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
201–225 of 537Bowlegs Lima Water
OK2006701 · 2,500 served
51 East Water
OK3006003 · 2,500 served
Creek Co Rwd # 5
OK2001994 · 2,500 served
Jay
OK1021674 · 2,482 served
Water Improvement District #3
OK3007221 · 2,475 served
Grady Co Rwd #7 (ninnekah)
OK2002633 · 2,425 served
Porter Pwa
OK3007306 · 2,400 served
Mayes Co Rwd # 3
OK1021640 · 2,400 served
Prague
OK2004101 · 2,395 served
Okmulgee Co. Rwd #20
OK3005606 · 2,377 served
Cache
OK2001607 · 2,371 served
Okmulgee Co. Rwd #7 (nuyaka)
OK3005608 · 2,357 served
Okmulgee Co. Rwd #2 (preston)
OK3005604 · 2,355 served
Comanche Co Rwd #3
OK2001602 · 2,325 served
Colbert Pua
OK2000716 · 2,312 served
Wynnewood Water & Light
OK1010812 · 2,307 served
Hartshorne
OK3006101 · 2,300 served
Cherokee Co. Rwd #3 (grandview)
OK4001117 · 2,300 served
Choctaw Co. Rwd #1
OK2001204 · 2,300 served
Muskogee Co. Rwd #1 (oktaha)
OK3005106 · 2,280 served
Hollis
OK2002901 · 2,264 served
Okfuskee Co. Rwd #2
OK3005402 · 2,250 served
Washington Co Rwd #2
OK3007403 · 2,250 served
Newkirk
OK2003604 · 2,243 served
Pawnee
OK1021209 · 2,230 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