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
376–400 of 537Nowata Co Rwd #7
OK3005321 · 1,050 served
Meeker Public Works Authority
OK3004108 · 1,044 served
Sequoyah Co. Rwd #3
OK3006804 · 1,040 served
Rogers Co Rwd # 9
OK3006605 · 1,037 served
Washita Co Rwd #2
OK2007511 · 1,032 served
Braggs Water Works
OK2005104 · 1,030 served
Adair Co Rwd #4
OK3000107 · 1,025 served
Fairland Public Works Authority
OK2005809 · 1,025 served
Erick
OK2000502 · 1,023 served
Fletcher
OK2001612 · 1,022 served
Hulbert Pwa
OK1021620 · 1,007 served
Wister
OK3004014 · 1,002 served
Pecan Valley Rwd
OK3001676 · 1,000 served
Muskogee Co. Rwd #2 (gooseneck)
OK3005102 · 1,000 served
Kay Co Rwd #3
OK3003602 · 1,000 served
Major County Rwd #1
OK2004407 · 1,000 served
Okfuskee Co. Rwd #1 (boley)
OK2005402 · 1,000 served
Mccurtain Co. Rwd #9
OK3004820 · 999 served
Oklahoma State Reformatory
OK2002803 · 999 served
Weleetka Public Works Authority
OK1020512 · 998 served
Waynoka
OK2007604 · 993 served
Bryan Co. Rwd #6
OK3000725 · 990 served
Pond Creek
OK2002702 · 982 served
Valliant Pwa
OK3004812 · 971 served
North Blaine Water Corp
OK2000606 · 960 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