The Environmental Protection Agency's annual report says continuing risks to public health in private drinking water supplies are not being tackled.
One private drinking-water supply in the midlands, along with 16 more nationally, has been found to have had E.Coli.
A supply in Ballyfore, Offaly was contaminated with the harmful bacteria.
The Environmental Protection Agency's annual report says continuing risks to public health in private drinking water supplies are not being tackled.
One quarter of 1,700 small private supplies that serve food businesses, nursing homes, crèches and B&Bs were not being monitored according to the report.
Programme manager with the EPA, Noel Byrne, says suppliers should be using the funding available to address infrastructural needs.
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