Middleton City Of, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 2 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. 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.
Middleton City Of at a glance
Middleton City Of serves about 13,190 people through 5,135 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Canyon County, Idaho. EPA system ID: ID3140074; phone on file: 208-585-3133. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2025 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Middleton City Of is 7 ppb across 12 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2 ppb |
| 2025 | 2 ppb |
| 2024 | 3 ppb |
| 2023 | 0 (not detected) |
| 2022 | 7 ppb |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 6 ppb |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
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. Middleton City Of's 2 ppb sits at the 74th percentile in Idaho and the 73rd nationally (higher means more lead).
Nearby utilities
82 other systems share Canyon County; 19 of them have a higher latest lead result than Middleton City Of. 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) |
| Parma City Of | 2,250 | 1 ppb |
| Wilder City Of | 1,690 | 5 ppb |
| Caldwell Housing Authority | 1,100 | 9 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; Middleton, 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 Middleton City Of 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. Size matters more than most people expect: small vs large water systems.