Gloucester Water Hardness & Quality Report (2026)

The City of Ottawa Water Services Branch supplies water to Gloucester, formerly a city in its own right, now part of the City of Ottawa, Ontario, Canada. This supply is drawn directly from the Ottawa River. Water is processed at the Lemieux Island and Britannia water treatment plants before being distributed to residents. The system relies solely on this surface water source, with no use of dedicated reservoirs or groundwater aquifers. This infrastructure serves a vast population of over one million people across Ottawa, encompassing both the urban core and surrounding suburban areas like Gloucester, located within what was formerly Carleton County.

The Ottawa River watershed itself is a complex geological tapestry, originating in the Canadian Shield's ancient Precambrian rocks and flowing through the Ottawa Valley's Paleozoic sedimentary basins. These basins contain formations of limestone and dolostone. Overlying much of this are glacial deposits and relatively thin soils. This geological makeup, particularly the predominantly siliceous nature of the Canadian Shield's bedrock and dilution effects, limits the dissolution of minerals like calcium and magnesium. While some limestone is present, its influence on water hardness is moderated, contributing to a naturally low-mineral content even before treatment.

Because the water is naturally very soft, homeowners in Gloucester are unlikely to encounter significant scale buildup in appliances such as kettles, water heaters, or dishwashers. This softness generally means that washing machines and other water-using devices can operate efficiently without hardness-related issues. A water softener isn't typically necessary or recommended for this supply. Instead, residents might want to be mindful of potential corrosion, a common characteristic of soft water. Utilizing protective anode rods in water heaters and, if desired, adding occasional mineral supplements can be beneficial. The treated water is maintained at a pH between 7.5 and 8.5, and recent monitoring shows compliance with Health Canada guidelines for lead and copper, with no significant PFAS detections.