Twin Falls City Of, ID
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Twin Falls City Of at a glance
Twin Falls City Of serves about 56,121 people through 19,273 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Twin Falls County, Idaho. EPA system ID: ID5420058; phone on file: 208-736-1540. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Twin Falls City Of is 2 ppb across 11 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 1 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 1 ppb |
| 2016 | 2 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. Twin Falls City Of's reported as 0 (not detected) sits at the 36th percentile in Idaho and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
12 other systems share Twin Falls County; 4 of them have a higher latest lead result than Twin Falls City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Kimberly City Of | 5,359 | 0 (not detected) |
| Buhl City Of | 4,518 | 0 (not detected) |
| Filer Water Works | 2,858 | 2.77 ppb |
| Hansen City Of | 1,200 | 0 (not detected) |
| Castleford City Of | 275 | 0 (not detected) |
| Kanaka Rapids Ranch Water System Inc | 240 | 0 (not detected) |
| Hollister City Of | 220 | 1 ppb |
| Rock Ledge Estates | 150 | 0 (not detected) |
| Meander Point Subd | 140 | 0 (not detected) |
| Murtaugh City Of | 130 | 0 (not detected) |
Your move
Look up your address in Twin Falls City Of's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Twin Falls 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. Why sampled homes are the worst-case ones is in the guide to reading the number. A zero today does not rule out a jump later - the rules are tightening in 2027.