How hard is the water in Warren, MI?

Tap water hardness
95mg/L
5.5gpg
Moderately hard

Reported by Warren, City of · June 2025

MI typical
112 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Tap water in Warren has about 95 mg/L of hardness, which is 5.5 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from Warren, City of, dated June 2025.

Warren on the hardness scale, with nearby cities
060120180240300360+MI typical 112Hamtramck: 87 mg/LHamtramck 87Harper Woods: 95 mg/LHarper Woods 95Royal Oak: 96 mg/LRoyal Oak 96Ferndale: 100 mg/LFerndale 100Roseville: 101 mg/LRoseville 101Fraser: 101 mg/LFraser 101St. Clair Shores: 101 mg/LSt. Clair Shores 101Sterling Heights: 103 mg/LSterling Heights 103Eastpointe: 266 mg/LEastpointe 266Madison Heights: 277 mg/LMadison Heights 277Warren 95mg/L as calcium carbonate060120180240300360+MI 112Ferndale: 100 mg/LFerndale 100Roseville: 101 mg/LRoseville 101Fraser: 101 mg/LFraser 101Sterling Heights: 103 mg/LSterling H. 103Eastpointe: 266 mg/LEastpointe 266Madison Heights: 277 mg/LMadison He. 27795 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 95 mg/L, Warren is 17 mg/L below the typical Michigan figure of 112. Of the 10 nearest cities we track, 1 has softer water and 8 have harder. The range nearby runs from 87 mg/L in Hamtramck to 277 in Madison Heights.

What 95 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Warren

3 people × 75 gallons a day × 5.5 gpg = 1,244 grains a day. A 24,000-grain unit regenerates about every 19 days.

Size it for your household

EPA record for Warren's water system

Warren, City of · PWSID MI0006900

No health-based violations since 2016

Serves about 134,056 people from surface water.

Health-based
0
Monitoring or reporting
2
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 Warren water hard?

Somewhat. It measures about 95 mg/L (5.5 grains per gallon), which the USGS classes as moderately hard.

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

About 5.5 gpg. One grain per gallon equals 17.1 mg/L, so 95 mg/L divided by 17.1 gives 5.5.

What size water softener do I need in Warren?

For 3 people using 75 gallons each per day, 5.5 gpg works out to about 1,244 grains a day. A 24,000-grain softener covers that with a regeneration about every 19 days.

Has the Warren water system had EPA violations?

EPA records show no health-based violations for Warren, City of since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 118 cities in Michigan

Hardness data: TapWaterData US Water Hardness (utility report, June 11, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.