Port Alberni Water Hardness & Quality Report (2026)

Port Alberni's drinking water is managed by the City of Port Alberni, drawing from Sproat Lake reservoir and the Stamp River watershed system in the Alberni Valley of central Vancouver Island. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 66.5 mg/L (3.9 gpg) — classified as moderately hard by Health Canada, somewhat harder than typical south Vancouver Island CRD supply (41–64 mg/L) and reflecting the central island's distinct watershed geology.

Port Alberni's 66.5 mg/L reflects the Sproat Lake watershed geology in the Vancouver Island Ranges — the Alberni Valley is surrounded by Wrangellia volcanic terrane basalt and the Karmutsen Formation — ancient Triassic oceanic plateau basalts that are more mineralised than the south island granitic basement supplying the CRD (Sooke Lake). The volcanic terrain of the central island releases slightly more calcium and bicarbonate than the south island's granitic and gneissic watershed, producing the moderately hard 66.5 mg/L supply at Port Alberni.

At 66.5 mg/L, Port Alberni residents experience light-to-moderate scale — occasional kettle cleaning every two months is adequate. Hot water tanks operate reliably at this hardness. The City of Port Alberni provides water quality information at portalberni.ca. Port Alberni's industrial and logging-community character means many residents also have private well connections supplementing or replacing municipal supply in rural areas of the Alberni Valley; private well users should test independently. Health Canada lead precautionary guidance applies to older pre-1975 properties in the city's post-war industrial housing stock.