Deep wells, very hard groundwater and a patchwork of plant softening and home softeners mean two west metro houses can have very different water. Here is how to read yours and keep glass and fixtures clear.
Most of the cities around Lake Minnetonka drink groundwater pumped from deep aquifers, and that water picks up calcium and magnesium on the way. When it evaporates on a shower door or around a faucet, the minerals stay behind as white spots and crust.
This guide explains how hard the local water is, why some homes see much less buildup than their neighbors, and which cleaning methods remove mineral film without damaging finishes.
The clearest local number comes from the City of Maple Grove, which says its water is very hard, averaging about 26 grains per gallon, because of naturally high calcium and magnesium in its groundwater. The city adds that this is common for the region. Neighboring cities that pump from the same kinds of aquifers face the same minerals unless they treat for them.
Wayzata's supply shows why the whole area is similar. Its drinking water comes from three wells between 100 and 507 feet deep that draw from the Prairie du Chien-Jordan and Quaternary Buried Artesian aquifers. Water that spends a long time moving through rock and buried gravel tends to carry a heavy mineral load.
Treatment varies by city and by house. Maple Grove reports that Eden Prairie softens its water at the treatment plant, which brings hardness down to moderate levels before it reaches the tap. In cities without plant softening, many households run their own softeners. Maple Grove says those home units are typically set to 1 to 2 grains per gallon and use an average of 40 pounds of salt a month.
So a house with a working softener may hardly see spots at all, while the house next door with an empty brine tank or no softener gets crust on every fixture. If buildup suddenly gets worse, check the salt level before anything else.
Maple Grove lists the signs of its hard water plainly: chalky buildup on glasses, faucets and showerheads, and soap that does not lather well. Other clues show up around the house.
Mineral deposits dissolve in mild acid. White vinegar, or a cleaner labeled for hard water, loosens spots on glass, chrome and porcelain. Apply it, give it time to work, then wipe with a soft cloth and rinse. A showerhead can soak in a bag of vinegar tied around it.
Be careful with stone. Marble, travertine and limestone counters and shower walls are etched by acid, so use a cleaner made for natural stone. Avoid abrasive pads on glass and polished fixtures; they scratch the surface and give minerals somewhere to grip.
The best defense is drying. A squeegee on the shower door after each use, and a quick towel wipe around the faucet, stop most spots from forming. When buildup has gone too far, a One-Time Deep Clean treats shower glass for hard water spots and details faucets around the base and handles. See the deep cleaning guide.
Hard water is not the only thing that shows up at the tap. Wayzata flushes its water mains each April and warns that flushing can temporarily discolor water, so residents should watch laundry until the water runs clear. The city describes the discoloration as temporary, and it is a separate issue from hardness. Hold off on white laundry and do not clean glass or fixtures with discolored water until it clears.
The questions Minnetonka homeowners ask most often about this topic, answered plainly.
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