Hard water in Slinger, WI

Tap water hardness
485mg/L
28.4gpg
Very hard

Reported by Slinger Water Utility · October 2024

WI typical
170 mg/L
EPA health violations since 2016
1
Softener for 3 people
48k grain
Data
Utility report

The water in Slinger carries roughly 485 mg/L of dissolved calcium and magnesium, or 28.4 grains per gallon. That is very hard water. The number comes from Slinger Water Utility, dated October 2024.

Slinger on the hardness scale, with nearby cities
060120180240300360+WI typical 170Menomonee Falls: 174 mg/LMenomonee Falls 174Lisbon: 332 mg/LLisbon 332Sussex: 332 mg/LSussex 332West Bend: 340 mg/LWest Bend 340Jackson: 352 mg/LJackson 352Hartford: 426 mg/LHartford 426Germantown: 422 mg/LGermantown 422Cedarburg: 400 mg/LCedarburg 400Mequon: 440 mg/LMequon 440Grafton: 370 mg/LGrafton 370Slinger 485off the scalemg/L as calcium carbonate060120180240300360+WI 170Lisbon: 332 mg/LLisbon 332Sussex: 332 mg/LSussex 332West Bend: 340 mg/LWest Bend 340Jackson: 352 mg/LJackson 352Hartford: 426 mg/LHartford 426Germantown: 422 mg/LGermantown 422485 mg/Loff the scalemg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Slinger sits 315 mg/L above the typical Wisconsin figure of 170. None of the 10 nearest cities we track has harder water. The range nearby runs from 174 mg/L in Menomonee Falls to 440 in Mequon.

What 485 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 485 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.

Softener size for Slinger

3 people × 75 gallons a day × 28.4 gpg = 6,381 grains a day. A 48,000-grain unit regenerates about every 7 days.

Size it for your household

EPA record for Slinger's water system

Slinger Water Utility · PWSID WI2670116

1 health-based violation since 2016

Serves about 5,659 people from groundwater.

Health-based
1
Monitoring or reporting
1
Open now
1
20162017201820192020202120222023202420252026Lead and Copper Rule'16'18'20'22'24'26Lead and Copper Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Lead and Copper Rulecorrosion control and lead sampling12024Resolved

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 Slinger water hard?

Yes. It measures about 485 mg/L (28.4 grains per gallon), which the USGS classes as very hard.

What is the water hardness in Slinger in grains per gallon?

About 28.4 gpg. One grain per gallon equals 17.1 mg/L, so 485 mg/L divided by 17.1 gives 28.4.

What size water softener do I need in Slinger?

For 3 people using 75 gallons each per day, 28.4 gpg works out to about 6,381 grains a day. A 48,000-grain softener covers that with a regeneration about every 7 days.

Has the Slinger water system had EPA violations?

EPA records show 1 health-based violation for Slinger Water Utility 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

All 112 cities in Wisconsin

Hardness data: TapWaterData US Water Hardness (utility report, October 9, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.