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
326–350 of 537Tulsa Co W Imp Dist #14
OK3007213 · 1,400 served
Panama Pwa
OK3004016 · 1,400 served
Washington Co Rwd #1
OK3007401 · 1,375 served
Waukomis Pwa
OK2002410 · 1,366 served
Beggs
OK1020707 · 1,364 served
Garvin Co Rwd #4
OK3002503 · 1,340 served
Muskogee Co. Rwd #3
OK1020710 · 1,300 served
Delaware Co Rwd #10
OK6002158 · 1,295 served
Rush Springs
OK2002609 · 1,278 served
Pittsburg Co. Rwd #16
OK3006106 · 1,268 served
Buckhorn Rwd #2
OK3005002 · 1,260 served
Geary
OK2000608 · 1,258 served
Barnsdall
OK1021304 · 1,243 served
Okeene
OK2000612 · 1,240 served
Thomas
OK2002001 · 1,238 served
Yale
OK3006039 · 1,227 served
Mooreland
OK2007709 · 1,226 served
Garfield Co Rwd #6
OK2002415 · 1,225 served
Hughes Co. Rwd #1
OK3003201 · 1,225 served
Maysville
OK1010807 · 1,212 served
Shattuck
OK2002304 · 1,200 served
East Central Oklahoma Water Authority
OK1021713 · 1,200 served
Pushmataha Co. Rwd #1
OK3006403 · 1,200 served
Pottawatomie Co Development Auth
OK3006303 · 1,200 served
Sperry
OK3007202 · 1,200 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