Whitehorse Water Hardness & Quality Report (2026)

Whitehorse's drinking water is managed by the City of Whitehorse, the capital and largest city of the Yukon Territory, drawing from the Yukon River via the Whitehorse Water Treatment Plant on the river's east bank. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness measures 28 mg/L (1.6 gpg) — classified as soft by Health Canada, reflecting the Yukon River's very soft character from the Yukon's dominantly insoluble Cordilleran and Precambrian geological terrain.

The Yukon River at Whitehorse flows from Marsh Lake and the Yukon Southern Lakes corridor — a landscape of ancient Precambrian metamorphic gneiss and schist (the Yukon Crystalline Terrane) intermixed with Palaeozoic volcanic and intrusive formations. These highly insoluble crystalline and volcanic rock types release minimal dissolved calcium, producing the very soft supply characteristic of major Yukon and northwestern watershed systems. The 28 mg/L is consistent with other northern Canadian river sources (Fredericton 30 mg/L, NB and NL Shield rivers) draining predominantly insoluble Precambrian terrain.

With 28 mg/L of hardness, Whitehorse homes are essentially scale-free — appliances, kettles, and taps require virtually no descaling attention. Hot water tanks have an excellent operational lifespan. The mildly corrosive soft water warrants periodic checking of copper pipe condition in older buildings. The City of Whitehorse provides water quality information at whitehorse.ca; Whitehorse's extreme subarctic climate creates unique considerations for water system maintenance including freeze protection in the distribution infrastructure serving Yukon's capital city.