This report describes an incident of contamination of drinking water in 5 Group Water Schemes (GWSs) in County Cavan and County Monaghan.

On 19th April 2007, the HSE first became aware that the following 5 GWSs were likely to have been contaminated by a batch of tainted Aluminium Chloride (AC) - a coagulant used by Veolia Water (VW) in drinking-water treatment:
 Glaslough/Tyholland GWS Co Monaghan
 Bunnoe GWS Co Cavan
 Crosserlough GWS Co Cavan
 Dernakesh GWS Co. Cavan
 Kill GWS Co Cavan.

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