State Hub
Oklahoma Water Quality
537
Utilities in database
3.6M
Residents served
3
With open violations
161
PFAS monitored
Quick Answer
Oklahoma public drinking water is served by 537 EPA-tracked water systems, providing service to approximately 3.6 million residents through public utilities. 3 of those systems currently have open health-based violations on record in the EPA federal database. 161 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 25% of OK residents use private wells, which fall outside federal utility compliance monitoring.
3 Oklahoma water systems have open health-based violations recorded in EPA SDWIS. An open violation means a contaminant exceeded a federal limit and the violation has not been formally resolved in the federal database. Check individual utility pages for current status.
Open Health-Based Violations in Oklahoma
Records sourced from EPA SDWIS. A record may be under review or resolved at the utility level but not yet updated in federal records. Water Utility Report does not determine whether water is safe to drink.
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.
Highest Risk Utilities
Oklahoma systems with open health-based violations in EPA records.
Safest Large Utilities
Oklahoma systems with no open health violations serving 10,000+ residents.
Utilities in Oklahoma
426–450 of 537Haileyville
OK3006111 · 889 served
Davenport Utility Auth
OK3004104 · 881 served
Tyrone
OK2007013 · 880 served
Mountain View Pwa
OK2003805 · 880 served
West Siloam Springs
OK3002109 · 877 served
Pittsburg Co. Rwd #9 (mcalester)
OK3006107 · 872 served
Garvin Co Rwd #6 (sw Purchase)
OK3002515 · 862 served
Tenkiller Waterworks, Inc.
OK1021756 · 860 served
Seiling
OK2002205 · 860 served
Sentinel Pws
OK3007505 · 859 served
Beckham Co Rwd # 2
OK2000510 · 857 served
Sooner Utilities-valley Brook
OK2005521 · 853 served
Choctaw Co. Rwsg & Swmd #6
OK3001214 · 850 served
Howard Mcleod Correctional Center
OK2000304 · 825 served
Wellston
OK1020724 · 825 served
Bryan Co. Rwd #9
OK2000713 · 820 served
Payne Co Rwd #4
OK3006001 · 820 served
Colcord Pwa
OK2002157 · 819 served
Kansas Public Works Authority
OK2002135 · 802 served
Savanna
OK3006104 · 800 served
Roff
OK2006206 · 800 served
Roger Mills Rwd # 2 (red Star)
OK2006505 · 800 served
Ryan Utilities Authority
OK3003405 · 800 served
Hughes Co. Rwd #5
OK3003204 · 800 served
Welch Pwa
OK2001801 · 800 served
Key Contaminant Concerns in Oklahoma
These contaminants appear most frequently in Oklahoma utility records or pose elevated risk in this region based on EPA data.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always caused by human activity — nitrate is converted in the digestive system to nitrite, which then reacts with hemoglobin to form methemoglobin, a form of hemoglobin that cannot carry oxygen. In the body, nitrite also reacts with amines in food to form N-nitroso compounds (nitrosamines) — known carcinogens classified by the IARC as Group 2A (probable human carcinogens). The United States applies over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination in U.S. groundwater.
EPA limit: 10 mg/L
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.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
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.
EPA limit: 10 ppb
City Water Reports in Oklahoma
Tap water quality pages for Oklahoma cities — violations, PFAS records, utility profiles, and official source links.
Oklahoma PFAS Watchlist — all utilities with official recordsIndependent Water Testing
Find a certified lab in Oklahoma
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Oklahoma labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Oklahoma
Haileyville
Violation history, PFAS records, and official source links
Davenport Utility Auth
Violation history, PFAS records, and official source links
Tyrone
Violation history, PFAS records, and official source links
PFAS monitoring records — Oklahoma
161 water systems in Oklahoma with EPA UCMR 5 records
Active drinking water violations
3 open health-based violations on record — view official EPA SDWIS data
Lead in Oklahoma drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Oklahoma drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Oklahoma
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Oklahoma Drinking Water
Does Oklahoma drinking water have PFAS?
161 Oklahoma water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Oklahoma water utilities have open violations?
3 systems have open health-based violations in EPA SDWIS — search for your utility
How do I test my water in Oklahoma?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from OK tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Oklahoma PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Oklahoma water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Oklahoma Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-22