Trinity Estates Water Users Assn, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 7 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.
Trinity Estates Water Users Assn at a glance
Trinity Estates Water Users Assn serves about 250 people through 58 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: ID4200053; phone on file: 208-590-0969. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 7 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Trinity Estates Water Users Assn is 7 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 7 ppb |
| 2022 | 0 (not detected) |
| 2019 | 4 ppb |
| 2016 | 7 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. Trinity Estates Water Users Assn's 7 ppb sits at the 95th percentile in Idaho and the 95th nationally (higher means more lead).
Nearby utilities
22 other systems share Elmore County; 2 of them have a higher latest lead result than Trinity Estates Water Users Assn. 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) |
| 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 |
| Hamilton Place | 97 | 0 (not detected) |
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 Trinity Estates Water Users Assn 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. The action level is dropping - the 10 ppb rule from 2027.