Iona Water Dept, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2024-2026). 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 Iona Water Dept
Iona Water Dept serves about 2,717 people through 1,000 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 Bonneville County, Idaho. EPA system ID: ID7100041; phone on file: 208-523-5600. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2023 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Iona Water Dept is 1 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1 ppb |
| 2023 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 1 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. Iona Water Dept's 1 ppb sits at the 55th percentile in Idaho and the 54th nationally (higher means more lead).
Nearby utilities
32 other systems share Bonneville County; 14 of them have a higher latest lead result than Iona Water Dept. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Idaho Falls City Of | 69,450 | 3 ppb |
| Falls Water Company Inc | 22,650 | 3 ppb |
| Ammon City Of | 17,338 | 0 (not detected) |
| Comore Loma | 1,626 | 1 ppb |
| Ucon City Of | 1,161 | 0 (not detected) |
| 3d Water Association | 680 | 1 ppb |
| Taylor Mountain Water And Sewer District | 600 | 0 (not detected) |
| J And K Water Corp | 370 | 3 ppb |
| Blackhawk Estates/Iron Rim | 270 | 3 ppb |
| Country Life Estates | 250 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Iona, 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 Iona Water Dept 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. The lead result guide covers how utilities pick the homes they sample. The action level is dropping - the 10 ppb rule from 2027.