Chilliwack-Downtown Water Hardness & Quality Report (2026)

The City of Chilliwack Utilities Department supplies drinking water to Chilliwack-Downtown and nearby areas in British Columbia's Fraser Valley Regional District. This supply comes entirely from groundwater, with 99.93% drawn from the Sardis-Vedder Aquifer and a small fraction from the Marble Hill Aquifer. Eight wells tap the Sardis-Vedder, while two access the Marble Hill. No surface water reservoirs or rivers are used, and treatment involves disinfection at wellhead facilities rather than centralized plants. The Sardis-Vedder Aquifer, a shallow, unconfined reservoir in the Fraser River Valley, is composed of Quaternary-age sand, gravel, and silt laid down by glacial outwash and the Fraser River and Vedder River. Underlying Tertiary bedrock is not the primary water source; the loose alluvial material is.

The water's soft character stems from its rapid infiltration through non-carbonate sands and gravels. This geology results in low dissolved mineral content, meaning minimal calcium and magnesium. The shallow nature of the Sardis-Vedder Aquifer makes it sensitive to surface contamination from agricultural runoff or other pollutants. This aquifer is associated with Quaternary glacial and alluvial deposits in the Fraser Valley and overlies Tertiary bedrock formations. The lack of contact with limestone or dolomite means the groundwater remains low in minerals.

Because the water is very soft, you'll find minimal scale buildup in appliances like water heaters, dishwashers, and coffee makers, which helps extend their lifespan and reduce energy costs. Soap and detergents lather easily. However, this soft water could potentially cause minor corrosion in older galvanized pipes, possibly leading to a metallic taste. If you notice this, monitor your plumbing and consider phosphate additives. A water softener isn't generally recommended, as it could over-soften the water and worsen corrosion risks. Instead, focus on filtration if taste or sediment is a concern. The City of Chilliwack's 2022 report confirmed all Health Canada guidelines were met, with excellent groundwater quality that remains sensitive to land-use changes.