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
101–125 of 537Lone Grove
OK2001007 · 4,863 served
Pushmataha Co. Rwd #3
OK1010318 · 4,825 served
Murray Co Rwd # 1
OK2005012 · 4,800 served
Holdenville
OK1020803 · 4,732 served
Leflore Co. Rwd #2
OK3004007 · 4,700 served
Fort Gibson
OK1021622 · 4,700 served
Altus Afb
OK3003303 · 4,617 served
Marlow Municipal Authority
OK2006907 · 4,600 served
Tuttle
OK2002608 · 4,500 served
Sayre
OK2000508 · 4,375 served
Wagoner Co. Rwd #9
OK1021527 · 4,363 served
Broken Bow Pwa
OK1010214 · 4,320 served
Wagoner Co. Rwd #5
OK1021528 · 4,251 served
Pontotoc Co Rwd # 8
OK2006215 · 4,250 served
Craig Co Rwd #2
OK3001802 · 4,250 served
Adamson Rwd #8
OK3006112 · 4,221 served
Harrah
OK2005506 · 4,190 served
Mayes Co Rwd #4
OK3004617 · 4,183 served
Muskogee Co. Rwd #5
OK3005107 · 4,135 served
Ketchum Pwa
OK1021612 · 4,025 served
Nichols Hills
OK2005501 · 4,020 served
Okla Ordnance Works Authority
OK1021602 · 4,000 served
Nowata Municipal Authority
OK1021503 · 3,971 served
Frederick
OK1011401 · 3,940 served
Mannford
OK1020909 · 3,935 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