Up to 2,000 homes were left without water for 48-hours during the hot weather.
Scores of households in Telford, Shropshire, had no water supply after Severn Trent Water reported a fault at one of its reservoirs.
The company has apologised for the temporary drought.
We had enough water in the kettle to make a drink this morning but we haven’t been able to have a wash or shower this morning so we’re all quite smelly."
Shaun Davies, leader of Telford & Wrekin Council, who has a young family and lives in Dawley, said: "Our water is off at the moment as well.
"Severn Trent has now agreed to distribute water to vulnerable customers and the council has opened leisure centres and some schools for people to access water.
Lessons need to be learned."
Severn Trent said it had discovered an issue at one of the service reservoirs, which may have caused issues in the Whitchurch area.
Report The firm said teams of engineers had been out clearing air locks from the network to get the water moving again.
Report Water supply was restored for residents of Much Wenlock by Wednesday morning.