Darby Water Assn, ID
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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 Darby Water Assn
Darby Water Assn serves about 58 people through 19 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Teton County, Idaho. EPA system ID: ID7410003; phone on file: 208-313-6121. They can tell you what your service line is made of and whether they pay to replace it.
Darby Water Assn's lead record
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Darby Water Assn is 30 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 30 ppb over 15 |
How Darby 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. Darby Water Assn's reported as 0 (not detected) sits at the 9th percentile in Idaho and the 4th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Teton County
9 other systems share Teton County; 8 of them have a higher latest lead result than Darby Water Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Victor City Of | 2,361 | 4 ppb |
| Driggs City Of | 2,200 | 3 ppb |
| Teton Springs Water And Sewer Company | 924 | 3 ppb |
| Tetonia City Of | 409 | 1 ppb |
| Fox Creek Country Club Estates | 250 | 0 (not detected) |
| Ee Dah How Acres Subd | 69 | 2 ppb |
| Teton Reserve Subdivision & Golf Course | 62 | 2 ppb |
| Grove Creek Subd Water Assn | 30 | 2 ppb |
| Jackalope Assn | 28 | 2 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Driggs, 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 Darby 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. More in what a past exceedance means today.