How hard is the water in Catoosa, OK?

Tap water hardness
92mg/L
5.4gpg
Moderately hard

Reported by Wagoner CO. RWD #4 · August 2025

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

The water in Catoosa carries roughly 92 mg/L of dissolved calcium and magnesium, or 5.4 grains per gallon. That is moderately hard water. The number comes from Wagoner CO. RWD #4, dated August 2025.

Catoosa on the hardness scale, with nearby cities
060120180240300360+OK typical 152Broken Arrow: 92 mg/LBroken Arrow 92Coweta: 92 mg/LCoweta 92Bixby: 92 mg/LBixby 92Tulsa: 110 mg/LTulsa 110Sand Springs: 111 mg/LSand Springs 111Claremore: 131 mg/LClaremore 131Jenks: 148 mg/LJenks 148Owasso: 153 mg/LOwasso 153Collinsville: 153 mg/LCollinsville 153Skiatook: 153 mg/LSkiatook 153Catoosa 92mg/L as calcium carbonate060120180240300360+OK 152Broken Arrow: 92 mg/LBroken Arr. 92Tulsa: 110 mg/LTulsa 110Claremore: 131 mg/LClaremore 131Owasso: 153 mg/LOwasso 153Collinsville: 153 mg/LCollinsvil. 153Skiatook: 153 mg/LSkiatook 15392 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 92 mg/L, Catoosa is 60 mg/L below the typical Oklahoma figure of 152. None of the 10 nearest cities we track has softer water. The range nearby runs from 92 mg/L in Broken Arrow to 153 in Owasso.

What 92 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Catoosa

3 people × 75 gallons a day × 5.4 gpg = 1,213 grains a day. A 24,000-grain unit regenerates about every 19 days.

Size it for your household

EPA record for Catoosa's water system

Catoosa · PWSID OK3006629

No health-based violations since 2016

Serves about 2,668 people from surface water.

Health-based
0
Monitoring or reporting
19
Open now
0

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

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 Catoosa water hard?

Somewhat. It measures about 92 mg/L (5.4 grains per gallon), which the USGS classes as moderately hard.

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

About 5.4 gpg. One grain per gallon equals 17.1 mg/L, so 92 mg/L divided by 17.1 gives 5.4.

What size water softener do I need in Catoosa?

For 3 people using 75 gallons each per day, 5.4 gpg works out to about 1,213 grains a day. A 24,000-grain softener covers that with a regeneration about every 19 days.

Has the Catoosa water system had EPA violations?

EPA records show no health-based violations for Catoosa since 2016. There were also 19 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 34 cities in Oklahoma

Hardness data: TapWaterData US Water Hardness (utility report, August 18, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.