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Community Water System · PWS OK3005613

Dewar

Dewar, Oklahoma 74431 - drinking water served from surface water sources to 917 people, tracked in EPA SDWIS and UCMR5.

917
People served
152
EPA violations
70
Health-based
Untested
UCMR5 result

The verdict

EPA records 152 drinking-water violations at Dewar, 46% of them health-based - below the Oklahoma per-system average.

152
Total EPA violations on record
46%
Health-based (MCL / treatment failure)
917
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Dewar

Dewar is a local-owned community water system that delivers drinking water to 917 residents in Dewar, Oklahoma (Okmulgee County) through 350 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 152 total violations for this system , of which 70 (46%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 70 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is TTHM, recorded in 35 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Oklahoma, EPA tracks 1,262 public water systems serving 3,699,452 people, with 336,706 cumulative violations and 113,804 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 266.8 violations. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%).

Dewar's 152 violations sit below the Oklahoma average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
917
Total Violations
152
Health-Based Violations
70
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
350
County
Okmulgee
School/Daycare
No
MCL Violations
69
Monitoring Violations
70
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 35 2022
Coliform (TCR) MR 28 2014
Total Haloacetic Acids (HAA5) MCL 25 2022
TTHM MR 13 2015
Coliform (TCR) MCL 9 2008
Total Haloacetic Acids (HAA5) MR 9 2014
Revised Total Coliform Rule MON 8 2024
Chlorine MR 8 2024
Lead and Copper Rule MR 4 2013
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Dewar.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID OK3005613 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oklahoma Drinking Water Authority

Oklahoma's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find OK regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Revised Total Coliform Rule MON 8 SDWIS / OK3005613 / 8000
2024 Chlorine MR 8 SDWIS / OK3005613 / 0999
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / OK3005613 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / OK3005613 / 5200
2022 TTHM MCL 35 SDWIS / OK3005613 / 2950
2022 Total Haloacetic Acids (HAA5) MCL 25 SDWIS / OK3005613 / 2456
2015 TTHM MR 13 SDWIS / OK3005613 / 2950
2014 Coliform (TCR) MR 28 SDWIS / OK3005613 / 3100
2014 Total Haloacetic Acids (HAA5) MR 9 SDWIS / OK3005613 / 2456
2013 Lead and Copper Rule MR 4 SDWIS / OK3005613 / 5000
2008 Coliform (TCR) MCL 9 SDWIS / OK3005613 / 3100

How Dewar Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Dewar Oklahoma avg Federal benchmark
Total violations 152 266.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 70 90.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.8% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 917 2,931 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,262 regulated public water systems in Oklahoma.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Dewar water safe to drink? ▼
Dewar (PWS ID: OK3005613) has 152 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 917 people using Surface Water sources.
How many people does Dewar serve? ▼
Dewar serves 917 people in Dewar, Oklahoma. It is a Local-owned system using Surface Water water sources with 350 service connections.
What type of violations does Dewar have? ▼
Dewar has 152 total violations: 70 health-based violations (MCL exceedances or treatment failures), 70 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Dewar water? ▼
No PFAS testing data is available for Dewar under the EPA's UCMR5 monitoring program.
What water source does Dewar use? ▼
Dewar uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.