North Fork Water Works, 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.
About North Fork Water Works
North Fork Water Works serves about 64 people through 18 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 Fremont County, Idaho. EPA system ID: ID7220049; phone on file: 208-709-6099. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
North Fork Water Works's lead record
That is up 3 ppb from 2 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for North Fork Water Works is 5 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5 ppb |
| 2025 | 2 ppb |
| 2022 | 2 ppb |
| 2019 | 2 ppb |
| 2016 | 5 ppb |
How North Fork Water Works 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. North Fork Water Works's 5 ppb sits at the 88th percentile in Idaho and the 90th nationally (higher means more lead).
Other water systems in Fremont County
10 other systems share Fremont County; 1 of them has a higher latest lead result than North Fork Water Works. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| St Anthony | 3,606 | 2 ppb |
| Ashton City Of | 1,129 | 0 (not detected) |
| Teton City Of | 735 | 1 ppb |
| Newdale City Of | 340 | 3 ppb |
| Parker City Of | 322 | 1 ppb |
| Shotgun North | 285 | 1 ppb |
| Idjc Juvenile Corrections Center | 280 | 0 (not detected) |
| Shotgun Cherokee Subd 5 | 245 | 13 ppb |
| Aspen Ridge Subd | 204 | 5 ppb |
| Mountain View Court | 40 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Rexburg, 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 North Fork Water Works whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1519 ppb (copper action level 1,300 ppb).
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. The lead result guide covers how utilities pick the homes they sample. The action level is dropping - the 10 ppb rule from 2027.