- EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
- PFHxS (a PFAS): found in 4 of 8 samples, average 4.2 ppt, highest 9.8 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
- PFOS (a PFAS): found in 4 of 8 samples, average 3.7 ppt, highest 10 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
- PFHxA (a PFAS): found in 4 of 8 samples, average 1.8 ppt, highest 4.4 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
- PFPeA (a PFAS): found in 4 of 8 samples, average 1.7 ppt, highest 4.6 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
- PFBS (a PFAS): found in 1 of 8 samples, average 0.40 ppt, highest 3 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
- Lead, 90th percentile: 470 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, above EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2024–Dec 31, 2026). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink Dayton tap water? What EPA records show
EPA OH5703512 · serves Montgomery County, OH · about 141,407 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Dayton Public Water System (EPA OH5703512)
EPA data as of October 14, 2026. For Dayton's main utility, Dayton Public Water System: We found no health-based violations in EPA's records for this system (OH5703512) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 5. This is public data, not a test of your tap.
What EPA records show for Dayton Public Water System, as of October 14, 2026
We found no health-based violations in EPA's records for this system (OH5703512) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Dayton Public Water System (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 470 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, above EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2024–Dec 31, 2026). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Dayton Public Water System use chloramine?
We didn't find chloramine in Dayton Public Water System's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.