Cowansville Water Hardness & Quality Report (2026)

Cowansville's drinking water is managed by the Ville de Cowansville, drawing from the Yamaska River — Cowansville is a city in the Brome-Missisquoi regional county of the Estrie region of Quebec in the Eastern Townships, on the Yamaska River at the base of the Sutton Mountains, a bilingual French-English heritage industrial city in the former textile and manufacturing belt of the Townships, home to the historic Cowansville Cotton Mill heritage buildings and the Brome-Missisquoi agricultural produce market, a community at the heart of the Appalachian foothills south of the Bromont ski resort. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 125 mg/L (7.3 gpg) — classified as hard by Health Canada, consistent with the Yamaska River carbonate terrain in Brome-Missisquoi.

Cowansville draws from the Yamaska River in the Brome-Missisquoi valley — the Yamaska River drains the Eastern Townships Appalachian foothills including the Sutton Mountains, where Ordovician and Cambrian carbonate rocks produce moderately hard to hard dissolution. The 125 mg/L is essentially the same as the adjacent Farnham sub-zone (121.5 mg/L from batch 34) in the same regional county on the same Yamaska River, confirming the consistent Yamaska River Brome-Missisquoi supply character throughout the region. Water quality reports are published under Ministère de l'Environnement oversight.

At 125 mg/L, Cowansville homes experience moderate scale deposits — monthly kettle and showerhead cleaning is typical. Hot water tanks benefit from periodic inspection. Health Canada lead precautionary guidance applies to pre-1975 properties in the historic Cowansville textile-era residential district.