Grace City Of, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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 Grace City Of
Grace City Of serves about 920 people through 466 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Caribou County, Idaho. EPA system ID: ID6150010; phone on file: 208-425-3533. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 2 ppb from 1 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Grace City Of is 5 ppb across 10 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3 ppb |
| 2025 | 1 ppb |
| 2025 | 2 ppb |
| 2025 | 0 (not detected) |
| 2024 | 2 ppb |
| 2024 | 2 ppb |
| 2023 | 5 ppb |
| 2022 | 3 ppb |
| 2019 | 2 ppb |
| 2016 | 2 ppb |
Where this result ranks
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. Grace City Of's 3 ppb sits at the 80th percentile in Idaho and the 82nd nationally (higher means more lead).
Other water systems in Caribou County
7 other systems share Caribou County; 3 of them have a higher latest lead result than Grace City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Soda Springs City Of | 3,111 | 6 ppb |
| Bancroft City Of | 350 | 11 ppb |
| Bailey Creek Property Owners Assn | 250 | 7 ppb |
| Trout Creek Culinary Water Inc | 90 | 0 (not detected) |
| Valley View Water Assn | 35 | 3 ppb |
| Whiskey Creek Water Users | 35 | 0 (not detected) |
| Evergreen Heights Subd | 25 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Grace, 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 Grace City Of whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1740 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. 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.