Local authorities in Meath, Kildare, south Dublin, Carlow and North and South Tipperary are monitoring water supplies for traces of urea and ammonia following the treatment of road surfaces with the materials in recent days.
Due to a shortage of salt, urea was used in gritting mixes by the local authorities as a substitute.
Concern has now been expressed about the potential impact of the chemicals on water sources.
However, the Government's Emergency Response Co-ordination Committee today said no traces of the chemicals have yet been found.
Minister Dempsey said the materials were used as a last resort to ensure roads and motorways were safe to travel on.
Areas throughout the country are still experiencing disruptions to water supplies following the recent severe weather.
Cork City Council says demand for water is still quite high.
In Dublin, local councillor Cllr Paul McAuliffe said people in the Finglas East and Finglas West area are now enduring their fifth day without water.
Kilkenny County Council says there will be disruption to services in some areas in the south of the county and the New Ross area.
Clare County Council says demand for water has increased by 20%, with the county's water production facilities at or near capacity.
Shannon will have its water supply turned off today from 8pm-8am. Static standpipes are providing water in Ennis, north Clare and west Clare.
