Waste Water Treatment Plants & Discharge Licences

Waste water treatment is a process of sanitising waste water and household sewage by removing contaminants.

The goal of waste water treatment is to produce environmentally safe, treated effluent and solid waste (known as treated sludge), which can be safely disposed of or reused as fertiliser. This is achieved through a range of physical, chemical and biological processes.


Waste Water Discharge Licencing

A Waste Water Works is defined in the Regulations as 'sewers and their accessories (or any part thereof) and all other associated structural devices, including waste water treatment plants, which are owned by, vested in, controlled or used by a water services authority for the collection, storage, treatment or discharge of waste water'.

Under the Waste Water Discharge (Authorisation) Regulations 2007 (S.I. No. 684 of 2007) local authorities are required to apply to the Environment Protection Agency (EPA) for authorisation of all discharges from their waste water works to all waters. 

The relevant licence application, discharge licence granted by the EPA and Annual Envionmental Return (AER), can be viewed from the EPA website. Click here.

Limerick City and County Council has applied for authorisations from the EPA in accordance with the regulations for sewerage schemes under their control.

For further details, please contact:

Water Services Section
Limerick City and County Council
Dooradoyle
Co. Limerick

Phone: +353 61 556326 or the appropriate area office.

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Educational Site Visits

Site visits to Castletroy Waste Water Treatment Plant can be arranged for educational purposes.
Contact the Annacotty area office for further details.
Phone: +353 61 331544

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The EPA Report

Focus on Urban Waste Water Discharges in Ireland

The focus of this report is on the new licencing and enforcement systems. It covers only the cities, towns and villages requiring such licences. While the report deals with agglomerations over 500 p.e. many of the recommendations in the report may also apply to smaller agglomerations and treatment plants.

The report provides information on the level of treatment of wastewater and the quality of discharges in the period 2008 to 2010. It also investigates the performance of the water services authorities with the requirements of the WWDL's issued in this period.

The report and the appendices to the report is available to view in the supporting documents below.

The relevant licence application, discharge licence granted by the EPA and Annual Envionmental Return (AER), can be viewed from the EPA website. Click here.

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This service is provided by

Water Services Department

Phone +353 61 556000