Hard water in Forest Hills, MI
Reported by Grand Rapids · July 2025
- MI typical
- 112 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Forest Hills has about 138 mg/L of hardness, which is 8.1 grains per gallon. On the USGS scale that counts as hard. The number comes from Grand Rapids, dated July 2025.
Forest Hills sits 26 mg/L above the typical Michigan figure of 112. Of the 10 nearest cities we track, 1 has softer water and 6 have harder. The range nearby runs from 137 mg/L in East Grand Rapids to 524 in Grandville.
What 138 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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 138 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 × 8.1 gpg = 1,816 grains a day. A 24,000-grain unit regenerates about every 13 days.
EPA record for Forest Hills's water system
No health-based violations since 2016
Serves about 306,901 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
TapWaterData ties Forest Hills to this system. EPA's service-area records do not name Forest Hills, so check the utility printed on your water bill.
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 Forest Hills water hard?
Yes. It measures about 138 mg/L (8.1 grains per gallon), which the USGS classes as hard.
What is the water hardness in Forest Hills in grains per gallon?
About 8.1 gpg. One grain per gallon equals 17.1 mg/L, so 138 mg/L divided by 17.1 gives 8.1.
What size water softener do I need in Forest Hills?
For 3 people using 75 gallons each per day, 8.1 gpg works out to about 1,816 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.
Has the Forest Hills water system had EPA violations?
EPA records show no health-based violations for Grand Rapids since 2016.
Nearby cities
- East Grand Rapids137 mg/LHard
- Kentwood138 mg/LHard
- Grand Rapids138 mg/LHard
- Walker138 mg/LHard
- Grandville524 mg/LVery hard
- Belding269 mg/LVery hard
- Greenville346 mg/LVery hard
- Hudsonville385 mg/LVery hard
- Ionia395 mg/LVery hard
- Allendale260 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, July 29, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.