Hard water in Mason, MI
Reported by Mason, City of · August 2024
- MI typical
- 112 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 48k grain
- Data
- Utility report
Mason water measures 355 mg/L (20.8 gpg) of hardness, very hard by USGS standards. The number comes from Mason, City of, dated August 2024.
Mason sits 243 mg/L above the typical Michigan figure of 112. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 96 mg/L in Marshall to 458 in Waverly.
What 355 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 355 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 × 20.8 gpg = 4,671 grains a day. A 48,000-grain unit regenerates about every 10 days.
EPA record for Mason's water system
No health-based violations since 2016
Serves about 8,252 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 5
- 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 Mason water hard?
Yes. It measures about 355 mg/L (20.8 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Mason in grains per gallon?
About 20.8 gpg. One grain per gallon equals 17.1 mg/L, so 355 mg/L divided by 17.1 gives 20.8.
What size water softener do I need in Mason?
For 3 people using 75 gallons each per day, 20.8 gpg works out to about 4,671 grains a day. A 48,000-grain softener covers that with a regeneration about every 10 days.
Has the Mason water system had EPA violations?
EPA records show no health-based violations for Mason, City of since 2016. There were also 5 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Okemos425 mg/LVery hard
- Lansing446 mg/LVery hard
- East Lansing194 mg/LVery hard
- Waverly458 mg/LVery hard
- Grand Ledge458 mg/LVery hard
- Jackson221 mg/LVery hard
- Howell117 mg/LModerately hard
- Owosso339 mg/LVery hard
- Brighton418 mg/LVery hard
- Marshall96 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (utility report, August 8, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.