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
426–450 of 537Haileyville
OK3006111 · 889 served
Davenport Utility Auth
OK3004104 · 881 served
Tyrone
OK2007013 · 880 served
Mountain View Pwa
OK2003805 · 880 served
West Siloam Springs
OK3002109 · 877 served
Pittsburg Co. Rwd #9 (mcalester)
OK3006107 · 872 served
Garvin Co Rwd #6 (sw Purchase)
OK3002515 · 862 served
Tenkiller Waterworks, Inc.
OK1021756 · 860 served
Seiling
OK2002205 · 860 served
Sentinel Pws
OK3007505 · 859 served
Beckham Co Rwd # 2
OK2000510 · 857 served
Sooner Utilities-valley Brook
OK2005521 · 853 served
Choctaw Co. Rwsg & Swmd #6
OK3001214 · 850 served
Howard Mcleod Correctional Center
OK2000304 · 825 served
Wellston
OK1020724 · 825 served
Bryan Co. Rwd #9
OK2000713 · 820 served
Payne Co Rwd #4
OK3006001 · 820 served
Colcord Pwa
OK2002157 · 819 served
Kansas Public Works Authority
OK2002135 · 802 served
Savanna
OK3006104 · 800 served
Roff
OK2006206 · 800 served
Roger Mills Rwd # 2 (red Star)
OK2006505 · 800 served
Ryan Utilities Authority
OK3003405 · 800 served
Hughes Co. Rwd #5
OK3003204 · 800 served
Welch Pwa
OK2001801 · 800 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