Water Hardness in Oklahoma City, OK
Oklahoma · 33 zip codes · 18 matched water systems
City avg (weighted): 154 PPM
Dataset updated March 9, 202618 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Oklahoma City, OK Water Hard or Soft?
The displayed hardness for Oklahoma City, OK is 154 PPM (9 GPG) from Oklahoma City, classified as moderately hard. The citywide weighted average is 154 PPM.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
How this city reading is built
This city reading is a weighted rollup across 18 matched water systems and 33 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.
Water Systems in Oklahoma City
These systems are matched to Oklahoma City, OK. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Oklahoma City OK1020902 | surface water | 154 PPM Moderately HardUSGS estimate: 216 PPM | |
| Norman Utilities Authority OK1020801 | surface water | 154 PPM Moderately HardUSGS estimate: 197 PPM | |
| Edmond Pwa OK1020723 | surface water | 154 PPM Moderately HardUSGS estimate: 202 PPM | |
| Midwest City OK1020806 | surface water | 154 PPM Moderately HardUSGS estimate: 216 PPM | |
| Moore Public Works Authority OK2001412 | surface water | 154 PPM Moderately HardUSGS estimate: 197 PPM |
Zip Codes in Oklahoma City, OK
What This Means For You
Use this city reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.
Know your water hardness?
If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Oklahoma City, OK.
Frequently Asked Questions
How hard is the water in Oklahoma City, OK?
The citywide weighted average water hardness in Oklahoma City, OK is 154 PPM (9 GPG), classified as moderately hard. This is based on 18 matched water systems.
Do I need a water softener in Oklahoma City, OK?
With a citywide average hardness of 154 PPM, a water softener is worth considering for homes in Oklahoma City. Confirm your tap reading before sizing equipment.
Is hard water in Oklahoma City, OK safe to drink?
Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.
How many water systems serve Oklahoma City, OK?
Oklahoma City, Oklahoma is served by 18 matched water systems across 33 zip codes.
Learn More About Your Water
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