Hard water in Menomonee Falls, WI

Tap water hardness

174mg/L

10.2gpg

Hard

Reported by Menomonee Falls WW - Surface Water · August 2025

WI typical: 170 mg/L
EPA health violations since 2016: 1
Softener for 3 people: 24k grain
Data: Utility report

Tap water in Menomonee Falls has about 174 mg/L of hardness, which is 10.2 grains per gallon. On the USGS scale that counts as hard. The number comes from Menomonee Falls WW - Surface Water, dated August 2025.

Menomonee Falls on the hardness scale, with nearby cities

Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Menomonee Falls sits close to the typical Wisconsin figure of 170 mg/L. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 133 mg/L in Fox Point to 440 in Mequon.

What 174 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 174 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 Menomonee Falls

3 people × 75 gallons a day × 10.2 gpg = 2,290 grains a day. A 24,000-grain unit regenerates about every 10 days.

Size it for your household

EPA record for Menomonee Falls's water system

Menomonee Falls WW - Surface Water · PWSID WI2680082

1 health-based violation since 2016

Serves about 23,867 people from surface water.

Health-based: 1
Monitoring or reporting: 1
Open now: 0

Each dot is one health-based violation, placed at the start of its compliance period.

Contaminant or rule	Violations	Period	Status
Total Coliform Rulebacteria	1	2016	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 Menomonee Falls water hard?

Yes. It measures about 174 mg/L (10.2 grains per gallon), which the USGS classes as hard.

What is the water hardness in Menomonee Falls in grains per gallon?

About 10.2 gpg. One grain per gallon equals 17.1 mg/L, so 174 mg/L divided by 17.1 gives 10.2.

What size water softener do I need in Menomonee Falls?

For 3 people using 75 gallons each per day, 10.2 gpg works out to about 2,290 grains a day. A 24,000-grain softener covers that with a regeneration about every 10 days.

Has the Menomonee Falls water system had EPA violations?

EPA records show 1 health-based violation for Menomonee Falls WW - Surface Water since 2016, involving Total Coliform 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, August 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.