Water Hardness in 74330
Adair, Oklahoma · Mayes County
Dataset updated March 9, 2026Matched to 5 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 5 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 74330
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 |
|---|---|---|---|
Pryor OK3004611 | surface water | 110 PPM Slightly Hard | |
Mayes Co Rwd # 2 OK3004608 | surface water | 110 PPM Slightly Hard | |
Okla Ordnance Works Authority OK1021602 | surface water | 110 PPM Slightly Hard | |
Mayes Co Rwd # 5 OK3004616 | surface water | 845 PPM Very Hard | |
Adair OK1021613 | surface water | 845 PPM Very Hard |
Nearby Zip Codes
What This Means For You
Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Hard Water - Treatment Recommended
Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How to Test Your Water
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 Adair, OK (74330).
Frequently Asked Questions
Is the water hard in Adair, OK (74330)?
Our estimate for 74330 is 239 PPM (14 GPG), but it is based on nearby, county, or state-level data rather than a direct treated tap-water report for this exact location. Confirm with your utility or a home test.
Do I need a water softener in 74330?
Do not size a softener from this estimate alone. Confirm the actual tap-water hardness before choosing treatment equipment.
Is hard water in 74330 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 74330?
Zip code 74330 in Adair, Oklahoma is served by 5 water systems.
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