Dayton City Of, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 2 ppb (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Dayton City Of at a glance
Dayton City Of serves about 510 people through 181 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Franklin County, Idaho. EPA system ID: ID6210004; phone on file: 208-747-3589. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Dayton City Of's lead record
Against the period ending 2023 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Dayton City Of is 4 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2 ppb |
| 2023 | 2 ppb |
| 2020 | 4 ppb |
| 2017 | 3 ppb |
Where this result ranks
Of the 763 Idaho systems with a lead result, the median latest reading is 1 ppb; 3 are over 15 ppb right now and 46 have gone over at some point. Dayton City Of's 2 ppb sits at the 70th percentile in Idaho and the 71st nationally (higher means more lead).
Nearby utilities
14 other systems share Franklin County; 3 of them have a higher latest lead result than Dayton City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Preston City Of | 5,591 | 2 ppb |
| Fairview Water Dist | 1,300 | 3 ppb |
| Franklin City Of | 1,000 | 3 ppb |
| Weston City Of | 490 | 1 ppb |
| Clifton City Of | 413 | 1 ppb |
| Whitney Nashville Water Works | 403 | 0 (not detected) |
| Banida Water And Sewer Dist | 180 | 1 ppb |
| Cub River Acres | 180 | 7 ppb |
| Birch Creek Culinary | 120 | 1 ppb |
| Preston Eastside Water Co | 120 | 2 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Dayton, ID 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 City Of 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. Size matters more than most people expect: small vs large water systems.