Thompson Water Hardness & Quality Report (2026)

Thompson (a Richmond neighbourhood in the southern portion of Richmond municipality, in the Terra Nova–Hamilton South corridor near the south bank of the Fraser River) receives its drinking water from the City of Richmond, purchasing bulk supply from Metro Vancouver (GVWD) — sourced from the protected Capilano, Seymour, and Coquitlam mountain watersheds. Water is treated at the Seymour-Capilano Filtration Plant using ozonation, biofiltration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness in the Thompson distribution sub-zone is 64 mg/L (3.7 gpg) — classified as moderately hard by Health Canada, notably harder than other Richmond sub-zones (Blundell 44.5 mg/L, Steveston 53 mg/L), reflecting the specific distribution characteristic at the southern end of the Richmond network.

The Thompson sub-zone at 64 mg/L represents one of the harder sub-zone measurements within the Richmond Metro Vancouver distribution — comparable to Seafair (86 mg/L, batch 24). The southern and southwestern Richmond distribution zones serve large geographic areas at the far end of the Metro Vancouver transmission pipeline network, where pipeline length and distribution pressure zone characteristics produce slightly harder sub-zone readings than the north Richmond zones closer to the main GVWD supply connection. The Coast Mountain granodiorite watershed remains the source, but distribution routing influences the measured hardness at the tap.

At 64 mg/L, Thompson-area homes experience light to moderate scale deposits — occasional kettle cleaning every two months is adequate. The City of Richmond provides water quality information at richmond.ca. Health Canada lead precautionary guidance applies to older pre-1975 residential properties in the established Richmond agricultural–residential areas in the south Richmond corridor.