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
126–150 of 537Grady Co Rwd #6
OK3002603 · 3,930 served
Choctaw Ua
OK2005510 · 3,926 served
Caddo Co Rwd #3
OK2000816 · 3,900 served
Leflore Co. Rwd #18
OK3004009 · 3,870 served
Mccurtain Co. Rwd #1
OK3004806 · 3,842 served
Pawhuska
OK1021301 · 3,800 served
Mayes Co Rwd # 6
OK1021666 · 3,750 served
Spencer
OK2005509 · 3,746 served
Hobart
OK1011502 · 3,746 served
Bristow Municipal Authority
OK2001910 · 3,700 served
Mcintosh Co. Rwd #8 (texanna)
OK1020529 · 3,574 served
Consolidated Rwd #3 Creek Co
OK3001916 · 3,500 served
Dewey Public Works Authority
OK3007402 · 3,490 served
Checotah Pwa
OK1020515 · 3,481 served
Wewoka Public Works Authority
OK1020510 · 3,450 served
Madill
OK1010820 · 3,410 served
Cherokee Co. Rwd #11
OK1221637 · 3,395 served
Rogers Co Rwd # 8
OK3006606 · 3,375 served
Mayes Co Rwd # 5
OK3004616 · 3,360 served
Elgin Pwa
OK2001610 · 3,300 served
Tonkawa
OK2003603 · 3,299 served
Stilwell
OK1020205 · 3,276 served
Cleveland Municipal Authority
OK1021210 · 3,262 served
Stickross Mountain Water Co
OK4001118 · 3,250 served
Vance Afb
OK3002402 · 3,231 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