Hard water in Sidney, OH
County estimate from 285 water samples in Shelby County · July 2026
- OH typical
- 113 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 32k grain
- Data
- County estimate
Water samples from around Sidney put hardness at about 342 mg/L (20.0 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 285 samples taken across Shelby County, mostly wells and streams, not a test of Sidney's treated tap water. One more reason for caution: EPA lists Sidney's water system as using surface water, which is often softer than the wells behind the county figure.
At 342 mg/L, Sidney is 229 mg/L above the typical Ohio figure of 113. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 49 mg/L in Piqua to 360 in Springfield.
What 342 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 342 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 × 20.0 gpg = 4,500 grains a day. A 32,000-grain unit regenerates about every 7 days.
EPA record for Sidney's water system
1 health-based violation since 2016
Serves about 20,614 people from surface water.
- Health-based
- 1
- Monitoring or reporting
- 3
- Open now
- 1
EPA lists this system as serving Sidney.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Total trihalomethanes (TTHM)a disinfection byproduct | 1 | 2024 | Resolved |
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 Sidney water hard?
Yes. It measures about 342 mg/L (20.0 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Sidney in grains per gallon?
About 20.0 gpg. One grain per gallon equals 17.1 mg/L, so 342 mg/L divided by 17.1 gives 20.0.
What size water softener do I need in Sidney?
For 3 people using 75 gallons each per day, 20.0 gpg works out to about 4,500 grains a day. A 32,000-grain softener covers that with a regeneration about every 7 days.
Has the Sidney water system had EPA violations?
EPA records show 1 health-based violation for Sidney City PWS since 2016, involving Total trihalomethanes (TTHM). There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Piqua49 mg/LSoft
- Troy328 mg/LVery hard
- Vandalia155 mg/LHard
- Huber Heights155 mg/LHard
- Clayton155 mg/LHard
- Englewood155 mg/LHard
- Lima301 mg/LVery hard
- Springfield360 mg/LVery hard
- Shiloh155 mg/LHard
- Fairborn232 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.