Overnight watermain cleaning scheduled in Newcastle May 4–29, Durham Region says

Durham Region says it will clean watermains in Newcastle overnight from May 4 to May 29, 2026, as part of regular maintenance of its water supply system. The region has hired IQ Environmental to do the work, which is scheduled each night from 10 p.m. to 5 a.m.

The overnight work may affect how residents use water during those hours. Durham Region says using water while cleaning is underway could draw material into a home’s internal plumbing and cause a blockage.

Durham Region says residents will receive a hand-delivered notice 24 to 48 hours before cleaning starts on their street.

During the cleaning period, Durham Region says residents should close the shut-off valve at the water meter so water is not drawn into the home until the cleaning is finished. If that isn’t possible, the region says residents should not use water for any purpose between 10 p.m. and 5 a.m.

Durham Region lists examples of water use to avoid during the overnight work, including flushing toilets, using furnace-mounted humidifiers, and backwashing water softeners.

Once cleaning is complete, Durham Region says residents should turn on a cold water tap only and let it run for approximately five minutes before using hot water.

Durham Region says residents should keep a supply of water on hand for drinking, cooking and general purposes during the cleaning period.