Oklahoma Water Quality Report 2026

6 cities1,524,393 residentsUpdated March 2026

B82/100State Average
Oklahoma has 6 cities in our database, serving approximately 1,524,393 residents. The average PurityMap score is 82.0/100 (Grade: B), which is 4.1 points above the US average of 77.9/100. Oklahoma City has the cleanest water (82/100) while Oklahoma City scores lowest (82/100) due to lower overall score.
Is Oklahoma Tap Water Safe to Drink?
Safe to Drink

Oklahoma tap water is safe to drink based on our analysis of 6 water systems serving 1,524,393 residents. The average PurityMap score is 82.0/100 (Grade: B), which is 4.1 points above the national average.

  • 6 cities use chloramine or have elevated chlorine residuals. Standard Brita pitchers do not remove chloramine.
Our Recommendation

Oklahoma water is generally good quality. A carbon pitcher or faucet filter removes chlorine taste and provides extra protection. No major filtration investment is needed for most residents.

All 6 cities in Oklahoma meet EPA federal drinking water standards as of 2026. However, EPA standards set legal limits — not health goals. Many contaminants are detected at levels that are legal but may still pose long-term health risks according to independent health organizations like the EWG.
Oklahoma at a Glance
82Avg Purity Score
4.8Avg Hardness (GPG)
Moderate
0Cities with PFAS
0Cities with Hard Water
2.3Avg Lead (ppb)
167Avg TDS (ppm)

Oklahoma is 4.1 points above the US average of 77.9/100. Hardness is 1.5 GPG below the US average of 6.3 GPG.

Best & Worst Water in Oklahoma
Consistent Quality

All 6 cities score similarly

82/100
Score Distribution

How Oklahoma's 6 cities score on the PurityMap 0–100 scale:

Excellent (85–100)
0 cities
Good (70–84)
6 cities
Moderate (60–69)
0 cities
Poor (below 60)
0 cities
Largest Cities in Oklahoma — Water Quality

Water quality for the most populated cities. Click any city for details.







CityPopulationScoreHardnessKey Issues
Oklahoma City681K 82/1005.1 GPG—
Tulsa413K 82/1003.8 GPG—
Norman128K 82/1005.5 GPG—
Broken Arrow114K 82/1003.8 GPG—
Lawton95K 82/1004.8 GPG—
Edmond94K 82/1005.5 GPG—
Hard Water in Oklahoma

Oklahoma generally has soft to moderate water. Average: 4.8 GPG (Moderate). Most residents do not need a softener.

PFAS in Oklahoma Water

Based on EPA UCMR5 data, PFAS have not been detected above advisory levels in any Oklahoma cities in our database as of 2026.

Lead in Oklahoma Water

All Oklahoma cities have lead below 5 ppb. Average: 2.3 ppb. Individual homes with older plumbing may have higher levels.

Water Sources in Oklahoma

Where Oklahoma gets its drinking water, based on 6 water systems.


Source TypeCities% of Total
Surface Water6100%
Recommended Filter for Oklahoma

Oklahoma water is generally good. A carbon pitcher filter improves taste.

All Oklahoma Cities — Ranked
#CityPop.ScoreHardnessLeadPFASTDS
1Oklahoma City681K 82/1005.1 GPG (Moderate)2.5 ppb✅ No180 ppm
2Tulsa413K 82/1003.8 GPG (Moderate)2.2 ppb✅ No130 ppm
3Norman128K 82/1005.5 GPG (Moderate)2.5 ppb✅ No195 ppm
4Broken Arrow114K 82/1003.8 GPG (Moderate)2.0 ppb✅ No130 ppm
5Edmond94K 82/1005.5 GPG (Moderate)2.2 ppb✅ No195 ppm
6Lawton95K 82/1004.8 GPG (Moderate)2.5 ppb✅ No170 ppm
Water Utilities in Oklahoma

Oklahoma has 6 utilities. Major: Oklahoma City Water Utilities, City of Tulsa Water and Sewer, City of Norman Utilities, City of Broken Arrow Public Works, City of Edmond Public Works.

Sources: Canton Hefner Overholser and Stanley Draper lakes, Spavinaw Lake and Lake Oologah, Lake Thunderbird, Lake Oologah via City of Tulsa, Lake Arcadia and OKC blend.

Frequently Asked Questions
Which city has the best water in Oklahoma?
Oklahoma City scores highest at 82/100. Source: Canton Hefner Overholser and Stanley Draper lakes.
Which city has the worst water in Oklahoma?
Oklahoma City scores lowest at 82/100 due to lower overall score.
Is Oklahoma water hard or soft?
Average hardness: 4.8 GPG (Moderate). 1.5 GPG below the US average of 6.3 GPG. 0 of 6 cities have hard/very hard water.
Has PFAS been found in Oklahoma water?
Based on EPA UCMR5 data, PFAS have not been detected above advisory levels in any Oklahoma cities in our database as of 2026.
What water filter should I use in Oklahoma?
Oklahoma water is generally good. A carbon pitcher filter improves taste.
How does Oklahoma water compare to the US average?
Score: 82.0/100 (4.1 points above US avg 77.9). Hardness: 4.8 GPG (1.5 GPG below US avg 6.3).
Where does Oklahoma get its drinking water?Where does Oklahoma get its drinking water?
Oklahoma water comes from: Surface Water: 6 cities (100%).
Data Sources & Methodology
  • EPA Safe Drinking Water Information System
  • EWG Tap Water Database
  • State utility Consumer Confidence Reports
  • USGS regional water monitoring data

PurityMap compiles publicly available data and does not perform independent testing.

How we analyze water Data sources
All Oklahoma Cities with Water Reports

6 city water quality reports available for Oklahoma.

6 Reports
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Showing all 6 cities
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