Caldwell Housing Authority, ID
Exceeded the action level in the past
Latest 90th-percentile lead: 9 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
Caldwell Housing Authority serves about 1,100 people through 70 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Canyon County, Idaho. EPA system ID: ID3140012; phone on file: 208-459-2232. They can tell you what your service line is made of and whether they pay to replace it.
Caldwell Housing Authority's lead record
That is up 4 ppb from 5 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Caldwell Housing Authority is 44 ppb across 8 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 9 ppb |
| 2025 | 5 ppb |
| 2025 | 8 ppb |
| 2024 | 10 ppb |
| 2024 | 16 ppb over 15 |
| 2022 | 44 ppb over 15 |
| 2019 | 0 (not detected) |
| 2016 | 12 ppb over 10 |
How Caldwell Housing Authority compares
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. Caldwell Housing Authority's 9 ppb sits at the 97th percentile in Idaho and the 97th nationally (higher means more lead).
Nearby utilities
82 other systems share Canyon County; 1 of them has a higher latest lead result than Caldwell Housing Authority. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Nampa City Of | 100,200 | 1 ppb |
| Caldwell City Of | 78,740 | 0 (not detected) |
| Middleton City Of | 13,190 | 2 ppb |
| Parma City Of | 2,250 | 1 ppb |
| Wilder City Of | 1,690 | 5 ppb |
| Greenleaf City Of | 846 | 2 ppb |
| Melba City Of | 648 | 3 ppb |
| Notus City Of | 539 | 2 ppb |
| Shalimar Subd | 370 | 1 ppb |
| Belle Aire Acres 2 | 350 | 1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Caldwell, 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 Caldwell Housing Authority 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. More in what a past exceedance means today.