Unit 3 Water Assn, ID
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Unit 3 Water Assn at a glance
Unit 3 Water Assn serves about 350 people through 95 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Jerome County, Idaho. EPA system ID: ID5270025; phone on file: 208-948-0288. 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 2016 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Unit 3 Water Assn is 0 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 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. Unit 3 Water Assn's reported as 0 (not detected) sits at the 27th percentile in Idaho and the 20th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
5 other systems share Jerome County; 3 of them have a higher latest lead result than Unit 3 Water Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Jerome City Of | 13,135 | 3 ppb |
| Hazelton City Of | 899 | 0 (not detected) |
| Eden City Of | 411 | 0 (not detected) |
| North Rim Fairways | 150 | 2 ppb |
| Country Club Estates | 137 | 6 ppb |
Next steps for Jerome, ID
Look up your address in Unit 3 Water Assn's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Unit 3 Water 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. Small systems behave differently: why small systems go over more often.