Hard water in Tecumseh, MI
Reported by Tecumseh · May 2022
- MI typical
- 112 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 48k grain
- Data
- Utility report
The water in Tecumseh carries roughly 348 mg/L of dissolved calcium and magnesium, or 20.4 grains per gallon. That is very hard water. The number comes from Tecumseh, dated May 2022.
At 348 mg/L, Tecumseh is 236 mg/L above the typical Michigan figure of 112. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 91 mg/L in Wayne to 460 in South Lyon.
What 348 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
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 348 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 × 20.4 gpg = 4,579 grains a day. A 48,000-grain unit regenerates about every 10 days.
EPA record for Tecumseh's water system
No health-based violations since 2016
Serves about 8,521 people from groundwater.
- 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 Tecumseh water hard?
Yes. It measures about 348 mg/L (20.4 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Tecumseh in grains per gallon?
About 20.4 gpg. One grain per gallon equals 17.1 mg/L, so 348 mg/L divided by 17.1 gives 20.4.
What size water softener do I need in Tecumseh?
For 3 people using 75 gallons each per day, 20.4 gpg works out to about 4,579 grains a day. A 48,000-grain softener covers that with a regeneration about every 10 days.
Has the Tecumseh water system had EPA violations?
EPA records show no health-based violations for Tecumseh since 2016.
Nearby cities
- Adrian221 mg/LVery hard
- Saline123 mg/LHard
- Ann Arbor156 mg/LHard
- Ypsilanti168 mg/LHard
- Jackson221 mg/LVery hard
- Monroe122 mg/LHard
- Whitmore Lake184 mg/LVery hard
- Romulus92 mg/LModerately hard
- Wayne91 mg/LModerately hard
- South Lyon460 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, May 31, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.