Water Hardness in 74136
Tulsa, Oklahoma · Tulsa County
Dataset updated March 9, 2026Matched to 8 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 8 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 74136
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 |
|---|---|---|---|
| Tulsa OK1020418 | surface water | 140 PPM Moderately HardUSGS estimate: 40 PPM | |
| Broken Arrow Municipal Authority OK1021508 | surface water | 140 PPM Moderately HardUSGS estimate: 98 PPM | |
| Sand Springs OK1020420 | surface water | 140 PPM Moderately HardUSGS estimate: 98 PPM | |
| Washington Co Rwd #3 (New,#1) OK1021418 | surface water | 140 PPM Moderately HardUSGS estimate: 98 PPM | |
| Owasso OK3007218 | surface water | 140 PPM Moderately HardUSGS estimate: 98 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 Tulsa, OK (74136).
Frequently Asked Questions
Is the water hard in Tulsa, OK (74136)?
The average water hardness in 74136 is 140 PPM (8.2 GPG), which is classified as moderately hard.
Do I need a water softener in 74136?
With hardness of 140 PPM, a water softener is worth considering for homes in 74136.
Is hard water in 74136 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 74136?
Zip code 74136 in Tulsa, Oklahoma is served by 8 water systems.
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