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
151–175 of 537Pawnee Co Rwd #1
OK2005931 · 3,200 served
Chandler
OK1020702 · 3,142 served
Okemah Utilities Authority
OK1020706 · 3,113 served
Muldrow Pwa
OK1020208 · 3,104 served
Rogers Co Rwd # 7
OK3006604 · 3,040 served
Wilburton
OK1020103 · 3,025 served
Haskell Co. Water Company
OK1020301 · 3,000 served
Cotton Co Rwd #2
OK2001702 · 3,000 served
Comanche Co Rwd #4
OK3001654 · 3,000 served
Tishomingo Municipal Authority
OK1010815 · 3,000 served
Joseph Harp Corr Inst
OK2001408 · 3,000 served
Atoka Co. Rws & Swmd #4
OK1010412 · 3,000 served
Payne Co Rw Corp #3
OK3006030 · 3,000 served
Heavener Utility Auth - Psg
OK1020101 · 3,000 served
Atoka
OK1010401 · 2,988 served
Blanchard
OK3004710 · 2,966 served
Sequoyah Co. Rwd #7
OK3006806 · 2,948 served
Mcloud
OK2006301 · 2,939 served
Mangum Pws
OK2002802 · 2,924 served
New Cordell Utility Authority
OK2007502 · 2,903 served
Drumright
OK2001902 · 2,876 served
Lindsay Pwa
OK2002501 · 2,850 served
Roland
OK1020212 · 2,842 served
Watonga
OK2000602 · 2,816 served
Calera Pwa
OK2000702 · 2,815 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