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
476–500 of 537Adair
OK1021613 · 704 served
Ottawa Co Rwd # 2
OK2005804 · 700 served
Osage Co Rws & Swd #3 (braden)
OK3005748 · 700 served
Wayne
OK2004702 · 688 served
Pawnee Co Rwd #3
OK3005911 · 685 served
Adair Co Rwd #5
OK1021770 · 675 served
Vici
OK2002203 · 668 served
Fort Cobb
OK2000810 · 667 served
Verden
OK4002619 · 659 served
Delaware Co Rwd # 3
OK1221615 · 653 served
Ottawa Co Rwd # 4
OK2005801 · 652 served
Luther
OK2005503 · 650 served
Canton
OK2000607 · 650 served
Carney
OK2004104 · 649 served
Alex
OK2002603 · 635 served
Chattanooga Pws
OK2001608 · 627 served
Okmulgee Co. Rwd #21
OK3005607 · 625 served
Union City
OK3000909 · 618 served
Fort Towson
OK2001207 · 611 served
Paoli
OK2002502 · 610 served
Olustee Public Works Authority
OK3003309 · 607 served
Sooner Utilities-tinker Town
OK5005519 · 603 served
Mccurtain Co. Rwd #6 (kiamichi)
OK3004817 · 600 served
Highpoint Mhp
OK2002401 · 600 served
Elm Bend Rwd Inc
OK3005309 · 600 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