Hard water in Claremore, OK
County estimate from 147 water samples in Rogers County · July 2026
- OK typical
- 152 mg/L
- EPA health violations since 2016
- 27
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Claremore put hardness at about 131 mg/L (7.7 gpg), which would be hard on the USGS scale. Treat this as a rough guide: it is the median of 147 samples taken across Rogers County, mostly wells and streams, not a test of Claremore's treated tap water. One more reason for caution: EPA lists Claremore's water system as using surface water, which is often softer than the wells behind the county figure.
Claremore sits 21 mg/L below the typical Oklahoma figure of 152. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 92 mg/L in Catoosa to 153 in Owasso.
What 131 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 131 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 × 7.7 gpg = 1,724 grains a day. A 24,000-grain unit regenerates about every 13 days.
EPA record for Claremore's water system
27 health-based violations since 2016
Serves about 15,873 people from surface water.
- Health-based
- 27
- Monitoring or reporting
- 0
- Open now
- 0
EPA lists this system as serving Claremore.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Haloacetic acids (HAA5)a disinfection byproduct | 17 | 2019–2022 | Resolved |
| Surface Water Treatment Rulefiltration and disinfection | 1 | 2022 | Resolved |
| Total trihalomethanes (TTHM)a disinfection byproduct | 9 | 2016–2018 | 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 Claremore water hard?
Yes. It measures about 131 mg/L (7.7 grains per gallon), which the USGS classes as hard.
What is the water hardness in Claremore in grains per gallon?
About 7.7 gpg. One grain per gallon equals 17.1 mg/L, so 131 mg/L divided by 17.1 gives 7.7.
What size water softener do I need in Claremore?
For 3 people using 75 gallons each per day, 7.7 gpg works out to about 1,724 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.
Has the Claremore water system had EPA violations?
EPA records show 27 health-based violations for Claremore since 2016, involving Haloacetic acids (HAA5), Surface Water Treatment Rule, Total trihalomethanes (TTHM).
Nearby cities
- Owasso153 mg/LHard
- Catoosa92 mg/LModerately hard
- Collinsville153 mg/LHard
- Skiatook153 mg/LHard
- Tulsa110 mg/LModerately hard
- Broken Arrow92 mg/LModerately hard
- Coweta92 mg/LModerately hard
- Bixby92 mg/LModerately hard
- Jenks148 mg/LHard
- Sand Springs111 mg/LModerately 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.