Hammett Haven Apartments, ID
Exceeded the action level in the past
Latest 90th-percentile lead: 10 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
Hammett Haven Apartments serves about 64 people through 9 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Elmore County, Idaho. EPA system ID: ID4200023; phone on file: 208-412-5737. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 5 ppb from 5 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Hammett Haven Apartments is 30 ppb across 6 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 10 ppb |
| 2025 | 5 ppb |
| 2025 | 0 (not detected) |
| 2024 | 30 ppb over 15 |
| 2024 | 3 ppb |
| 2016 | 0 (not detected) |
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. Hammett Haven Apartments's 10 ppb sits at the 98th percentile in Idaho and the 97th nationally (higher means more lead).
Other water systems in Elmore County
22 other systems share Elmore County; 0 of them have a higher latest lead result than Hammett Haven Apartments. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mountain Home, City Of | 14,651 | 0 (not detected) |
| Mountain Home Air Force Base | 7,500 | 4 ppb |
| Glenns Ferry City Of | 1,282 | 0 (not detected) |
| Trinity Estates Water Users Assn | 250 | 7 ppb |
| Mellen Subd Water Dist | 250 | 5 ppb |
| Canyon Creek Mobile Home Park | 243 | 3 ppb |
| Summerwind Water Users | 192 | 0 (not detected) |
| Sawtooth Estates Water Users | 175 | 9 ppb |
| Blue Sage Subdivision | 112 | 0 (not detected) |
| Simplot Livestock Company Grandview | 100 | 2 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Mountain Home, 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 Hammett Haven Apartments 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Why an old exceedance still matters: over the limit before, under it now.