Drinking water quality · 2024
· Verified
What's in Dayton, OH tap water
18 contaminants were measured in the Dayton, OH water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 18
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- OH
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound above EPA limits in Dayton, OH
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFOS (Perfluorooctane sulfonic acid)
● Over EPA limit (2.5×)near national p90 (19.900000000000006 ng/L across detecting U.S. systems)
PFHxS (Perfluorohexane sulfonic acid)
● Approaching limit (98%)near national p90 (12.049999999999997 ng/L across detecting U.S. systems)
PFHxA
● Detected (no federal limit)below national p90 (12.190000000000003 ng/L across detecting U.S. systems)
PFPeA
● Detected (no federal limit)below national p90 (15.95999999999999 ng/L across detecting U.S. systems)
PFBS
● Detected (no federal limit)below national p90 (13.909999999999979 ng/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Dayton, OH's drinking water comes from ground water under the influence of surface water, drawn from 108 sources.
Source
- DAYTON, CITY OF-OTTAWA P · 51
- DAYTON, CITY OF-MIAMI PL · 33
- DAYTON, CITY OF- OTTAWA PLANT · 10
- DAYTON, CITY OF- MIAMI PLANT · 3
- + 9 more
Treatment
- DAYTON PWS MIAMI PLANT
- DAYTON PWS OTTAWA PLANT
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
1 contaminant historically over EPA limits in Dayton, OH
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
GROSS BETA worst: 2016 | 20 mrem/yr 5.0× | 4 mrem/yr | '15'16'18'19 |
TTHM worst: 2016 | 0.0469 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2012 | 0.0213 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
RADIUM 226 228 worst: 2019 | 1.3 pCi/L within below national p90 | 5 pCi/L | '19 |
FLUORIDE worst: 2017 | 1 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
TCE worst: 2012 | 0.00106 mg/L within | 0.005 mg/L | '12 |
NITRATE worst: 2019 | 1.9 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRITE worst: 2016 | 0.186 mg/L within | 1 mg/L | '16 |
NITRATE NITRITE worst: 2015 | 1.79 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
BARIUM worst: 2015 | 0.0942 mg/L within below national p90 | 2 mg/L | '12'13'14'15'16'17'18'19 |
CIS DICHLOROETHYLENE 12 worst: 2016 | 0.000673 mg/L within below national p90 | 0.07 mg/L | '12'16 |
COPPER worst: 2014 | 0.19 mg/L below national p90 | — | '14'16'17 |
LEAD worst: 2012 | 0.0076 mg/L | — | '12'14'15'16'17 |
DBAA worst: 2012 | 0.0058 mg/L | — | '12'13'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.0059 mg/L | — | '12'13'14'15'16'17'18'19 |
MBAA worst: 2012 | 0.0025 mg/L | — | '12'18 |
MCAA worst: 2012 | 0.0027 mg/L | — | '12'18 |
TCAA worst: 2012 | 0.0044 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.0135 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.00584 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.0133 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.013 mg/L | — | '12'13'14'15'16'17'18'19 |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.23–1.32 mg/LRangeSystem-wide | 4 mg/LMRDL | Within the limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 3.57 ng/LAverageSystem-wide | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 0.62–1 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.088 NTUReported levelSystem-wide | None set | Detected — no federal limit |
People also ask about Dayton, OH's water
+Is Dayton, OH tap water safe to drink in 2024?
Every one of the 18 contaminants measured in Dayton, OH's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Dayton, OH tap water?
18 contaminants were measured in Dayton, OH's 2024 Consumer Confidence Report, spanning disinfection byproducts, pfas ("forever chemicals"), and metals. 8 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Dayton, OH's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Dayton, OH's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.