North Roscommon Water Treatment Plant which also supplies water to some customers in South Sligo.

There was good news for over 8,500 water consumers in Co Roscommon this week with the announcement by the Environmental Protection Agency (EPA) that the North Roscommon water supply was being removed from their Remedial Action List (RAL). This means that there is only one remaining Roscommon scheme on the RAL, the Grangemore supply, following news last year that the North East Roscommon and Ballinlough water supplies were also removed in early 2018.


The Grangemore and North Roscommon schemes, which collectively supply water to over 10,000 people, have periodically recorded elevated THM levels above the standard in the Drinking Water Regulations. THMs, or Trihalomethanes 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.

Investment in upgrades

Irish Water has invested €2.9 million on upgrades to the North Roscommon Water Treatment Plant which also supplies water to some customers in South Sligo and which has improved drinking water for approximately 6,500 people. These essential upgrade works were completed towards the end of 2018 to improve drinking water quality and safeguard water supply for residents and businesses across the North Roscommon regional water supply scheme. Taste and odour issues have been addressed and the risk of contamination by cryptosporidium has been reduced even further as a result of this upgrade.

Irish Water is investing €2.4 million to extend the Boyle Water Supply Scheme to Grangemore which will improve water quality and security of supply to customers in this area. Grangemore is currently served by the existing Cavetown Water Treatment Plant which is listed on the RAL THM exceedances. It has also been subject to a boil water notice in the past.

This extension will lead to the decommissioning of the Cavetown Water Treatment Plant and is scheduled for completion in December 2019.

About the RAL

Speaking about the RAL and the ongoing work in Roscommon, Irish Water’s Regional Compliance Specialist Dr Pat O’Sullivan said: “The publication of the latest RAL update is a confirmation of the focus and dedication of Irish Water and Roscommon County Council in ensuring the delivery of clean and wholesome water in the county.

“As a single utility Irish Water is able to conduct a comprehensive evaluation of the performance of Ireland’s drinking water production plants and where serious compliance challenges are found they can be tackled more effectively and efficiently. The decommissioning of smaller water treatment plants and rationalisation of water supply zones across county boundaries as has happened in Roscommon could only be achieved by a single utility.” 

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.



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