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
251–275 of 537Okmulgee Co. Rwd #4
OK3005602 · 1,913 served
Mcintosh Co. Rwd #5
OK3004939 · 1,900 served
Mcclain Co Rwd # 8
OK2004711 · 1,897 served
Okmulgee Co. Rwd #1
OK3005605 · 1,890 served
Us Army Ammunition Plant
OK1020605 · 1,872 served
Mccurtain Co. Rwd #7
OK3004801 · 1,847 served
Comanche Co Rwd #2
OK2001604 · 1,840 served
Okfuskee Co. Rwd #3
OK3005401 · 1,823 served
Spiro East Water Association
OK3004005 · 1,817 served
Ketchum Pwa Delaware Co System
OK1221638 · 1,805 served
Okla Christian University
OK7005566 · 1,800 served
Leflore Co. Consolidated Rwd #12
OK3004040 · 1,800 served
Mccord Rwd #3
OK3005747 · 1,800 served
Hooker
OK2007006 · 1,788 served
Pawnee Co Rwd #2
OK3005921 · 1,775 served
Kay Co Rwd #1
OK3003605 · 1,765 served
Haskell Pwa-wells
OK2005111 · 1,765 served
Mcintosh Co. Rws & Swmd #9
OK3004907 · 1,761 served
Leflore Co. Rwd #1
OK3004003 · 1,758 served
Sequoyah Co. Rwd #4
OK3006809 · 1,750 served
Pittsburg Co. Rwd #5
OK3006115 · 1,750 served
Jones
OK2005507 · 1,727 served
Muskogee Co. Rwd #7
OK3005103 · 1,710 served
Canadian Co Water Authority
OK3000903 · 1,700 served
Gore Pwa
OK1021773 · 1,688 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