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
26–50 of 537Del City
OK1020805 · 22,128 served
Bethany
OK2005519 · 20,307 served
Sapulpa
OK1020404 · 19,702 served
Bixby Public Works Authority
OK3007243 · 18,750 served
Altus
OK1011501 · 18,717 served
Mustang
OK2000922 · 18,576 served
Mcalester Pwa
OK1020609 · 18,206 served
Marshall County Rural Water District #2
OK1010848 · 17,587 served
Jenks Pwa
OK3007201 · 16,924 served
El Reno
OK2000902 · 16,212 served
Chickasha Municipal Authority
OK1010821 · 16,036 served
Claremore
OK1021512 · 15,873 served
Durant Utilities Authority
OK1010601 · 15,545 served
Woodward
OK2007701 · 15,000 served
Tahlequah Pwa
OK1021701 · 14,458 served
Miami
OK2005813 · 13,704 served
Okmulgee Pwa
OK1020708 · 13,495 served
Sequoyah Co. Rwd #8
OK1020210 · 13,460 served
Osu Water Plant
OK1020910 · 13,000 served
Creek Co Rwd # 2
OK3001902 · 12,788 served
Glenpool Water
OK3007223 · 12,500 served
Rogers Co Rwd # 5
OK1021507 · 11,782 served
Guymon
OK2007003 · 11,442 served
Southern Okla Water Corp
OK1010830 · 11,250 served
Weatherford
OK2002002 · 10,833 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