 concerning urban waste water treatment, and references to other Community Directives are references to Directives other than Council Directive 91/271/EEC;

"urban waste water" means domestic waste water or the mixture of domestic waste water with industrial waste water and/or run-off rain water.

3.

( a ) by 31st December, 1998 for every agglomerations with a population equivalent of more than 10,000 which discharges into any of the sensitive areas specified in the Third Schedule or into the relevant catchment areas of such sensitive areas,

( b ) by 31st December, 2000 for every agglomeration with a population equivalent of more than 15,000,

( c ) by 31st December, 2005 for every agglomeration with a population equivalent between 2,000 and 15,000.

• (2) A collecting system required under sub-article (1) shall satisfy the requirements of the First Schedule.

• (3) Sub-article (1) shall not apply where the provision of a collecting system is not justified either because it would produce no environmental benefit or because it would involve excessive cost, provided that the sanitary authority is satisfied that individual systems or other appropriate systems are used which achieve the same level of environmental protection.

4.

( a ) by 31st December, 2000, or such later date, not being later than 31st December, 2005, as the European Commission may agree pursuant to a request under Article 8 of the Directive, in respect of all discharges from agglomerations with a population equivalent of more than 15,000,

( b ) by 31st December, 2005 in respect of all discharges from agglomerations with a population equivalent of between 10,000 and 15,000,

( c ) by 31st December, 2005 in respect of all discharges to freshwaters and estuaries from agglomerations with a population equivalent of between 2,000 and 10,000.

• (2) Notwithstanding sub-article (1) and subject to sub-article (3) and (4), a sanitary authority shall provide, by 31st December, 1988, treatment plants which provide more stringent treatment than secondary treatment or an equivalent treatment in respect of all discharges from agglomerations with a population equivalent of more than 10,000 into sensitive areas or into the relevant catchment areas of sensitive areas where the discharges contribute to the population of these areas.

• (3) Subject to sub-article (4), a discharge from a treatment plant required under sub-article (2) shall satisfy the requirements of Parts I and II of the Second Schedule.

• (4) Sub-articles (2) and (3) shall not apply in respect of individual treatment plants where the sanitary authority is satisfied that the minimum percentage of reduction of the overall load entering all urban waste water treatment plants in a sensitive area is at least 75 per cent for total phosphorus and for total nitrogen.

5.

6.

• (2) Where, following a review of the identification of waters as sensitive areas pursuant to Article 5 of the Directive, the Minister identifies an area other than those in the Third Schedule as a sensitive area, then, as respects that area, the requirements of article 4 and article 5, as appropriate, shall be met not later than 7 years from the date such an area becomes identified as a sensitive area.

7.

( a ) in respect of discharges to freshwater and estuaries from agglomerations with a population equivalent of less than 2,000;

( b ) in respect of discharges to coastal waters from agglomerations with a population equivalent of less than 10,000.

8.

• (2) Seasonal variations of the load shall be taken into account when designing a treatment plant.

• (3) A treatment plant shall be so designed or modified that representative samples can be obtained of the incoming waste water and of treated effluent before discharge to receiving waters.

• (4) A point of discharge of urban waste water shall be so chosen as to minimise the adverse effects on the receiving environment.

9.

10.

( a ) discharges from urban waste water treatment plants in accordance with the procedures set out in the Fifth Schedule in order to verify compliance with the requirements of these Regulations, as appropriate, and

( b ) waters subject to a discharge from an urban waste water treatment plant where it can be expected that the receiving waters will be significantly affected.

• (2) The results of monitoring carried out under this article shall be transmitted to the Agency in such manner and at such times as the Agency shall direct.

FIRST SCHEDULE

Collecting systems

A collecting system shall take into account waste water treatment requirements.

The design, construction and maintenance of a collecting system shall be undertaken in accordance with the best technical knowledge not entailing excessive costs, notably regarding;

— volume and characteristics of urban waste water,

— prevention of leaks,

— limitation of pollution of receiving waters due to storm water overflows.

SECOND SCHEDULE

Part I

The values for concentrations or for the percentage of reduction shall apply.

^(1) Reduction in relation to the load of the influent.

^(2)The parameter can be replaced by another parameter: total organic carbon (TOC) or total oxygen demand (TOD) if a relationship can be established between BOD5 and the substitute parameter.

^(1) Reduction in relation to the load of the influent.

Part II

Requirements for discharges from urban waste water treatment plants to sensitive areas which are subject to eutrophication. One or both parameters may be applied depending on the local situation. The values for concentration or for the percentage of reduction shall apply.

^(1) Reduction in relation to the load of the influent.

^(2)Total nitrogen means: the sum of total Kjeldahl-nitrogen (organic N + NH3), nitrate (NO3) — nitrogen and nitrite (NO2) — nitrogen.

THIRD SCHEDULE

Sensitive Areas

River Boyne, County Meath — 6.5 km section downstream of sewage treatment works outfall at Blackcastle, Navan, County Meath.

River Camlin, County Longford — from sewage treatment works at Longford to entry into the River Shannon.

River Castlebar, County Mayo — downstream of sewage treatment works outfall at Knockthomas to entry into Lough Cullin.

River Liffey — downstream of Osberstown sewage treatment works to Leixlip reservoir, County Kildare.

River Nenagh, County Tipperary — downstream of sewage treatment works outfall in Nenagh to entry into Lough Derg.

River Tullamore, County Offaly — 0.5 km section downstream of sewage treatment works outfall in Tullamore.

Lough Derg on the River Shannon.

Lough Leane, County Kerry.

Lough Oughter, County Cavan.

Lough Ree on the River Shannon.

FOURTH SCHEDULE

Industrial Waste Water

Industrial waste water entering collecting systems and urban waste water treatment plants shall be subject to such pretreatment as is required in order to:

— protect the health of staff working in collecting systems and treatment plants;

— ensure that collecting systems, waste water treatment plants and associated equipment are not damaged;

— ensure that the operation of a waste water treatment plant and the treatment of sludge are not impeded;

— ensure that discharges from treatment plants do not adversely affect the environment or prevent receiving waters from complying with other Community Directives;

— ensure that sludge can be disposed of safely in an environmentally acceptable manner.

FIFTH SCHEDULE

Reference methods for monitoring and evaluation of results

Alternative methods to those mentioned in paragraphs 2, 3 and 4 may be used provided that it can be demonstrated that equivalent results are obtained.

Good international laboratory practices aiming at minimising the degradation of samples between collection and analysis shall be applied.

• (a) for the parameters specified in Part 1 of the Second Schedule, a maximum number of samples which are allowed to fail the requirements, expressed in concentrations and/or percentage reductions in Part 1 of the Second Schedule, is set out in the Table to this Schedule;

• (b) for the parameters in Part I of the Second Schedule expressed in concentrations, the failing samples taken under normal operating conditions must not deviate from the parametric values by more than 100 per cent but, for the parametric value in concentration relating to total suspended solids, deviations of up to 150 per cent may be accepted;

• (c) for those parameters specified in Part II of the Second Schedule the annual mean of the samples for each parameter shall conform to the relevant parametric values.

TABLE

GIVEN under the Official Seal of the Minister for the Environment, this

14th day of December, 1994.

MICHAEL SMITH,

Minister for the Environment.

EXPLANATORY NOTE.

These Regulations prescribe requirements in relation to the provision of collecting systems and treatment standards and other requirements for urban waste water treatment plants, generally and in sensitive areas. The Regulations identify 10 water bodies as sensitive areas. The Regulations also provide for monitoring procedures in relation to treatment plants and make provision for pre-treatment requirements in relation to industrial waste water treatment plants.

These Regulations give effect to provisions of Council Directive No. 91/271/EEC of 21st May, 1991 concerning urban waste water treatment.