The Cariboo Regional District has issued a water quality advisory, to the Horse Lake water users as a result of levels of manganese (Mn) in its drinking water supply. The quality of the drinking water has not changed, but the move is due to changed Canadian guidelines for drinking water. Health Canada established a new maximum acceptable concentration for manganese in drinking water of 0.12 mg/L. Historical water test results show that the wells in Horse lake have produced between 0.14 to 0.29 mg/L of manganese. These manganese levels vary per well and what time of year the tests were taken.
Manitoba cautions on manganese in well water
A significant number of wells in Manitoba may be carrying water with manganese levels well above new health standards, particularly for infants. The province on May 3 issued an advisory for owners of private wells that their water “may exceed a new health-based guideline” for the trace element. The element occurs naturally, and commonly, in well water throughout Canada. It’s often associated with discoloured (that is, brown or blackish) water, which can stain laundry and/or plumbing fixtures, and which some well owners deal with through water treatment.