Dayton Public Water System
EPA ID: OH5703512 · 141,407 people served · 54 ZIP codes
In the current EPA monitoring period, Dayton Public Water System has 2 violations still listed as unresolved, with the utility supplying water to approximately 141,407 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Dayton Public Water System Source: EPA SDWIS service area boundaries.
Service area boundary — Grade F
Service Area Demographics
The Dayton Public Water System serves a community with a median household income of $72,570 and an estimated 564,527 residents across its service area. Approximately 80% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 39% 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?
Dayton Public Water System'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 1% of homes in Greene County, Ohio 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 78th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Dayton Public Water System compares to EPA limits
What This Means For You
Stage 2 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 1 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. 140 detections recorded. 34 exceed federal EPA limits (4 ppt for PFOA/PFOS). 1 exceeds state limits.
Comparable Water Systems
Similar-sized systems in Ohio
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
DAYTON PUBLIC WATER SYSTEM (EPA ID: OH5703512) is a community water system in Ohio that serves approximately 141,407 people from surface water sources.
This system provides water to 54 ZIP codes across 6 communities.
Average Home Safety Score: F (37/100)
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 |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| July 1, 2024 | Surface Water Treatment Rule | Monitoring | Unresolved |
| January 1, 2023 | Stage 1 DBP Rule | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Stage 2 DBP Rule | Treatment Failure | 2 | Yes |
| Surface Water Treatment Rule | Treatment Failure | 2 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 45400 | 0.47 mg/L | Yes | N/A |
| 45401 | 0.47 mg/L | Yes | N/A |
| 45402 | 0.47 mg/L | Yes | N/A |
| 45403 | 0.47 mg/L | Yes | N/A |
| 45404 | 0.47 mg/L | Yes | N/A |
| 45405 | 0.47 mg/L | Yes | N/A |
| 45406 | 0.47 mg/L | Yes | N/A |
| 45408 | 0.47 mg/L | Yes | N/A |
| 45409 | 0.47 mg/L | Yes | N/A |
| 45410 | 0.47 mg/L | Yes | N/A |
| 45412 | 0.47 mg/L | Yes | N/A |
| 45413 | 0.47 mg/L | Yes | N/A |
| 45414 | 0.47 mg/L | Yes | N/A |
| 45415 | 0.47 mg/L | Yes | N/A |
| 45416 | 0.47 mg/L | Yes | N/A |
| 45417 | 0.47 mg/L | Yes | N/A |
| 45418 | 0.47 mg/L | Yes | N/A |
| 45419 | 0.47 mg/L | Yes | N/A |
| 45420 | 0.47 mg/L | Yes | N/A |
| 45422 | 0.47 mg/L | Yes | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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: 24 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 30 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 54 ZIP codes:
45301 · 45309 · 45315 · 45322 · 45324 45400 · 45401 · 45402 · 45403 · 45404 45405 · 45406 · 45408 · 45409 · 45410 45412 · 45413 · 45414 · 45415 · 45416 45417 · 45418 · 45419 · 45420 · 45422 45423 · 45424 · 45426 · 45427 · 45428 45429 · 45430 · 45431 · 45432 · 45433 45434 · 45435 · 45437 · 45439 · 45440 45441 · 45448 · 45449 · 45454 · 45458 45459 · 45463 · 45469 · 45470 · 45475 45479 · 45481 · 45482 · 45490
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Dayton Public Water System (OH5703512) on EPA.gov.
Frequently Asked Questions
Is Dayton Public Water System water safe to drink?
Dayton Public Water System has recorded 1 health-based violation 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 Dayton Public Water System serve?
Dayton Public Water System serves approximately 141,407 people across 54 ZIP codes in Ohio.
Where does Dayton Public Water System 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 City of Dayton Department of Water 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: City of Dayton Department of Water Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
The Ohio EPA conducted a source water assessment of Dayton's water source. The assessment concluded that the aquifer supplying water to the City of Dayton's well fields has a high susceptibility to contamination.
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 City of Dayton Department of Water 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 City of Dayton Department of Water.
ZipCheckup is not affiliated with this water utility. PFAS detection data is sourced from public Consumer Confidence Reports filed by the utility itself.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
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
Dayton Public Water System (EPA ID: OH5703512) — request the latest Consumer Confidence Report or ask about specific contaminants.