City to begin dead-end watermain flushing September 16

The City will begin dead-end watermain flushing throughout Guelph starting Monday, September 16, and will run continuously throughout the year. Flushing dead-end watermains will take place from Monday to Friday between 8 a.m. and 4 p.m.

What to expect

  • Water pressure may be low during flushing and water may appear discoloured.
  • No chemicals are used during watermain flushing.

Drinking small amounts of discoloured water is unlikely to cause health issues. However, the City recommends waiting until water runs clear before drinking it. To clear discoloured water, run a cold water tap for five to fifteen minutes.

Why we flush dead-end watermains

Dead-end watermain flushing ensures customers receive the freshest water possible. Flushing removes buildup of natural minerals such as iron and manganese. This reduces the chance that water will become discoloured.

For more information

For more information about dead-end watermain flushing, or water quality and routine maintenance, contact Water Services at 519-837-5627 or visit

Tim Spence, Supervisor Water distribution
Environmental Services, Water Services
519-822-1260 extension 2365
[email protected]