Maple Grove Water Hardness & Quality Report (2026)

The City of Maple Grove Water Utility serves over 70,000 residents in Maple Grove, Minnesota, within Hennepin County. Water is sourced from 10 primary wells in the surficial Glacial Drift aquifer and 2 emergency wells in the Mt. Simon-Hinckley bedrock aquifer. Raw water is pumped to the Maple Grove water treatment plant, which has a total pumping capacity of 34,000 gallons per minute. Treated water is stored in two elevated water towers and a ground storage reservoir with 10.5 million gallons combined capacity before distribution.

The supply originates from deep aquifer wells in Minnesota's Glacial Drift and bedrock formations beneath the Twin Cities metro area. These include Paleozoic sedimentary layers where groundwater percolates through limestone and sulfate-bearing rocks, dissolving minerals that impart a very hard character. The glacial drift overlay contributes additional mineral leaching, shaping a supply with significant dissolved solids from long-term interaction with carbonate-rich geology. Water undergoes treatment for iron (reduced from 0.02 to 0.001 ppm) and manganese (0.6 to 0.03 ppm) via chlorine and potassium permanganate oxidation, followed by silica sand filtration; chlorine and fluoride are also added per state requirements.

Very hard water causes substantial scale buildup on plumbing, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Fixtures like faucets and showerheads clog rapidly, while laundry and dishes show spotting. Regular vinegar descaling, annual heater flushes, and scale inhibitors are recommended; a whole-house water softener is strongly advised to mitigate damage and extend appliance life. The utility meets EPA legal standards overall, though five contaminants exceed health advocacy guidelines including disinfection byproducts; barium (0.011–0.12 ppm) and fluoride (0.79–1.6 ppm) are below legal limits, and lead and copper sampling confirms compliance.