Hard water in La Crosse, WI
Reported by La Crosse Waterworks · June 2025
- WI typical
- 170 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 32k grain
- Data
- Utility report
La Crosse water measures 290 mg/L (17.0 gpg) of hardness, very hard by USGS standards. The number comes from La Crosse Waterworks, dated June 2025.
At 290 mg/L, La Crosse is 120 mg/L above the typical Wisconsin figure of 170. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 49 mg/L in Chippewa Falls to 337 in Onalaska.
What 290 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 290 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 17.0 gpg = 3,816 grains a day. A 32,000-grain unit regenerates about every 8 days.
EPA record for La Crosse's water system
No health-based violations since 2016
Serves about 53,000 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 16
- Open now
- 0
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is La Crosse water hard?
Yes. It measures about 290 mg/L (17.0 grains per gallon), which the USGS classes as very hard.
What is the water hardness in La Crosse in grains per gallon?
About 17.0 gpg. One grain per gallon equals 17.1 mg/L, so 290 mg/L divided by 17.1 gives 17.0.
What size water softener do I need in La Crosse?
For 3 people using 75 gallons each per day, 17.0 gpg works out to about 3,816 grains a day. A 32,000-grain softener covers that with a regeneration about every 8 days.
Has the La Crosse water system had EPA violations?
EPA records show no health-based violations for La Crosse Waterworks since 2016. There were also 16 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Onalaska337 mg/LVery hard
- West Salem244 mg/LVery hard
- Holmen319 mg/LVery hard
- Reedsburg162 mg/LHard
- Altoona102 mg/LModerately hard
- Eau Claire101 mg/LModerately hard
- Lake Hallie61 mg/LModerately hard
- Chippewa Falls49 mg/LSoft
- Marshfield249 mg/LVery hard
- Baraboo240 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, June 25, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.