Water Hardness in 73135
Oklahoma City, Oklahoma · Oklahoma County
Dataset updated March 9, 2026Matched to 9 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 9 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.
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 Serving 73135
These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Oklahoma City OK1020902 | surface water | 154 PPM Moderately HardUSGS estimate: 216 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 | |
| Tinker Air Force Base OK2005508 | groundwater | 154 PPM Moderately HardUSGS estimate: 162 PPM | |
| Del City OK1020805 | surface water | 154 PPM Moderately HardUSGS estimate: 216 PPM |
Nearby Zip Codes
What This Means For You
Use this ZIP 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 (73135).
Frequently Asked Questions
Is the water hard in Oklahoma City, OK (73135)?
The average water hardness in 73135 is 154 PPM (9 GPG), which is classified as moderately hard.
Do I need a water softener in 73135?
With hardness of 154 PPM, a water softener is worth considering for homes in 73135.
Is hard water in 73135 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 73135?
Zip code 73135 in Oklahoma City, Oklahoma is served by 9 water systems.
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