Sainte-Catherine Water Hardness & Quality Report (2026)

Sainte-Catherine (Mauricie) receives its drinking water from a local Mauricie region river or reservoir source — a community in the Mauricie region between Trois-Rivières and Québec City on the south shore of the St. Lawrence near the confluence of the Rivière Batiscan and the St. Lawrence. The Mauricie corridor is known for the dramatic La Mauricie National Park, the Grand-Mère and Shawinigan hydroelectric heritage, and the region's transition from the Laurentian Shield to the St. Lawrence Lowlands. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 108 mg/L (6.3 gpg) — classified as moderately hard by Health Canada, consistent with the St. Lawrence Mauricie corridor supply character.

The Mauricie region at the Batiscan–St. Lawrence confluence zone sits at the transition between the Laurentian Shield (north shore tributaries bring very soft water) and the St. Lawrence Lowlands (sedimentary carbonate terrain producing harder water). The 108 mg/L supply reflects this transitional geology — moderately hard from the combined mineral input of the St. Lawrence lowlands carbonate and the northern Shield watershed tributaries. This is consistent with the broader St. Lawrence corridor between Quebec City (74–83.5 mg/L) and the Montérégie zones (84–128 mg/L).

At 108 mg/L, Sainte-Catherine (Mauricie) homes experience moderate scale deposits — cleaning every two months is adequate. Hot water tanks have a reliable operational lifespan. Water quality reports are published following Ministère de l'Environnement standards. Health Canada lead precautionary guidance applies to older pre-1975 residential properties in the community's established neighbourhoods near the Batiscan River corridor.