Several pesticide exceedances have been detected in public drinking water supplies across Cavan and Monaghan.
These exceedances were detected as part of Irish Water's public water supply monitoring programme.
In Co Cavan, four exceedances of the pesticide MCPA were detected in Arvagh, Belturbet and Gowna last year.
MCPA is still the most commonly detected pesticide in drinking water sources and is present in most herbicide products used to control thistles, docks and rushes.
Meanwhile in Co Monaghan, three exceedances of the pesticide 2,4-D and MCPA were detected in Emyvale, Glaslough and the Lough Egish Regional Water Supply Scheme.
Irish Water is asking users of any herbicide or pesticide products to consider the vulnerability of their local drinking water supplies to pesticide contamination, and the importance of these supplies to the local community.
While the levels detected do not represent a threat to public health, Irish Water says it is "still undesirable in drinking water".
