Dayton Public Water System, OH
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Dayton Public Water System
Dayton Public Water System serves about 141,407 people through 50,351 service connections, which makes it a very large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Montgomery County, Ohio. EPA system ID: OH5703512; phone on file: 937-333-6099. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Dayton Public Water System's lead record
That is down 470 ppb from 470 ppb in the period ending 2026. The highest 90th-percentile result EPA holds for Dayton Public Water System is 470 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2026 | 470 ppb over 15 |
| 2023 | 0 (not detected) |
| 2020 | 4 ppb |
| 2017 | 3.8 ppb |
How Dayton Public Water System compares
Of the 1,079 Ohio systems with a lead result, the median latest reading is 0.7 ppb; 1 are over 15 ppb right now and 27 have gone over at some point. Dayton Public Water System's reported as 0 (not detected) sits at the 45th percentile in Ohio and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
21 other systems share Montgomery County; 15 of them have a higher latest lead result than Dayton Public Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Montgomery County Water Services 1 Pws | 150,207 | 0 (not detected) |
| Montgomery County Water Services 2 Pws | 83,033 | 0 (not detected) |
| Huber Heights Public Water System | 43,439 | 0 (not detected) |
| Miamisburg City Pws | 19,790 | 1.4 ppb |
| Englewood City Pws | 13,463 | 2.3 ppb |
| Oakwood City Pws | 9,572 | 3.6 ppb |
| Trotwood City Pws | 9,000 | 0 (not detected) |
| West Carrollton City Pws | 8,361 | 0.4 ppb |
| Union City Pws | 7,000 | 3.5 ppb |
| Brookville Municipality Pws | 5,923 | 1.1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Dayton, OH may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Dayton Public Water System whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Why an old exceedance still matters: over the limit before, under it now.