Windsor Water Hardness & Quality Report (2026)

ENWIN Utilities Ltd. supplies water to the City of Windsor, Ontario, Canada, serving about 220,000 people in Essex County. Their sole water source is the Detroit River, with raw water drawn near Peche Island and processed at the J. Clark Keith Water Treatment Plant. This facility, capable of treating 450 million litres daily, uses conventional methods like screening, coagulation, flocculation, sedimentation, filtration, and disinfection with chlorine and ammonia. The Detroit River watershed, which spans Ontario and Michigan, connects Lake St. Clair to Lake Erie. The system doesn't utilize groundwater or reservoirs, focusing on the urban core and nearby suburbs.

Geological influences on Windsor's water stem from the region's Paleozoic bedrock. Specifically, Devonian dolomitic limestones from the Detroit River Group, including the Lucas Formation and Amherstburg Member, underlie the riverbed and surrounding areas. As water flows over these limestone-rich substrates and through related aquifers, it naturally picks up calcium and magnesium ions. This dissolution process from the bedrock's carbonate composition results in a moderately mineralized water supply, characteristic of regions with limestone geology, unlike the softer waters found in granitic terrains.

Homeowners often notice scale buildup in appliances that heat water, such as water heaters, dishwashers, and kettles. This mineral deposit can reduce their efficiency and shorten their lifespan. You might also see limescale rings on faucets and in toilets, and you'll likely need more detergent for laundry and dishes. To manage this, consider descaling fixtures monthly with vinegar, installing scale-inhibiting filters on appliances, and periodically flushing your water heater. For persistent issues, a water softener is a good investment to prevent plumbing wear and energy waste. Windsor's treated water, typically with a pH between 7.5 and 8.0, meets all provincial drinking water standards, with corrosion control measures in place to manage lead and copper levels of naturally occurring minerals like barium and uranium remaining compliant.