PORTSMOUTH, N.H. (AP) — Portsmouth city officials are asking residents to reduce the amount of water they use as demand soars during a heat wave.

The city says extreme heat is straining the city water system, despite significant rainfall in past weeks. The Portsmouth Herald reports Deputy Public Works Director Brian Goetz says on a typical day, customers use over 4 million gallons of water.

Goetz says the number jumps up to above 5 million during temperature spikes. Officials are asking people to reduce landscape watering and use of water outdoors during the day to reduce evaporation risks.

The 2014 closure of a polluted well at Pease International Tradeport has also placed strains on the city water system.

___

Information from: Portsmouth Herald, http://www.seacoastonline.com