The dangerous bacteria E coli, which can cause kidney failure, was found in 62 private water supplies in 2018.
7 of the 26 such supplies in Kildare were not monitored for the presence of the bacteria.
A new report from the Environmental Protection Agency found more than 1,000 people, nationwide, got a serious infection as a result of E. coli.
The watchdog is warning water quality in private sources is poorer than in public supplies.
The EPA says poorly constructed wells are putting health at risk.
In Kildare, there are a total of 26 private water supplies, covering a population of 3,965 people.
Kildare County Council audited 4 of those supplies in 2018, and no directions were issued as a result.
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