Tap Water Quality Report
Tap water quality in DAYTON, Ohio
Tap water in DAYTON, Ohio receives a grade of C (70/100) from TapWaterSafety.org. It's served by DAYTON PUBLIC WATER SYSTEM. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in DAYTON's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving DAYTON.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 3.91 ppt, 3914x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 10.3 ppb, 172x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 22.8 ppb, 152x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for DAYTON PUBLIC WATER SYSTEM (system ID OH5703512) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for DAYTON
Filters matched to the specific contaminants in DAYTON's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in DAYTON's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
3.91 ppt | 0.001 | 10.0 | — | — | — | — | 3914× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
10.3 ppb | 0.06 | — | — | — | — | — | 172× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
22.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 152× over |
| Bromodichloromethane Disinfection byproduct |
6.54 ppb | 0.06 | — | — | — | — | — | 109× over |
| Dibromoacetic acid Disinfection byproduct |
2.38 ppb | 0.03 | — | — | — | — | — | 79× over |
| Dibromochloromethane Disinfection byproduct |
6.02 ppb | 0.1 | — | — | — | — | — | 60× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
5.51 ppb | 0.1 | 60.0 | 60 | — | — | — | 55× over |
| Chloroform Disinfection byproduct |
6.76 ppb | 0.4 | — | — | — | — | — | 17× over |
| Dichloroacetic acid Disinfection byproduct |
2.81 ppb | 0.2 | — | — | — | — | — | 14× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
2.64 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 8.8× over |
| Nitrate Inorganic |
0.767 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 5.5× over |
| Nitrate and nitrite Inorganic |
0.705 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 5.0× over |
| Chromium (hexavalent) Heavy metal |
0.0823 ppb | 0.02 | — | — | — | — | — | 4.1× over |
| Bromoform Disinfection byproduct |
1.74 ppb | 0.5 | — | — | — | — | — | 3.5× over |
| Trichloroacetic acid Disinfection byproduct |
0.333 ppb | 0.1 | — | — | — | — | — | 3.3× over |
| 1,4-Dioxane Semi-volatile organic compound |
0.185 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Molybdenum Other |
4.61 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
73.7 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Manganese Heavy metal |
7.55 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
1.3 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.79 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.73 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.531 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.075 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| 2-Methoxyethanol Other |
3.25 ppb | — | — | — | — | — | — | Below guideline |
| cis-1,2-Dichloroethylene Volatile organic compound |
0.0974 ppb | — | 70.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.878 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from DAYTON PUBLIC WATER SYSTEM.
General Contact
Treatment Plant
ZIP codes served
DAYTON's public water systems serve the following ZIP codes: