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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
401–425 of 537Stephens Co Rw&sd #1
OK2006906 · 960 served
Custer County Rwd #3
OK2002040 · 960 served
Pushmataha Co. Rwd #2 (albion)
OK3006402 · 959 served
Mack Alford Correctional Center
OK1010408 · 952 served
Langley
OK1021604 · 950 served
Morrison Public Works Auth.
OK3005205 · 950 served
Talihina Pwa
OK1010304 · 950 served
Caddo
OK2000703 · 944 served
Allen Pwa
OK2006202 · 937 served
Texhoma
OK2007009 · 935 served
Boswell Public Works Authority
OK2001205 · 932 served
Osage Co Rwd # 1
OK3005704 · 930 served
Oakview Water Corp
OK2004506 · 925 served
Mcintosh Co. Rwd #3 (victor)
OK3004903 · 920 served
Woodward Co Rwd #2
OK2007710 · 920 served
Kay County Rural Water District 7
OK3003601 · 920 served
Dewar
OK3005613 · 917 served
Tipton
OK2007101 · 916 served
Canadian Co Rwd # 4
OK2000930 · 907 served
Quapaw
OK2005811 · 906 served
Cashion
OK3003703 · 900 served
Washington Co Rwd #5
OK3007409 · 900 served
Pontotoc Co Rwd # 6 (fittstown)
OK3006222 · 896 served
Blair Public Works Authority
OK2003304 · 894 served
Norge Water and Sewer Co., Inc
OK3002601 · 890 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
Quick Links
Data source: Utility data from EPA SDWIS. 537 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22