Assessing lake water quality - EPA fact sheet

This Plain English fact sheet outlines the work done by the EPA in assessing water quality in Ireland’s lakes.


An image of the first page of the EPA fact sheet Assessing Lake Water Quality

Published: 2023

Pages: 2

Filesize: 3,826 KB

Format: pdf


Ireland has more than 12,000 lakes.

Lough Corrib is the largest lake in the Republic of Ireland and contains around 800 billion litres of water, enough to fill more than 300,000 Olympic-sized swimming pools.

Lakes and reservoirs are the main source of drinking water for two million people in Ireland.

The water quality of 812 lakes is currently assessed by the EPA. This covers 90% of the surface area of all lakes in Ireland.

This includes:

  • lakes greater than 50 hectares;
  • lakes that are used for supplying drinking water; and
  • lakes that are of regional, local or scientific interest.