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
276–300 of 537Pittsburg Co. Rwd #14
OK1020625 · 1,680 served
Garvin Co Rwd # 6 (wells)
OK2002511 · 1,680 served
Adair Co Rwd #2
OK3000105 · 1,675 served
Langston Pwa
OK1020911 · 1,670 served
Comanche Public Works Authority
OK1011101 · 1,649 served
Leflore Co. Rwd #3
OK3004006 · 1,643 served
Cherokee Co. Rwd #13
OK1021721 · 1,640 served
Carnegie
OK2000805 · 1,637 served
Minco
OK2002610 · 1,632 served
Cherokee
OK2000208 · 1,630 served
Logan Co Rws & Swmd #3
OK2004230 · 1,618 served
Beckham Co Rwd # 3
OK2000547 · 1,617 served
Mccurtain Co. Rwd #5 (hochatown)
OK3004804 · 1,614 served
Stephens Co Rwd #3 (meridian)
OK2006905 · 1,610 served
Wilson Municipal Authority
OK2001001 · 1,600 served
Locust Grove Pwa
OK1021668 · 1,600 served
Kingston Pwa
OK2004501 · 1,600 served
Westville Utility Authority
OK3000109 · 1,596 served
Beckham Co Rwd # 1
OK2000505 · 1,595 served
Leflore Co. Rwd #5
OK3004010 · 1,593 served
Inola Water Works Inc
OK3006612 · 1,589 served
Consolidated Rwd #1 Nowata and Rogers Co
OK3005301 · 1,580 served
Stratford
OK2002503 · 1,575 served
Garvin Co Rwd #2
OK2002514 · 1,570 served
Beaver
OK2000404 · 1,570 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