Water & Wastewater

The Town of St. Marys is committed to providing safe, clean and reliable drinking water to all the residents and businesses within the Town. The Ontario Clean Water Agency (OCWA) operates and maintains the Town's water and wastewater systems.

Water & Wastewater Rates

Information regarding water and wastewater rates.

Water Testing & Quality

Learn more about how the Town of St. Marys is committed to providing safe, clean and reliable drinking water to all the residents and businesses.

Water Leak Forgiveness

Learn how the Town of St. Marys provides a transparent framework for addressing water bill adjustments caused by severe or unexpected usage from leaks.

Wastewater Collection & Treatment

Learn about the sanitary collection system, wastewater treatment plant and annual reports

Stormwater Management

Learn about proper stormwater management in the Town of St. Marys.

Fall Flushing

The Town of St. Marys will be performing fall water main and hydrant flushing from October 5 - 30, 2026.

Flushing Schedule

October 5 - 9 | 7AM - 5PM | Area North of Trout Creek and East of the Thames River
October 13 - 16 | 7AM - 5PM | Area West of the Thames River
October 18 | 6PM - 12AM | Queen St. E (Downtown Core)
October 19 - 23 | 7AM - 5PM | Area South of Trout Creek from the Thames River to James Street, including James Street South
October 26 - 30 | 7AM - 5PM | Area South of Trout Creek and East of James Street

Potential Service Disruptions

You may observe some water discolouration during flushing. If you experience discolouration, run cold water until it becomes clear. If your water does not run clear after five minutes, turn off the tap and wait 30 minutes before trying again. You should refrain from doing laundry until any discolouration has cleared.

Flushing Map

Town of St. Marys
Dave Blake | Environmental Services Supervisor
519-284-2340, ext. 209

Ontario Clean Water Agency
519-318-3406