State Hub
Oklahoma Water Quality
537
Utilities in database
3.6M
Residents served
25%
On private wells
3
Key contaminants tracked
Drinking Water in Oklahoma
Oklahoma has 537 community water systems serving approximately 3.6 million residents. Primary water sources include surface water. The most commonly reported contaminants include disinfection byproducts, nitrates, arsenic. 25% of Oklahoma residents rely on private wells. DEQ holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Oklahoma
451–475 of 537Wright City Pwa
OK3004811 · 792 served
Pittsburg Co. Rwd #11 (kiowa)
OK3006105 · 790 served
South Coffeyville
OK3005305 · 790 served
Delaware Co Rwd # 12
OK2002170 · 785 served
Muskogee Co. Rwd #4
OK3005104 · 783 served
Cheyenne
OK1010803 · 778 served
Okay Pwa
OK3007351 · 767 served
Kay Co Rwd #5 (dale Water Corp)
OK3003603 · 765 served
Sterling Pwa
OK2001601 · 762 served
Elmore City
OK2002521 · 756 served
Dewey Co Rwd #3
OK2007707 · 755 served
Mccurtain Co. Rwd #2
OK3004814 · 755 served
Delaware Co Rwsg&swm District 11
OK3002157 · 750 served
Ottawa Co Rwd #5
OK2005840 · 750 served
Canadian Co Rwd # 1
OK2000908 · 750 served
Le Ann Water
OK3007407 · 750 served
Okmulgee Co. Rwd #5 (bryant)
OK2005604 · 750 served
Arapaho
OK3002004 · 748 served
Copan Pwa
OK1021417 · 733 served
Kiowa
OK1020611 · 731 served
Pushmataha Co. Rwd #5 (nashoba)
OK3006410 · 725 served
Garber Municipal Authority
OK2002416 · 725 served
Clayton Pwa
OK3006408 · 719 served
Cherokee Co. Rwd #1 (ft Gibson)
OK1021621 · 710 served
Binger Pwa
OK2000803 · 708 served
Key Contaminant Concerns in Oklahoma
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Arsenic
Arsenic (As) occurs naturally in rock and soil, dissolving into groundwater through natural weathering processes. Inorganic arsenic — the form found in drinking water — is a known human carcinogen. The western United States has particularly arsenic-rich geological formations, but elevated levels have been found in 48 states. Arsenic is tasteless and odorless.
Oklahoma Water FAQs
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Data source: Utility data from EPA SDWIS. 537 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22