Farnham Water Hardness & Quality Report (2026)

Farnham's drinking water is managed by the Ville de Farnham, drawing from the Yamaska River — Farnham is a bilingual industrial city in the Brome-Missisquoi regional county of the Estrie region of Quebec, in the Eastern Townships south of Montreal and east of the Richelieu Valley, on the Yamaska River at the foot of the Appalachian foothills, a community with deep roots in the textile manufacturing, farm equipment, and military history of the Eastern Townships (home to the former École de Technologie de Farnham military base). Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 121.5 mg/L (7.1 gpg) — classified as hard by Health Canada, reflecting the carbonate-rich Yamaska River watershed character.

Farnham draws from the Yamaska River in the Brome-Missisquoi valley — the Yamaska River drains the Eastern Townships Appalachian foothills including the Bromont, Sutton Mountains, and the Brome-Missisquoi farmland, where Cambrian and Ordovician carbonate rocks of the Appalachian fold belt produce moderately hard dissolution at 121.5 mg/L — harder than the Magog-Estrie Lac Memphrémagog supply (97 mg/L from reference data), reflecting the additional carbonate dissolution in the lower Yamaska River valley below the Sutton Mountains. Water quality reports are published following Ministère de l'Environnement standards.

At 121.5 mg/L, Farnham 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 Farnham industrial-era residential neighbourhoods near the Yamaska River.