How hard is the water in St. Clair Shores, MI?

Tap water hardness
101mg/L
5.9gpg
Moderately hard

Reported by Clinton Township · March 2025

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

St. Clair Shores water measures 101 mg/L (5.9 gpg) of hardness, moderately hard by USGS standards. The number comes from Clinton Township, dated March 2025.

St. Clair Shores on the hardness scale, with nearby cities
060120180240300360+MI typical 112Harper Woods: 95 mg/LHarper Woods 95Warren: 95 mg/LWarren 95Grosse Pointe: 95 mg/LGrosse Pointe 95Grosse Pointe Park: 95 mg/LGrosse Pointe Park 95Roseville: 101 mg/LRoseville 101Fraser: 101 mg/LFraser 101Mount Clemens: 103 mg/LMount Clemens 103Sterling Heights: 103 mg/LSterling Heights 103Grosse Pointe Farms: 110 mg/LGrosse Pointe Farms 110Eastpointe: 266 mg/LEastpointe 266St. Clair Shores 101mg/L as calcium carbonate060120180240300360+MI 112Harper Woods: 95 mg/LHarper Woo. 95Warren: 95 mg/LWarren 95Roseville: 101 mg/LRoseville 101Fraser: 101 mg/LFraser 101Grosse Pointe Farms: 110 mg/LGrosse Poi. 110Eastpointe: 266 mg/LEastpointe 266101 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

St. Clair Shores sits 11 mg/L below the typical Michigan figure of 112. Of the 10 nearest cities we track, 4 have softer water and 4 have harder. The range nearby runs from 95 mg/L in Harper Woods to 266 in Eastpointe.

What 101 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 St. Clair Shores

3 people × 75 gallons a day × 5.9 gpg = 1,330 grains a day. A 24,000-grain unit regenerates about every 18 days.

Size it for your household

EPA record for St. Clair Shores's water system

ST. Clair Shores, City of · PWSID MI0006280

No health-based violations since 2016

Serves about 59,715 people from surface water.

Health-based
0
Monitoring or reporting
7
Open now
0

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

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 St. Clair Shores water hard?

Somewhat. It measures about 101 mg/L (5.9 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in St. Clair Shores in grains per gallon?

About 5.9 gpg. One grain per gallon equals 17.1 mg/L, so 101 mg/L divided by 17.1 gives 5.9.

What size water softener do I need in St. Clair Shores?

For 3 people using 75 gallons each per day, 5.9 gpg works out to about 1,330 grains a day. A 24,000-grain softener covers that with a regeneration about every 18 days.

Has the St. Clair Shores water system had EPA violations?

EPA records show no health-based violations for ST. Clair Shores, City of since 2016. There were also 7 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, March 24, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.