Maillardville Water Hardness & Quality Report (2026)

Maillardville's drinking water is managed by the City of Coquitlam, purchasing supply from Metro Vancouver (GVWD) — drawing from the Coquitlam Lake watershed and supplementary Seymour-Capilano system sources. Water is treated and distributed through Coquitlam's municipal infrastructure, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness in the Maillardville distribution sub-zone is 54.5 mg/L (3.2 gpg) — classified as soft by Health Canada, consistent with a west Coquitlam sub-zone receiving a significant proportion of the soft Metro Vancouver wholesale supply blend.

Maillardville (Canada's oldest French-Canadian community west of Manitoba — established in 1909 to house Coquitlam lumber mill workers from Quebec, now a celebrated heritage neighbourhood with the Place Maillardville community square, Mackin Park, and the annual Festival du Bois francophone cultural celebration) sits at the western edge of Coquitlam, closer to the Burnaby boundary than the eastern Tri-Cities Coquitlam supply zone. The Maillardville 54.5 mg/L is softer than the eastern Coquitlam Port Moody zone (87–94 mg/L from Coquitlam Lake supply) — reflecting the western distribution sub-zone's blend of Metro Vancouver's softer Seymour-Capilano source with the harder local Coquitlam Lake supply.

With 54.5 mg/L, Maillardville homes are essentially scale-free — occasional kettle cleaning every three months is adequate. Hot water tanks have an excellent operational lifespan. The City of Coquitlam provides water quality information at coquitlam.ca. Health Canada lead precautionary guidance applies to older pre-1975 properties in the historic Maillardville heritage neighbourhood around Mackin Park.