Maintenance on water mains in Raymond, Standish and Scarborough is scheduled to begin next week.

Crews will be working on weekdays from 7:30 a.m. to 4 p.m., starting next Monday, according to a press release from the Portland Water District.

Once that work is completed in May, the crews will start working overnight, from 8 p.m. to 6 a.m., Sunday through Thursday in Gorham, Cumberland, Portland and Scarborough, the press release said.

The Portland Water District plans to post the location of crews on its website, www.pwd.org.

The crews will be cleaning the mains with water flowing in the opposite direction of the natural flow. Sediment in the mains will be released out hydrants.

The water district asks customers who notice a change in the quality of their water to call 761-8310.