Dewey Public Works Authority
EPA ID: OK3007402 · 3,490 people served · 5 ZIP codes
Compliance tracking for Dewey Public Works Authority shows 33 pending violations logged in the EPA system — the supplier delivers water to approximately 3,490 residents while those findings remain open.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2021) to 50 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Dewey Public Works Authority Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The Dewey Public Works Authority serves a community with a median household income of $55,968 and an estimated 49,431 residents across its service area. Approximately 69% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 100% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
Dewey Public Works Authority's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 3% of homes in Washington County, Oklahoma rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Dewey Public Works Authority compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 14 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Total Trihalomethanes (TTHM) at 4 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Fecal Coliform at 21 presence exceeds the EPA maximum of presence.
Contaminant 1019 at 7 mg/L exceeds the EPA maximum of mg/L.
Stage 2 DBP Rule at 6 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 5 detections recorded.
Haloacetic Acids (HAA5) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Oklahoma
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Dewey Public Works Authority (EPA ID: OK3007402) is a community water system in Oklahoma that serves approximately 3,490 people from surface water sources.
This system provides water to 5 ZIP codes across 4 communities.
Average Home Safety Score: C (66/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Resolved |
| June 30, 2025 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| May 1, 2025 | E. coli | Health-based | Unresolved |
| May 1, 2025 | Fecal Coliform | Health-based | Unresolved |
| April 1, 2025 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| April 1, 2025 | E. coli | Health-based | Unresolved |
| April 1, 2025 | Fecal Coliform | Health-based | Unresolved |
| April 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| April 1, 2025 | Total Trihalomethanes (TTHM) | Health-based | Unresolved |
| March 29, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| March 1, 2025 | E. coli | Health-based | Unresolved |
| March 1, 2025 | Fecal Coliform | Health-based | Unresolved |
| February 1, 2025 | Fecal Coliform | Monitoring | Resolved |
| January 1, 2025 | Fecal Coliform | Monitoring | Resolved |
| January 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| January 1, 2025 | Total Trihalomethanes (TTHM) | Health-based | Unresolved |
| January 1, 2025 | Contaminant 1019 | Monitoring | Unresolved |
| December 30, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| December 21, 2024 | Lead and Copper Rule | Monitoring | Unresolved |
| December 1, 2024 | Fecal Coliform | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Fecal Coliform | Microbiological | 21 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 14 | Yes |
| Contaminant 1019 | Other Violation | 7 | No |
| Stage 2 DBP Rule | Treatment Failure | 6 | Yes |
| Lead and Copper Rule | Treatment Failure | 6 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 4 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 4 | No |
| E. coli | Microbiological | 4 | Yes |
| Consumer Confidence Report Rule | Reporting Failure | 3 | No |
| Revised Total Coliform Rule | Microbiological | 3 | No |
| Chlorite | Disinfection Byproducts | 2 | No |
| Surface Water Treatment Rule | Treatment Failure | 2 | No |
| Contaminant 1052 | Other Violation | 1 | No |
Health Risk Details
Haloacetic Acids (HAA5) (EPA limit: 0.06 mg/L)
Cancer risk; reproductive & developmental effects At-risk groups: pregnant women, infants, long-term consumers of chlorinated municipal water.
Removal methods: granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →
Total Trihalomethanes (TTHM) (EPA limit: 0.08 mg/L)
Bladder & rectal cancer risk; reproductive concerns At-risk groups: pregnant women, long-term consumers of chlorinated water, people who frequently shower in chlorinated water.
Removal methods: granular activated carbon (GAC), carbon block filter, point-of-entry aeration. Find the right filter →
E. coli (EPA limit: Zero tolerance (any positive sample triggers immediate action))
Severe GI illness; potentially fatal kidney failure in children At-risk groups: children under 5, elderly, immunocompromised individuals, pregnant women.
Removal methods: UV disinfection (99.99%), chlorination, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by OK or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Dewey Public Works Authority (OK3007402) on EPA.gov.
Frequently Asked Questions
Is Dewey Public Works Authority water safe to drink?
Dewey Public Works Authority has recorded 21 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Dewey Public Works Authority serve?
Dewey Public Works Authority serves approximately 3,490 people across 5 ZIP codes in Oklahoma.
Where does Dewey Public Works Authority get its water?
The primary water source is surface water.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from DEWEY PUBLIC WORKS AUTHORITY Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: DEWEY PUBLIC WORKS AUTHORITY Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Treatment chemicals and what each one does
Chemical names are reported verbatim by the utility. Purpose categories are ZipCheckup annotations based on standard drinking-water treatment practice.
Treatment classification and chemical list sourced from DEWEY PUBLIC WORKS AUTHORITY Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
PFAS Substances Detected in This System
This water system's Consumer Confidence Report disclosed the following PFAS compounds. Levels are from the utility's most recent reporting cycle.
In April 2024, EPA finalized the first National Primary Drinking Water Regulation for six PFAS. Public water systems have until 2029 to comply. EPA — PFAS regulation overview →
Source: Consumer Confidence Report disclosed by DEWEY PUBLIC WORKS AUTHORITY.
ZipCheckup is not affiliated with this water utility. PFAS detection data is sourced from public Consumer Confidence Reports filed by the utility itself.
Notable events and violations
This section summarizes events the utility chose to disclose in its most recent Consumer Confidence Report, plus any federal compliance violations the utility recorded against itself. Both lists are utility-authored — ZipCheckup does not audit, judge, or reorder them.
Federal compliance violations on record
These entries are taken verbatim from the utility's CCR violations section. EPA defines four broad violation categories: Maximum Contaminant Level (MCL), Treatment Technique (TT), Monitoring & Reporting (M&R), and Public Notification (PN).
-
MCL · TTHM2024-01-01 to 2024-03-31
MCL, LRAA
-
MCL · TTHM2024-04-01 to 2024-06-30
MCL, LRAA
-
monitoring · TTHM2024-03-31 to 2024-05-31
FAILURE SUBMIT OEL REPORT FOR TTHM
Violations record from DEWEY PUBLIC WORKS AUTHORITY Consumer Confidence Report.
Notable events from the utility's CCR
These bullet entries are the utility's own narration of operational, regulatory, or infrastructure events during the reporting period.
- TTHM LRAA violations in Q1 and Q2 2024, failure to submit OEL report for TTHM
ZipCheckup note: items above reflect what the utility published in its most recent CCR. Federal violation records are also tracked separately by the EPA Safe Drinking Water Information System (SDWIS) — the SDWIS record is the authoritative federal source for any specific regulatory action.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Dewey Public Works Authority (EPA ID: OK3007402) — request the latest Consumer Confidence Report or ask about specific contaminants.