The Town of Newmarket is asking some residents to not use their water for certain days between July 21 and Aug. 16.

The town is conducting its annual water main cleaning program in order to continue to provide safe, high-quality water in Newmarket. The work is scheduled to take place from July 21 to Aug. 16 from 10 p.m. to 6 a.m. in Wards 2, 3 and 5.

The water mains will be cleaned via swabbing — a process considered one of the most effective water distribution system maintenance procedures. It is completed by cleaning several of the water mains that, over time, have built up sediment. The annual procedure helps reduce the effects of water degradation.

A foam sponge, or ‘swab,’ will be inserted into the water main through a fire hydrant. The swab is slightly larger than the diameter of the water main, and as it is pushed through with water pressure, it will clear any sediment and push it up and out another fire hydrant.