Three Mile Water Dist, ID
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 11 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Three Mile Water Dist at a glance
Three Mile Water Dist serves about 2,652 people through 1,061 service connections, which makes it a small system under EPA's size classes. It is under mixed public and private ownership and draws groundwater, in Boundary County, Idaho. EPA system ID: ID1110028; phone on file: 208-267-5166. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 8 ppb from 3 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Three Mile Water Dist is 11 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 11 ppb over 10 |
| 2022 | 3 ppb |
| 2019 | 2 ppb |
| 2018 | 3 ppb |
Against other Idaho systems
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. Three Mile Water Dist's 11 ppb sits at the 98th percentile in Idaho and the 98th nationally (higher means more lead).
Nearby utilities
13 other systems share Boundary County; 0 of them have a higher latest lead result than Three Mile Water Dist. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Bonners Ferry City Of | 3,367 | 0 (not detected) |
| Cabinet Mountains Water Dist | 2,335 | 1 ppb |
| Moyie Springs City Of | 1,123 | 2 ppb |
| Bee Line Water Assn Inc | 533 | 2 ppb |
| Mission Creek Water Assn | 263 | 1 ppb |
| Paradise Valley Water Assn | 250 | 2 ppb |
| Twenty Mile Creek Water Assn | 225 | 5 ppb |
| Skin Creek Water Assn | 200 | 4 ppb |
| Trow Creek Water Assn | 98 | 1 ppb |
| Moravia Water Assn | 80 | 1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Bonners Ferry, 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 Three Mile Water Dist 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. Why sampled homes are the worst-case ones is in the guide to reading the number. This system is in the band the 2027 10 ppb rule changes.