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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
501–525 of 537Johnston Co Rws& Swmd #4
OK2003503 · 600 served
Washington
OK2004703 · 600 served
Calumet
OK2000904 · 600 served
Alfalfa Co Rws & Swmd #1 North
OK2000201 · 600 served
Gans Utility Authority
OK3006802 · 600 served
Mannsville Public Works Authority
OK2003505 · 587 served
Red Oak Pwa
OK1020105 · 581 served
Lahoma Pwa
OK2002417 · 577 served
Lincoln Co Rwd #3
OK3004107 · 575 served
Creek Co Rwd # 4
OK3001920 · 575 served
Hammon
OK3006503 · 568 served
Ramona Public Works Authority
OK3007408 · 564 served
Keota Pwa
OK3003112 · 564 served
Bokchito
OK2000704 · 564 served
Osage Co Rwd # 5
OK3005721 · 561 served
Mccurtain Municipal Authority
OK3003101 · 560 served
Pottawatomie County Rwd #3
OK1020807 · 560 served
Ottawa Co Rwd #6
OK2005859 · 560 served
Depew
OK2001903 · 555 served
Covington
OK3002419 · 553 served
Dibble
OK3004709 · 550 served
Alfalfa Co Rws & Swmd #1
OK2000202 · 550 served
Mayes Co Rwd # 7
OK3004627 · 538 served
Forgan
OK2000406 · 532 served
Cement
OK3000806 · 530 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