Our Wastewater Treatment Plant Network

Irish Water operates a network of wastewater treatment plants across Ireland and has responsibility for operating and maintaining the public sewer network. These treatment plants vary in size according to the population of the area they serve. Despite the variation in size, the processes used to treat wastewater are generally the same.

Irish Water Wastewater Treatment Plants

Wastewater Discharge Authorisation

All Wastewater discharges (WWD) from areas served by Irish Water sewer networks and discharging to the environment requires a wastewater discharge licence or certificate of authorisation from the EPA. There are stringent conditions attached to wastewater discharge licences to ensure the treated effluent is of good quality and does not negatively impact on the environment.

Licenced Wastewater Treatment 

View the list of EPA Licenced Waste Water treatment areas by county.

Licences and Reports

To search for Wastewater Discharge Licences (WWDL), Certificate of Authorisations (CoAs), historical Annual Environmental Reports (up to 2017), EPA audit reports and associated application relating to the WWDL, visit the EPA website. A step by step guide to help you find the relevant licence and documentation is available at WWD Access Guide

Annual Environmental Reports (AERs)

2018 Annual Environmental Reports (AERs) for licensed agglomerations that are on the EPA’s Priority Areas List can be found on our AERs page. AERs provide a concise summary of compliance information for the year being reported upon. AERs are not required for CoAs. If you have a query about an AER you can contact Irish Water using the form below.

View 2018 AERs

Bathing Water Quality

For information on the bathing water quality of Ireland's beaches, visit www.beaches.ie.

Receiving Water Quality

Receiving water is a stream, river, lake, sea or other surface or groundwater source into which treated or untreated wastewater is discharged. For infomation on receiving water quality, visit the EPA website.

Need to report an issue?

To report a wastewater treatment plant issue or emergency, call our customer care helpline on 1850 278 278. Our lines are open 24/7.

Contact Us



Please use this form if you wish to make a request for Compliance Monitoring Data (Influent, Effluent and ambient monitoring data).

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