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WaterSafeCheck

Oklahoma Tap Water Quality Report

Water quality grades, lead levels, and violation data for all 771 ZIP codes in Oklahoma

ZIP Codes

771

Health Violations (5yr)

3,730

Avg Safety Score

78.6/100

High Lead Risk ZIPs

55.6%

Overview: Drinking Water in Oklahoma

Drinking water quality in Oklahoma is widely considered to be above the national average, maintaining an impressive composite safety score of 78.6/100 across its 771 monitored ZIP codes. Based on the latest records from the EPA's Safe Drinking Water Information System (SDWIS), a remarkable 41% of ZIP codes in Oklahoma have earned an "A" grade. This reflects strong regulatory compliance, robust municipal water treatment infrastructure, and generally low levels of detected health-based contaminants across most communities in the state.

The state's water infrastructure has experienced significant compliance hurdles recently, logging a staggering 3,730 health-based violations over the past 5-year monitoring window out of 10,231 total violations. When a state registers this volume of health-based violations, it often points to systemic challenges such as aging distribution networks, agricultural runoff affecting groundwater, or underfunded rural water systems. Oklahoma Department of Environmental Quality is responsible for enforcing corrective actions and penalizing systems that repeatedly fail to meet safe drinking water standards.

One of the most pressing concerns for Oklahoma residents is the elevated risk of lead exposure. EPA models and historical monitoring indicate that 55.6% of ZIP codes in Oklahoma are classified as High or Very High risk for lead. This is frequently associated with older housing stock built before the 1986 federal ban on lead pipes and solder. Residents living in older homes should strongly consider having their tap water independently tested and utilizing a certified NSF/ANSI 53 water filter for drinking and cooking.

Surface Water

65.8%

of ZIP codes

Total Violations

10,231

5-year record

Grade A ZIPs

315

41% of state

Grade F ZIPs

1

0% of state

Water Quality Grade Distribution in Oklahoma

How do Oklahoma's 771 ZIP codes stack up by water quality grade?

A
315 ZIP codes41%
B
205 ZIP codes27%
C
233 ZIP codes30%
D
17 ZIP codes2%
F
1 ZIP codes0%

Water Quality by City in Oklahoma

Click any city to view ZIP code-level water quality reports

Oklahoma City

79 ZIPs

A

Tulsa

52 ZIPs

A

Edmond

6 ZIPs

A

Norman

6 ZIPs

B

Ardmore

5 ZIPs

C

Lawton

5 ZIPs

B

Enid

5 ZIPs

A

Stillwater

5 ZIPs

B

Bartlesville

4 ZIPs

C

Broken Arrow

4 ZIPs

C

Duncan

3 ZIPs

C

Claremore

3 ZIPs

B

Muskogee

3 ZIPs

C

Ponca City

3 ZIPs

A

Shawnee

3 ZIPs

C

Chickasha

2 ZIPs

C

Davis

2 ZIPs

A

Yukon

2 ZIPs

B

Altus

2 ZIPs

C

Elk City

2 ZIPs

A

Woodward

2 ZIPs

A

Sapulpa

2 ZIPs

B

Grove

2 ZIPs

C

Miami

2 ZIPs

B

Pryor

2 ZIPs

B

Braggs

2 ZIPs

A

Tahlequah

2 ZIPs

C

Wagoner

2 ZIPs

C

Mcalester

2 ZIPs

C

Atoka

2 ZIPs

C

Durant

2 ZIPs

B

Seminole

2 ZIPs

A

Ada

2 ZIPs

A

Albert

1 ZIP

C

Alex

1 ZIP

C

Amber

1 ZIP

C

Anadarko

1 ZIP

C

Apache

1 ZIP

B

Arcadia

1 ZIP

A

Bethany

1 ZIP

B

🏆 Highest Rated ZIP Codes in Oklahoma

73016Cashion
99/100
A
73073Orlando
99/100
A
73082Rush Springs
99/100
A
73430Burneyville
99/100
A
73432Coleman
99/100
A

⚠ Lowest Rated ZIP Codes in Oklahoma

74536Clayton
37/100
F
74873Tecumseh
40/100
D
74332Big Cabin
41/100
D
74560Pittsburg
46/100
D
74883Wetumka
51/100
D

Common Drinking Water Contaminants in Oklahoma

The following are common regulated contaminants found in Oklahoma drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.

Stage 2 DBP RuleHaloacetic Acids (HAA5)Total Trihalomethanes (TTHM)Fecal ColiformChloriteE. coliArsenicConsumer Confidence Report Rule

Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.

Frequently Asked Questions — Oklahoma Drinking Water

Is tap water generally safe to drink in Oklahoma?+
Yes, for the majority of residents, tap water in Oklahoma is treated, heavily regulated, and safe to drink. However, safety varies significantly by location. Statewide, 315 ZIP codes earn an "A" grade for perfect compliance, while 1 earn an "F" due to historical violations. It is essential to search your specific ZIP code above to view the exact compliance record for your local water utility.
What are the biggest water quality issues in Oklahoma?+
Based on a 5-year analysis of EPA violation data, the primary water quality challenges in Oklahoma include managing 3,730 health-based violations statewide and addressing infrastructure age. Additionally, 55.6% of ZIP codes in the state are rated as having a High or Very High probability of lead exposure risk, which is a key metric residents should monitor.
Who regulates and enforces drinking water standards in Oklahoma?+
Drinking water in Oklahoma is primarily regulated by Oklahoma Department of Environmental Quality under a primacy agreement with the U.S. Environmental Protection Agency (EPA). The EPA sets the federal baseline standards (Maximum Contaminant Levels) through the Safe Drinking Water Act, while Oklahoma Department of Environmental Quality conducts the day-to-day monitoring, issues compliance orders, and enforces penalties against local water systems that fail to meet these standards.
Where does Oklahoma get its drinking water?+
Water sources in Oklahoma vary widely by municipality. Statewide, approximately 65.8% of the monitored ZIP codes rely on surface water sources (such as rivers, lakes, and reservoirs), which require extensive filtration and disinfection. The remaining systems primarily rely on groundwater pumped from underground aquifers, which is naturally filtered but can be susceptible to agricultural runoff or naturally occurring minerals.
How do I find the official water quality report for my home in Oklahoma?+
You can enter your ZIP code in our search box above for a detailed, easy-to-read report based on EPA data. Furthermore, your local water utility is required by federal law to distribute an annual Consumer Confidence Report (CCR) by July 1 of each year. You can contact your utility directly to request this document, which outlines exact contaminant measurements from the previous year.
View All 771 ZIP Codes in Oklahoma

Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.

730017300273003730047300573006730077300873009730107301173012730137301473015730167301773018730197302073021730227302373024730257302673027730287302973030730317303273033730347303673038730397304073041730427304373044730457304773048730497305073051730527305373054730557305673057730587305973061730627306373064730657306673067730687306973070730717307273073730747307573077730787307973080730827308373084730857308673089730907309273093730957309673097730987309973101731027310373104731057310673107731087310973110731117311273113731147311573116731177311873119731207312173122731237312473125731267312773128731297313073131731327313473135731367313773139731407314173142731437314473145731467314773148731497315073151731527315373154731557315673157731597316073162731637316473165731677316973170731727317373178731797318473185731897319073193731947319573196731977319873199734017340273403734257343073432734337343473435734367343773438734397344073441734427344373444734467344773448734497345073451734537345473455734567345873459734607346173463734817348773488734917350173502735037350573506735077352073521735227352373526735277352873529735307353173532735337353473536735377353873539735407354173542735437354473546735477354873549735507355173552735537355473555735567355773558735597356073561735627356473565735667356773568735697357073571735727357373601736207362273624736257362673627736287363273638736397364173642736447364573646736477364873650736517365473655736587365973660736617366273663736647366673667736687366973673737017370273703737057370673716
+ 471 more ZIP codes — please search by city above