How hard is the water in Sterling Heights, MI?

Tap water hardness
103mg/L
6.0gpg
Moderately hard

Reported by Clinton Township · September 2025

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

Tap water in Sterling Heights has about 103 mg/L of hardness, which is 6.0 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from Clinton Township, dated September 2025.

Sterling Heights on the hardness scale, with nearby cities
060120180240300360+MI typical 112Warren: 95 mg/LWarren 95Royal Oak: 96 mg/LRoyal Oak 96Troy: 100 mg/LTroy 100Rochester Hills: 100 mg/LRochester Hills 100Fraser: 101 mg/LFraser 101Roseville: 101 mg/LRoseville 101Utica: 103 mg/LUtica 103Mount Clemens: 103 mg/LMount Clemens 103Rochester: 104 mg/LRochester 104Madison Heights: 277 mg/LMadison Heights 277Sterling Heights 103mg/L as calcium carbonate060120180240300360+MI 112Warren: 95 mg/LWarren 95Troy: 100 mg/LTroy 100Fraser: 101 mg/LFraser 101Roseville: 101 mg/LRoseville 101Utica: 103 mg/LUtica 103Madison Heights: 277 mg/LMadison He. 277103 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Sterling Heights sits close to the typical Michigan figure of 112 mg/L. Of the 10 nearest cities we track, 6 have softer water and 2 have harder. The range nearby runs from 95 mg/L in Warren to 277 in Madison Heights.

What 103 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 Sterling Heights

3 people × 75 gallons a day × 6.0 gpg = 1,352 grains a day. A 24,000-grain unit regenerates about every 17 days.

Size it for your household

EPA record for Sterling Heights's water system

Sterling Heights, City of · PWSID MI0006385

No health-based violations since 2016

Serves about 127,000 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists Sterling Heights, City of as the system serving Sterling Heights. The hardness figure above comes from a different system's report, which TapWaterData uses for Sterling Heights.

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 Sterling Heights water hard?

Somewhat. It measures about 103 mg/L (6.0 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Sterling Heights in grains per gallon?

About 6.0 gpg. One grain per gallon equals 17.1 mg/L, so 103 mg/L divided by 17.1 gives 6.0.

What size water softener do I need in Sterling Heights?

For 3 people using 75 gallons each per day, 6.0 gpg works out to about 1,352 grains a day. A 24,000-grain softener covers that with a regeneration about every 17 days.

Has the Sterling Heights water system had EPA violations?

EPA records show no health-based violations for Sterling Heights, City of since 2016.

Nearby cities

All 118 cities in Michigan

Hardness data: TapWaterData US Water Hardness (utility report, September 19, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.