Ottawa Water Restrictions 2026

Ottawa draws drinking water from the Ottawa River through the Britannia and Lemieux Island Water Purification Plants — a high-volume surface source that is rarely the binding constraint on summer supply. Distribution-system pressure during peak summer demand is the more typical pressure point, and the City has so far managed peak demand through voluntary messaging rather than mandatory restrictions. The Mississippi Valley Conservation Authority and Rideau Valley Conservation Authority monitor inland tributaries (the Mississippi, Rideau, and Carp rivers) under the Ontario Low Water Response Program. As of late April 2026 both authorities reported normal stream-flow status. A Level 1 advisory would trigger voluntary 10% reductions; Level 2 would trigger mandatory restrictions city-wide. Gatineau, across the Ottawa River in Quebec, operates an entirely separate Quebec-side outdoor watering by-law. Residents in the National Capital Region who own properties on both sides of the river follow each city's rules independently.