Hard water in Montgomery, OH
Reported by Indian Hill City PWS · August 2025
- OH typical
- 113 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Montgomery carries roughly 150 mg/L of dissolved calcium and magnesium, or 8.8 grains per gallon. That is hard water. The number comes from Indian Hill City PWS, dated August 2025.
Montgomery sits 37 mg/L above the typical Ohio figure of 113. Of the 10 nearest cities we track, 7 have softer water and 2 have harder. The range nearby runs from 45 mg/L in Monroe to 303 in Middletown.
What 150 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 150 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 × 8.8 gpg = 1,973 grains a day. A 24,000-grain unit regenerates about every 12 days.
EPA record for Montgomery's water system
No health-based violations since 2016
Serves about 15,000 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
TapWaterData ties Montgomery to this system. EPA's service-area records do not name Montgomery, 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 Montgomery water hard?
Yes. It measures about 150 mg/L (8.8 grains per gallon), which the USGS classes as hard.
What is the water hardness in Montgomery in grains per gallon?
About 8.8 gpg. One grain per gallon equals 17.1 mg/L, so 150 mg/L divided by 17.1 gives 8.8.
What size water softener do I need in Montgomery?
For 3 people using 75 gallons each per day, 8.8 gpg works out to about 1,973 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.
Has the Montgomery water system had EPA violations?
EPA records show no health-based violations for Indian Hill City PWS since 2016.
Nearby cities
- The Village of Indian Hill150 mg/LHard
- Beckett Ridge111 mg/LModerately hard
- Mason280 mg/LVery hard
- Norwood113 mg/LModerately hard
- Cincinnati113 mg/LModerately hard
- Fairfield111 mg/LModerately hard
- Monroe45 mg/LSoft
- Hamilton105 mg/LModerately hard
- Amelia130 mg/LHard
- Middletown303 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, August 5, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.