The drinking water that flows from our taps is drawn from rivers, lakes and groundwater and undergoes varying amounts of treatment to ensure that it is safe to drink. For most people who live in urban areas the water is supplied by the local authority following extensive treatment. Smaller communities use private schemes while single houses in rural areas tend to rely on groundwater wells with no water treatment at all.
The vulnerability of our surface and groundwater to pollution is reflected in the relatively high level of pollution of our drinking water supplies. In early 2007 the water supply for Galway City was contaminated by the Cryptosporidium parasite and this caused widespread illness among consumers with serious risks to some of the population. The discharge of sewage to waters and the spreading of animal manure on land are the principal risks to the quality of drinking water in Ireland. In 2009 coliform bacteria (an indicator of faecal pollution) was detected in 190 of the 944 public supplies monitored, while the private supplies were much worse with 194 of 511 supplies showing evidence of contamination.
2015 findings show that 99.92% of samples comply with microbiological parameters and 99.39% of samples comply with chemical parameters. E-coli was detected at least once in 7 supplies, down 1 from 2014. 14 supplies exceeded the limits for pesticides, up from 4 in 2014. The pesticides detected were primarily MCPA, a herbicide used to control the growth of rushes.
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