All public water schemes in Co Mayo are compliant with EU and national water standards following the removal of two schemes by the Environmental Protection Agency from the Remedial Action List.

The RAL is updated quarterly by the EPA for those water supplies where investment in treatment processes is required.

Irish Water has a prioritised programme of investment for all schemes on the RAL.

In the most recent update both Kiltimagh and Inishturk were removed from the RAL meaning there are no Mayo schemes on the EPA’s to-do list.

The Kiltimagh water treatment works underwent an upgrade to the disinfection system while the water treatment processes were optimised to secure its removal.

On Inishturk, the public water supply was on the RAL for high levels of THMs. THMs are chemicals formed by the reaction of naturally occurring dissolved organic material and chlorine which is used for disinfection in order to protect against pathogenic bacteria. A programme of works have been completed on the island to bring the supply back into compliance.