Hard water in Skiatook, OK
Reported by Washington CO RWD #3 (New,#1) · January 2025
- OK typical
- 152 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Skiatook has about 153 mg/L of hardness, which is 8.9 grains per gallon. On the USGS scale that counts as hard. The number comes from Washington CO RWD #3 (New,#1), dated January 2025.
At 153 mg/L, Skiatook is close to the typical Oklahoma figure of 152 mg/L. None of the 10 nearest cities we track has harder water. The range nearby runs from 88 mg/L in Bartlesville to 153 in Collinsville.
What 153 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 153 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 × 8.9 gpg = 2,014 grains a day. A 24,000-grain unit regenerates about every 11 days.
EPA record for Skiatook's water system
No health-based violations since 2016
Serves about 25,375 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 4
- Open now
- 0
TapWaterData ties Skiatook to this system. EPA's service-area records do not name Skiatook, so check the utility printed on your water bill.
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 Skiatook water hard?
Yes. It measures about 153 mg/L (8.9 grains per gallon), which the USGS classes as hard.
What is the water hardness in Skiatook in grains per gallon?
About 8.9 gpg. One grain per gallon equals 17.1 mg/L, so 153 mg/L divided by 17.1 gives 8.9.
What size water softener do I need in Skiatook?
For 3 people using 75 gallons each per day, 8.9 gpg works out to about 2,014 grains a day. A 24,000-grain softener covers that with a regeneration about every 11 days.
Has the Skiatook water system had EPA violations?
EPA records show no health-based violations for Washington CO RWD #3 (New,#1) since 2016. There were also 4 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Collinsville153 mg/LHard
- Owasso153 mg/LHard
- Catoosa92 mg/LModerately hard
- Tulsa110 mg/LModerately hard
- Sand Springs111 mg/LModerately hard
- Claremore131 mg/LHard
- Broken Arrow92 mg/LModerately hard
- Jenks148 mg/LHard
- Sapulpa111 mg/LModerately hard
- Bartlesville88 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (utility report, January 27, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.