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
226–250 of 537Pittsburg Co. Pwa (crowder)
OK1020603 · 2,203 served
Spiro
OK1020106 · 2,200 served
Arkoma
OK3004013 · 2,180 served
Hughes Co. Rwd #6 (gerty)
OK2003224 · 2,180 served
Creek Co Rwd # 7
OK1020405 · 2,100 served
Waurika Public Works Authority
OK1011201 · 2,100 served
Chouteau
OK3004615 · 2,100 served
Tinker Afb Family Housing
OK8005550 · 2,100 served
Noble County Rwd #2
OK3005203 · 2,100 served
Lexington
OK2001409 · 2,086 served
Hennessey
OK2003704 · 2,058 served
Burns Flat Pws
OK2007505 · 2,057 served
Krebs Utility Authority
OK1020606 · 2,051 served
Pittsburg Co. Rwd #7 (arpelar)
OK3006108 · 2,040 served
Warner
OK1020409 · 2,020 served
Coalgate Pwa
OK1010402 · 2,005 served
Western Carter Co Water Corp
OK2001003 · 2,000 served
Thackerville
OK2004303 · 2,000 served
Wagoner Co. Rwd #2
OK1021643 · 2,000 served
Adair Co Rwd #1 (cherry Tree)
OK3000104 · 2,000 served
Goldsby Water Auth Trust
OK2004707 · 2,000 served
Indianola Rwd #18
OK3006110 · 2,000 served
Garfield Co Rwd #5
OK2002444 · 1,980 served
Chelsea Economic Dev. Auth.
OK1021504 · 1,964 served
Peggs Water Company
OK1221630 · 1,925 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
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Data source: Utility data from EPA SDWIS. 537 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22