North Tomer Butte W&S District, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 1.21 ppb (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. 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 Tomer Butte W&S District
North Tomer Butte W&S District serves about 259 people through 89 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 Latah County, Idaho. EPA system ID: ID2290010; phone on file: 208-882-4962. They can tell you what your service line is made of and whether they pay to replace it.
North Tomer Butte W&S District's lead record
Against the period ending 2022 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for North Tomer Butte W&S District is 2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.21 ppb |
| 2022 | 2 ppb |
| 2019 | 1 ppb |
| 2016 | 0 (not detected) |
How North Tomer Butte W&S District 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 Tomer Butte W&S District's 1.21 ppb sits at the 57th percentile in Idaho and the 59th nationally (higher means more lead).
Nearby utilities
15 other systems share Latah County; 9 of them have a higher latest lead result than North Tomer Butte W&S District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Moscow Water Dept | 26,000 | 4 ppb |
| University Of Idaho | 8,589 | 5 ppb |
| Genesee City Of | 1,044 | 2.94 ppb |
| Troy City Of | 850 | 5 ppb |
| Potlatch City Of | 812 | 0 (not detected) |
| Juliaetta City Of | 624 | 9.9 ppb |
| Deary City Of | 529 | 0 (not detected) |
| Kendrick City Of | 313 | 1 ppb |
| Bovill Water Dept | 256 | 5.01 ppb |
| Onaway Water And Sewer Assn | 200 | 2 ppb |
Next steps for Moscow, ID
Test your own tap with a certified lab first-draw sample; Moscow, 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 Tomer Butte W&S District 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.