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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
1–25 of 537Oklahoma City
OK1020902 · 644,000 served
Tulsa
OK1020418 · 413,000 served
Broken Arrow Municipal Authority
OK1021508 · 116,330 served
Norman Utilities Authority
OK1020801 · 104,868 served
Lawton
OK1011303 · 92,757 served
Edmond Pwa
OK1020723 · 79,408 served
Midwest City
OK1020806 · 55,935 served
Moore Public Works Authority
OK2001412 · 55,083 served
Stillwater Utilities Authority
OK1021220 · 53,000 served
Enid
OK2002412 · 49,347 served
Muskogee
OK1021607 · 38,310 served
Bartlesville
OK1021401 · 34,748 served
Oklahoma University
OK3001414 · 34,000 served
Shawnee Municipal Authority
OK1020504 · 29,990 served
Sand Springs
OK1020420 · 28,774 served
Ponca City Mun Water
OK1021202 · 27,155 served
Wagoner Co. Rwd #4
OK1021529 · 25,792 served
Washington Co Rwd #3 (new,#1)
OK1021418 · 25,375 served
Ardmore
OK1010814 · 24,893 served
Tinker Air Force Base
OK2005508 · 24,645 served
Fort Sill Hqusafacfs
OK3001601 · 23,000 served
Owasso
OK3007218 · 23,000 served
Duncan Public Utilities Authority
OK1010809 · 23,000 served
Ada
OK2006201 · 22,600 served
Yukon
OK2000910 · 22,498 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