Hard water in Edmond, OK
Reported by Edmond Pwa · October 2025
- OK typical
- 152 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Edmond has about 135 mg/L of hardness, which is 7.9 grains per gallon. On the USGS scale that counts as hard. The number comes from Edmond Pwa, dated October 2025.
Edmond sits 17 mg/L below the typical Oklahoma figure of 152. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 94 mg/L in Moore to 463 in Mustang.
What 135 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 135 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 × 7.9 gpg = 1,780 grains a day. A 24,000-grain unit regenerates about every 13 days.
EPA record for Edmond's water system
No health-based violations since 2016
Serves about 79,408 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
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 Edmond water hard?
Yes. It measures about 135 mg/L (7.9 grains per gallon), which the USGS classes as hard.
What is the water hardness in Edmond in grains per gallon?
About 7.9 gpg. One grain per gallon equals 17.1 mg/L, so 135 mg/L divided by 17.1 gives 7.9.
What size water softener do I need in Edmond?
For 3 people using 75 gallons each per day, 7.9 gpg works out to about 1,780 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.
Has the Edmond water system had EPA violations?
EPA records show no health-based violations for Edmond Pwa since 2016.
Nearby cities
- The Village134 mg/LHard
- Oklahoma City157 mg/LHard
- Bethany221 mg/LVery hard
- Piedmont123 mg/LHard
- Yukon157 mg/LHard
- Moore94 mg/LModerately hard
- Mustang463 mg/LVery hard
- Norman148 mg/LHard
- Newcastle157 mg/LHard
- El Reno463 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, October 21, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.