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
351–375 of 537Panhandle State University
OK2007002 · 1,200 served
Ringling
OK2003404 · 1,200 served
Buffalo
OK2003003 · 1,200 served
Geronimo
OK3001680 · 1,200 served
Goodwell
OK2007005 · 1,198 served
Medford
OK2002704 · 1,172 served
Cyril
OK3000805 · 1,168 served
Pontotoc Co Rwd # 9
OK3006218 · 1,162 served
Murray State College
OK1010816 · 1,150 served
Temple
OK1011306 · 1,146 served
Logan Co Rwd #2
OK2004206 · 1,146 served
Hughes Co. Rwd #2
OK1010414 · 1,145 served
Maud
OK2006302 · 1,136 served
Harmon Water Corp
OK2002902 · 1,132 served
Wagoner Co. Rwd #7 (new)
OK1221626 · 1,110 served
Okarche
OK2003703 · 1,110 served
Grandfield
OK2007103 · 1,110 served
Elmore City Rw Corp
OK3002505 · 1,107 served
Stringtown Pwa
OK3000303 · 1,105 served
Craig Co Rws & Swmd #3
OK2001807 · 1,100 served
Laverne
OK2003002 · 1,097 served
Sequoyah Co. Rwd #5
OK1021775 · 1,075 served
Quinton
OK3006123 · 1,071 served
Hydro Pwa
OK2000812 · 1,060 served
Oakland Pwa
OK3004513 · 1,050 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