There were four boil water notices served on water supply schemes in Tipperary in 2016, according to a report issued this Tuesday by the Environmental Protection Agency.
The report, which focuses on private water supplies, shows that 20 per cent of the population depend on such schemes.
There are 39 private water schemes in the county serving a population of 8,439, with a further 122 small private water schemes serving 3,490 people.
The boil water notices affected 588 people, according to the report.
A total of 39 audits were carried out on schemes in Tipperary in 2016.
The reports states that, nationally, the water quality in private schemes was not as good as in public supplies and that small private schemes and household wells tend to have poorer quality water supply than public group schemes.
It says this is a cause for concern as poor quality supply can lead to illnes.
The EPA report shows that almost 100 per cent of public group water schemes were Ecoli compliant in the entire country, with only one exceeding the limits. Ecoli shows the presence of human or animal waste in the water supply.
However, in the private schemes, 22 samples showed Ecoli present, while in the small private schemes, 69 had Ecoli.
Both the private group schemes and the small scheme had high levels of coliform bacteria in samples taken, with 229 small schemes having coliform bacteria and 67 private schemes have coliform bacteria.
The report recommends that all water schemes supplying more than 50 people should be monitored twice a year and that all small schemes should be monitored at least once a year for Ecoli.