Public water supplies

Northern Ireland Water is the public water supplier in Northern Ireland. The DWI investigates incidences where drinking water quality standards have been breached or compromised and also carries out an annual assessment of Northern Ireland Water.

Failing to meet standards

If Northern Ireland Water fails to meet the required standards, the DWI may take enforcement action as detailed in their prosecution policy:-

You can view Undertakings, agreed between NI Water and the Chief Inspector of Drinking Water, following enforcement action taken under Section 31(3)(a) of the Water Sewerage Services (Northern Ireland) Order 2006. Current and historical documents can be viewed using the links below:

You can view current and historical reports on the compliance with the drinking water quality standards using the link below:-

You can view the legislation relating to the standards required of the public water supply at the links below:-

Domestic distribution regulations

DWI has regulatory responsibilities for drinking water quality supplied via a domestic distribution relating to the supply of water to the public in premises such as schools, hospitals and restaurants under The Water Supply (Domestic Distribution Systems) Regulations (Northern Ireland) 2010.

Information Letters

Information letters are used to notify the water industry and relevant stakeholders of any changes in regulatory matters, guidance or procedures.


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