Hard water in Findlay, OH
Reported by Findlay City · April 2025
- OH typical
- 113 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Findlay water measures 138 mg/L (8.1 gpg) of hardness, hard by USGS standards. The number comes from Findlay City, dated April 2025.
At 138 mg/L, Findlay is 25 mg/L above the typical Ohio figure of 113. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 76 mg/L in Toledo to 380 in Bryan.
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 Findlay's water system
No health-based violations since 2016
Serves about 54,040 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 2
- Open now
- 1
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 Findlay 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 Findlay 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 Findlay?
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 Findlay water system had EPA violations?
EPA records show no health-based violations for Findlay City PWS since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Bowling Green265 mg/LVery hard
- Waterville110 mg/LModerately hard
- Lima301 mg/LVery hard
- Perrysburg85 mg/LModerately hard
- Marion311 mg/LVery hard
- Toledo76 mg/LModerately hard
- Bryan380 mg/LVery hard
- Sandusky260 mg/LVery hard
- Sidney342 mg/LVery hard
- Marysville316 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, April 1, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.