Grand Falls-Windsor Water Hardness & Quality Report (2026)

Grand Falls-Windsor's drinking water is managed by the Town of Grand Falls-Windsor, drawing from the Exploits River watershed reservoir system — Grand Falls-Windsor is the largest inland city in Newfoundland, a twin-community formed by the amalgamation of Grand Falls (a planned mill town built by the Anglo-Newfoundland Development Company in 1905 for the Grand Falls paper mill) and Windsor, set in the Heart of the Island at the spectacular Grand Falls gorge on the Exploits River, historically the world's largest Atlantic salmon river before construction of the Exploits River dams. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness measures 38.5 mg/L (2.2 gpg) — classified as soft by Health Canada, consistent with the Newfoundland Shield watershed character with slight carbonate influence from the Exploits River geology.

Grand Falls-Windsor draws from the Exploits River — central Newfoundland's principal river, draining a vast watershed of Precambrian Shield (granites, gneisses, and Cambrian quartzite of the Gander Zone and Avalon Zone), with some Ordovician and Cambrian limestone in the Exploits sub-basin that adds slight mineral content. The 38.5 mg/L is at the upper end of the NL municipal water range (6.5–33.5 mg/L from reference data), reflecting the Exploits River's specific watershed geology that has slightly more carbonate influence than the pure granite Shield rivers of eastern Newfoundland.

With 38.5 mg/L, Grand Falls-Windsor homes are essentially scale-free — occasional kettle cleaning every three months is adequate. Hot water tanks have an excellent operational lifespan. The Town of Grand Falls-Windsor provides water quality information at grandfallswindsor.com. Health Canada lead precautionary guidance applies to pre-1975 properties in the historic Grand Falls mill-town planned community, one of the best-preserved early 20th-century planned industrial communities in Atlantic Canada.