Water softeners in St. Paul, MN

Do you have hard water?

Hard water carries more calcium and magnesium. It leaves white scale on faucets and showerheads, spots on dishes and buildup inside water heaters. The Minnesota Department of Health says a softener may be worth it above 7 grains per gallon (120 mg/L), and notes that softening is never required.

Where your water comes from matters. Saint Paul Regional Water Services softens its water at the treatment plant. Its August 2026 mineral report shows treated water at about 97 mg/L, or 5.67 grains per gallon, and says SPRWS customers shouldn’t need a home softener.

Many suburban homes are on a different city system or a private well, and that water may be much harder. Check your water utility’s annual water quality report, or test your water with a kit or an accredited lab. Private well owners are responsible for their own testing.

How a softener works

Most home softeners use ion exchange. Water passes through a tank of resin beads that hold onto calcium and magnesium and release sodium or potassium in their place.

When the beads are full, the softener regenerates. It rinses the resin with a strong salt or potassium chloride solution from the brine tank, then sends the minerals and brine down the drain. MDH recommends setting the softener to your water’s actual hardness, because a higher setting wastes salt and water.

Salt, sodium and chloride

Keep the brine tank stocked with the salt or potassium chloride your softener calls for. Softened water carries added sodium. MDH suggests leaving one cold tap unsoftened for drinking and cooking, or using potassium chloride, especially for anyone watching their sodium.

Chloride from softener discharge ends up in Minnesota lakes and streams, and treatment plants and septic systems can’t remove it. MDH advises softening only what you need. Many homes skip outdoor faucets and toilets, and some soften only the hot water.

What a softener does not do

A softener removes hardness. It does not disinfect water or remove most other contaminants. MDH’s home water treatment guidance says no single device removes everything, so find out what is in your water before you buy treatment.

If you need to remove a specific contaminant, choose equipment certified for it by NSF, UL or WQA. Iron or manganese can foul softener resin and may call for pre-filtering.

Installation and service

We install softeners on the main water line with a bypass valve, a drain connection for regeneration and plumbing that leaves the taps you choose unsoftened. Softer water also helps protect your water heater and tankless unit from scale.

Every softener needs regular upkeep to work well. MDH notes that a neglected unit can lose effectiveness. If your softener stops working, uses too much salt or runs constantly, schedule a service visit.

Signs you may need a softener or softener service

White scale on faucets, showerheads and glass shower doors
Spots or film on dishes after washing
Soap and shampoo that don’t lather well
Scale or popping noises in your water heater
Your softener’s salt level never goes down
Hard-water spots return even with a softener installed

Common questions

Do I need a water softener in St. Paul?

If you are served by Saint Paul Regional Water Services, probably not. SPRWS softens its water at the plant and says its customers shouldn’t need a home softener. Suburban city water and private wells can be harder, so check your utility’s report or test your water.

How hard does water have to be to need a softener?

The Minnesota Department of Health says a softener may be worth considering above 7 grains per gallon, or 120 mg/L. Softening is a choice, not a requirement.

Does a softener make my water safe to drink?

No. A softener removes hardness minerals. It does not disinfect water or remove most contaminants. Test your water and choose certified treatment for any specific contaminant.

Can I use potassium instead of salt?

Yes, many softeners can regenerate with potassium chloride. It adds potassium instead of sodium to the water. Check your softener’s instructions first.