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MAYES CO RWD #4

PWS ID: OK3004617 · PRYOR, Oklahoma 74361

MAYES CO RWD #4 serves 4,183 people in PRYOR, Oklahoma using Surface Water water sources. It has 44 recorded EPA violations, including 4 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: MAYES CO RWD #4

MAYES CO RWD #4 is a local-owned community water system that delivers drinking water to 4,183 residents in PRYOR, Oklahoma (Mayes County) through 1,491 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 44 total violations for this system , of which 4 (9%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 16 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 10 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 0.017 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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. MAYES CO RWD #4's 44 violations sit below the Oklahoma average. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
4,183
Total Violations
44
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
1,491
County
Mayes
School/Daycare
No
MCL Violations
3
Monitoring Violations
16
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 10 2025
Coliform (TCR) MR 5 2005
Coliform (TCR) MCL 3 1995
Consumer Confidence Rule Other 2 2024
Total Haloacetic Acids (HAA5) MR 1 2013
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 65 samples detected PFAS.

Contaminant Date Result MRL Status
NFDHA 9/9/2025 <0.02 µg/L 0.02 µg/L Not Detected
ADONA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 9/9/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 9/9/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 9/9/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 9/9/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 9/9/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 9/9/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 9/9/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 9/9/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 9/9/2025 0.0170 µg/L 0.005 µg/L Detected
PFHpS 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 9/9/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 9/9/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 9/9/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 9/9/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFDA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 9/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 9/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 9/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFMPA 9/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 9/23/2025 <0.002 µg/L 0.002 µg/L Not Detected
8:2 FTS 9/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 9/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 9/23/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHpS 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 9/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 9/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 9/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 9/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 9/23/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFHxS 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 9/23/2025 <0.003 µg/L 0.003 µg/L Not Detected

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 MAYES CO RWD #4.

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 OK3004617 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
2025 Lead and Copper Rule MR 10 SDWIS / OK3004617 / 5000
2024 Consumer Confidence Rule Other 2 SDWIS / OK3004617 / 7000
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / OK3004617 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / OK3004617 / 5200
2013 Total Haloacetic Acids (HAA5) MR 1 SDWIS / OK3004617 / 2456
2005 Coliform (TCR) MR 5 SDWIS / OK3004617 / 3100
1995 Coliform (TCR) MCL 3 SDWIS / OK3004617 / 3100

How MAYES CO RWD #4 Compares

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

Metric MAYES CO RWD #4 Oklahoma avg Federal benchmark
Total violations 44 266.8 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 4 90.2 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 60.8% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 4,183 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is MAYES CO RWD #4 water safe to drink? ▼
MAYES CO RWD #4 (PWS ID: OK3004617) has 44 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 4,183 people using Surface Water sources.
How many people does MAYES CO RWD #4 serve? ▼
MAYES CO RWD #4 serves 4,183 people in PRYOR, Oklahoma. It is a Local-owned system using Surface Water water sources with 1,491 service connections.
What type of violations does MAYES CO RWD #4 have? ▼
MAYES CO RWD #4 has 44 total violations: 4 health-based violations (MCL exceedances or treatment failures), 16 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in MAYES CO RWD #4 water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in MAYES CO RWD #4's water supply: PFBA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does MAYES CO RWD #4 use? ▼
MAYES CO RWD #4 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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

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

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial