Hard water in Cudahy, WI
Reported by Cudahy Waterworks · May 2023
- WI typical
- 170 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Cudahy has about 142 mg/L of hardness, which is 8.3 grains per gallon. On the USGS scale that counts as hard. The number comes from Cudahy Waterworks, dated May 2023.
At 142 mg/L, Cudahy is 28 mg/L below the typical Wisconsin figure of 170. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 129 mg/L in Whitefish Bay to 300 in Caledonia.
What 142 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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 142 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 × 8.3 gpg = 1,868 grains a day. A 24,000-grain unit regenerates about every 12 days.
EPA record for Cudahy's water system
No health-based violations since 2016
Serves about 18,659 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- 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 Cudahy water hard?
Yes. It measures about 142 mg/L (8.3 grains per gallon), which the USGS classes as hard.
What is the water hardness in Cudahy in grains per gallon?
About 8.3 gpg. One grain per gallon equals 17.1 mg/L, so 142 mg/L divided by 17.1 gives 8.3.
What size water softener do I need in Cudahy?
For 3 people using 75 gallons each per day, 8.3 gpg works out to about 1,868 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.
Has the Cudahy water system had EPA violations?
EPA records show no health-based violations for Cudahy Waterworks since 2016.
Nearby cities
- St. Francis135 mg/LHard
- South Milwaukee210 mg/LVery hard
- Oak Creek210 mg/LVery hard
- Greenfield135 mg/LHard
- Franklin210 mg/LVery hard
- West Allis135 mg/LHard
- Milwaukee135 mg/LHard
- Shorewood130 mg/LHard
- Caledonia300 mg/LVery hard
- Whitefish Bay129 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, May 24, 2023), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.