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.
2016 findings show that 99.9% of samples comply with microbiological parameters and 99.5% of samples comply with chemical parameters.
- Over 99.9% of samples were free from E-coli.
- Cryptosporidium was detected in 24 supplies leaving 163,809 people on the Remedial Action List due to the risk from Cryptosporidium at the end of 2016.
- 55 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.
- 4,000 fewer people on boil notices at end 2016, compared to end 2015.
- 97.8% of samples complied with the standard of 10µg/l of lead.
- Trihalomethane (THM - by products of the chlorination process) levels were complied with in 92% of supplies.
- In 2016, 21 samples (18 supplies) failed the national standard of 0.8 mg/l for Fluoride.
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