Water softeners in Rochester
Help for homes on Rochester Public Utilities water, from older houses near downtown to newer subdivisions on the edges of town.
If your home is on Rochester Public Utilities water, you're starting from known numbers. RPU says its water carries 17 grains of hardness per gallon, about 280 parts per million. That's hard enough that most households notice it on glass shower doors, in kettles and on dishwasher racks within a few weeks, which is why softeners are so common here.
Where Rochester's water comes from
RPU's 2025 drinking water report describes 29 wells, 389 to 981 feet deep, drawing from the Jordan aquifer and combinations of the Prairie du Chien, Jordan, Wonewoc and St. Lawrence formations. Water that sits in that layered limestone and sandstone for a long time picks up calcium and magnesium, and that's the hardness you're fighting. The same report lists sodium in the source water at 8.77 ppm or less, and notes that home softening can raise it.
Set it for 17, not 30
A Post Bulletin column quoted the city's Water Reclamation Plant environmental manager saying new softeners often ship set for 30 grains, which is more than Rochester water needs. A unit set higher than your water uses more salt and more water every time it regenerates. If you've moved into a house with an existing softener, or bought one off the shelf, checking the hardness setting is a free first step.
Older homes and newer ones
Rochester grew outward from the South Fork of the Zumbro River, so you'll find everything from early 1900s homes with galvanized lines to recent builds with PEX. Older plumbing may already carry scale, and a company may suggest flushing the water heater or replacing badly scaled fixtures when the softener goes in. New copper plumbing is a special case: Minnesota health officials suggest holding off on softening for the first few weeks so the pipes can form a protective layer.
What people in Rochester usually call about
- A first softener for a house that never had one
- An old timer-based unit that burns through bags of salt
- Resin or valve problems after 10 or more years of service
- A drinking-water tap so the kitchen isn't using softened water
Common questions
How hard is Rochester city water?
Rochester Public Utilities lists its water at 17 grains per gallon, or about 280 ppm, which is hard.
Should I drink softened water?
RPU recommends keeping a separate, unsoftened supply for cooking and drinking if you use a softener.
Services in Rochester
- Water softener installationA new softener sized to Rochester-area hardness and your household, with a proper drain and bypass.
- Water softener repairFix units that stopped softening, won't regenerate, use no salt or run water to the drain.
- Salt-saving softener upgradesTune-ups and high-efficiency units that cut salt, water use and chloride going down the drain.
- Reverse osmosis drinking waterUnder-sink RO for drinking and cooking water, often paired with a softener or a private well.
- Well water treatmentTesting-led treatment for private wells: iron, sediment, nitrate and bacteria, plus softening.
Nearby areas
Crusty faucets or a softener that quit?
One call puts you in touch with a water treatment company that works in Rochester and nearby towns.