The Sioux Falls Hard Water Guide: What's Really in Your Tap

Sioux Falls draws most of its water from the Big Sioux Aquifer, and while it's safe to drink, it's also exceptionally hard — averaging 18 to 22 grains per gallon. Anything above 10 grains is classified as 'very hard' by the U.S. Geological Survey.

Hardness comes from dissolved calcium and magnesium. Those minerals aren't dangerous, but they change how water behaves. Soap won't lather properly, glassware gets etched, water heaters have to work harder, and skin often feels tight after showering.

The financial cost is real. Studies from the Water Quality Research Foundation show hard water can shorten the life of a water heater by up to 50% and cut washing machine efficiency by 30% or more.

The fix is a properly sized ion-exchange softener. Modern EcoWater units use a fraction of the salt older systems did, monitor themselves, and pay for themselves in appliance lifespan and detergent savings within a few years.

If you're not sure how hard your water is, book a free in-home test and we'll give you the numbers, no pressure.