Hard water in DeForest, WI
Reported by Deforest Waterworks · May 2024
- WI typical
- 170 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 32k grain
- Data
- Utility report
Tap water in DeForest has about 280 mg/L of hardness, which is 16.4 grains per gallon. On the USGS scale that counts as very hard. The number comes from Deforest Waterworks, dated May 2024.
DeForest sits 110 mg/L above the typical Wisconsin figure of 170. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 144 mg/L in Columbus to 420 in Monona.
What 280 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 280 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 × 16.4 gpg = 3,683 grains a day. A 32,000-grain unit regenerates about every 8 days.
EPA record for DeForest's water system
1 health-based violation since 2016
Serves about 10,500 people from groundwater.
- Health-based
- 1
- Monitoring or reporting
- 1
- Open now
- 1
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Lead and Copper Rulecorrosion control and lead sampling | 1 | 2024 | Resolved |
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 DeForest water hard?
Yes. It measures about 280 mg/L (16.4 grains per gallon), which the USGS classes as very hard.
What is the water hardness in DeForest in grains per gallon?
About 16.4 gpg. One grain per gallon equals 17.1 mg/L, so 280 mg/L divided by 17.1 gives 16.4.
What size water softener do I need in DeForest?
For 3 people using 75 gallons each per day, 16.4 gpg works out to about 3,683 grains a day. A 32,000-grain softener covers that with a regeneration about every 8 days.
Has the DeForest water system had EPA violations?
EPA records show 1 health-based violation for Deforest Waterworks since 2016, involving Lead and Copper Rule. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Waunakee282 mg/LVery hard
- Sun Prairie337 mg/LVery hard
- Madison341 mg/LVery hard
- Middleton337 mg/LVery hard
- Cottage Grove347 mg/LVery hard
- Monona420 mg/LVery hard
- McFarland364 mg/LVery hard
- Fitchburg270 mg/LVery hard
- Columbus144 mg/LHard
- Verona360 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, May 31, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.