Twenty Mile Creek Water Assn, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 5 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. 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.
Twenty Mile Creek Water Assn at a glance
Twenty Mile Creek Water Assn serves about 225 people through 90 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Boundary County, Idaho. EPA system ID: ID1110030; phone on file: 208-267-3105. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 2 ppb from 7 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Twenty Mile Creek Water Assn is 9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5 ppb |
| 2022 | 7 ppb |
| 2019 | 7 ppb |
| 2016 | 9 ppb |
How Twenty Mile Creek Water Assn compares
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. Twenty Mile Creek Water Assn's 5 ppb sits at the 89th percentile in Idaho and the 91st nationally (higher means more lead).
Nearby utilities
13 other systems share Boundary County; 1 of them has a higher latest lead result than Twenty Mile Creek Water Assn. 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) |
| Three Mile Water Dist | 2,652 | 11 ppb |
| 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 |
| Skin Creek Water Assn | 200 | 4 ppb |
| Trow Creek Water Assn | 98 | 1 ppb |
| Moravia Water Assn | 80 | 1 ppb |
What to do in your house
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 Twenty Mile Creek Water Assn 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. The action level is dropping - the 10 ppb rule from 2027.