Up to 400 households in Ballynanty in Limerick city have been advised by Irish Water that they should not drink the water from the public water supply in the area.
In a letter to households in Ballynanty, Irish Water states that recent testing has shown lead levels above the statutory limit for lead in drinking water.
Irish Water added that they have requested additional advice from the HSE in relation to risks posed by the possibility of elevated lead levels in the water.
As a precautionary measure the HSE advice is not to drink the water or use it for preparing food or diluted drinks including baby formula feeds or ice cubes.
The HSE also emphasise that pregnant women and young children in particular should not drink the water.
A number of drinking water standpipes have been made available in the area by Irish water and Limerick City and County Council.
Residents in the area today expressed frustration at the measures because of the burden it places on the residents and the elderly.
The HSE has also confirmed that water restriction in place on the Kildysart Public Water Supply scheme will remain in place until at least Tuesday 5 August.
Approximately 1,500 customers were advised on Tuesday 29 July that the water was unsuitable for drinking due to discolouration caused by increased manganese levels.
A Clare County Council spokesperson said: "At this stage the water quality has improved because of the ongoing modifications to the water treatment process.
"The general quality of the water is not yet at a satisfactory level and following consultation with the HSE it is advised that the water is not suitable for drinking until further notice."
Water tankers will be available at Kildysart Secondary School from 10am - 11am and 6pm - 7pm daily, and at the Hilltop Bar in Coolmeen from 12pm- 1pm and 8pm - 9pm daily.