Hard water in Miamisburg, OH

Tap water hardness
142mg/L
8.3gpg
Hard

Reported by Montgomery County Water Services 1 PWS · September 2025

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

Miamisburg water measures 142 mg/L (8.3 gpg) of hardness, hard by USGS standards. The number comes from Montgomery County Water Services 1 PWS, dated September 2025.

Miamisburg on the hardness scale, with nearby cities
060120180240300360+OH typical 113Bellbrook: 139 mg/LBellbrook 139Centerville: 142 mg/LCenterville 142West Carrollton: 147 mg/LWest Carrollton 147Moraine: 147 mg/LMoraine 147Kettering: 147 mg/LKettering 147Dayton: 147 mg/LDayton 147Trotwood: 147 mg/LTrotwood 147Oakwood: 148 mg/LOakwood 148Shiloh: 155 mg/LShiloh 155Middletown: 303 mg/LMiddletown 303Miamisburg 142mg/L as calcium carbonate060120180240300360+OH 113Bellbrook: 139 mg/LBellbrook 139Centerville: 142 mg/LCenterville 142West Carrollton: 147 mg/LWest Carro. 147Moraine: 147 mg/LMoraine 147Kettering: 147 mg/LKettering 147Oakwood: 148 mg/LOakwood 148142 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 142 mg/L, Miamisburg is 29 mg/L above the typical Ohio figure of 113. Of the 10 nearest cities we track, 1 has softer water and 8 have harder. The range nearby runs from 139 mg/L in Bellbrook to 303 in Middletown.

What 142 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 142 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.

Softener size for Miamisburg

3 people × 75 gallons a day × 8.3 gpg = 1,872 grains a day. A 24,000-grain unit regenerates about every 12 days.

Size it for your household

EPA record for Miamisburg's water system

Miamisburg City PWS · PWSID OH5701212

No health-based violations since 2016

Serves about 19,790 people from groundwater.

Health-based
0
Monitoring or reporting
3
Open now
1

EPA lists Miamisburg City PWS as the system serving Miamisburg. The hardness figure above comes from a different system's report, which TapWaterData uses for Miamisburg.

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 Miamisburg water hard?

Yes. It measures about 142 mg/L (8.3 grains per gallon), which the USGS classes as hard.

What is the water hardness in Miamisburg in grains per gallon?

About 8.3 gpg. One grain per gallon equals 17.1 mg/L, so 142 mg/L divided by 17.1 gives 8.3.

What size water softener do I need in Miamisburg?

For 3 people using 75 gallons each per day, 8.3 gpg works out to about 1,872 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.

Has the Miamisburg water system had EPA violations?

EPA records show no health-based violations for Miamisburg City PWS since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 108 cities in Ohio

Hardness data: TapWaterData US Water Hardness (utility report, September 16, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.