How often should I have my water tested?
Private supplies include group schemes; wells that provide water to public buildings and businesses in rural areas that do not have a public mains supply; and wells that people have drilled for their own homes.
If you operate a household well, monitoring your water quality is your own responsibility and the EPA recommends that you monitor your supply at least once a year for E. coli, preferably following heavy rain when the supply is most at risk from contamination.
If you are responsible for private supplies serving a commercial or public activity, such as a crèche, nursing home, pub, restaurant or hotel, you are required by law to take two E. coli samples per year. You should be especially vigilant as poor-quality water poses a particular health risk to vulnerable groups such as infants, young children, the elderly, and those who already have an underlying health condition.