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
176–200 of 537Stroud Utilities Authority
OK1020705 · 2,811 served
Grand Lake Pwa
OK1021691 · 2,800 served
Comanche Co Rwd #1
OK3001602 · 2,800 served
Healdton
OK1011102 · 2,785 served
Johnston Co Rwd #3
OK2003511 · 2,783 served
Mcintosh Co. Rws & Swmd #2 (onapa)
OK1020535 · 2,774 served
Eufaula Pwa
OK1020514 · 2,766 served
Rogers Co Rwd # 2
OK3006603 · 2,750 served
Latimer Co. Rwd #1
OK3003904 · 2,750 served
Stigler
OK1020303 · 2,731 served
Fairview
OK2004404 · 2,690 served
Catoosa
OK3006629 · 2,668 served
Jackson Co Water Corp
OK2003306 · 2,662 served
Commerce
OK2005810 · 2,645 served
Marietta Pwa
OK2004301 · 2,626 served
Davis
OK1010822 · 2,610 served
Hinton
OK2000809 · 2,600 served
Adair Co Rwd #3
OK3000106 · 2,598 served
Hominy
OK1021306 · 2,584 served
Mayes Co Rwd # 9
OK1021678 · 2,578 served
Perkins
OK2006012 · 2,572 served
Walters Public Works Authority
OK1011305 · 2,551 served
Muskogee Co. Rwd #6
OK3005105 · 2,550 served
Antlers Pwa
OK1010302 · 2,547 served
Lincoln Co Rw & Sewer Dist 4
OK2004105 · 2,525 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