Galway city council has suspended deliveries of water to areas of the city affected by lead contamination after it emerged that the deliveries themselves were also contaminated.
The City Council said emergency street taps installed this week in Old Mervue containted over four times the acceptable level of lead.
The results of further tests will be known on Monday.
The council is arranging for safe drinking water to be delivered from containers.
The Fine Gael Mayor of Galway Cllr Padraig Conneely has called on Minister for Environment John Gormley to appoint a senior official from his department to manage water supplies in the city.
Galway City Council confirmed this week that Old Mervue is the only area of the city were lead is present in distribution pipework, and residents have been advised not to drink or to boil their water.