Port Coquitlam Water Hardness & Quality Report (2026)

Port Coquitlam receives its drinking water through the City of Port Coquitlam, purchasing bulk supply from Metro Vancouver (GVWD) and supplementing with local groundwater from the Pitt River valley aquifer system. Metro Vancouver water is treated at the Seymour-Capilano Filtration Plant using ozonation, biofiltration, UV disinfection, and chloramination; local well water receives additional treatment. All supply meets the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness is 83.5 mg/L (4.9 gpg) — classified as moderately hard by Health Canada, significantly elevated above Metro Vancouver's 4–6 mg/L mountain source baseline due to the local groundwater blending.

Port Coquitlam occupies the flood plain at the confluence of the Pitt River and the Fraser River, where deep Quaternary glaciofluvial sand and gravel deposits form a productive aquifer beneath the valley floor. This Pitt River valley aquifer contains calcareous material eroded from the Coast Mountain granodiorite and surrounding sedimentary rock, contributing moderate dissolved calcium and magnesium when blended with Metro Vancouver's ultra-soft mountain supply. The resulting 83.5 mg/L is one of the more elevated hardness values in the Metro Vancouver supply area.

At 83.5 mg/L, Port Coquitlam residents experience moderate scale deposits on tap aerators and kettle elements — descaling every two months is appropriate. Hot water tanks operate reliably at this hardness without dedicated treatment. Port Coquitlam provides annual water quality information and reports at portcoquitlam.ca; residents in older homes should note that the elevated hardness and local groundwater blending may require periodic maintenance checks on water heaters and plumbing fittings.