Meridian Water Dept, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 3.9 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. 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.
Meridian Water Dept at a glance
Meridian Water Dept serves about 152,070 people through 48,842 service connections, which makes it a very large system under EPA's size classes. It is privately owned and draws groundwater, in Ada County, Idaho. EPA system ID: ID4010097; phone on file: 208-985-1200. They can tell you what your service line is made of and whether they pay to replace it.
Meridian Water Dept's lead record
Against the period ending 2025 (3.6 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Meridian Water Dept is 9 ppb across 31 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.9 ppb |
| 2025 | 3.6 ppb |
| 2025 | 2.5 ppb |
| 2024 | 2 ppb |
| 2024 | 1.8 ppb |
| 2023 | 3.4 ppb |
| 2023 | 3.4 ppb |
| 2023 | 1.5 ppb |
| 2023 | 1.5 ppb |
| 2022 | 1.8 ppb |
| 2022 | 1.8 ppb |
| 2022 | 1.3 ppb |
| 2022 | 1.3 ppb |
| 2021 | 1 ppb |
| 2021 | 1 ppb |
| 2021 | 1.1 ppb |
| 2021 | 1.1 ppb |
| 2020 | 1.7 ppb |
| 2020 | 1.7 ppb |
| 2020 | 1.6 ppb |
| 2020 | 1.6 ppb |
| 2019 | 2.6 ppb |
| 2019 | 2.6 ppb |
| 2019 | 3 ppb |
| 2019 | 3 ppb |
| 2018 | 4 ppb |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
| 2016 | 9 ppb |
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. Meridian Water Dept's 3.9 ppb sits at the 83rd percentile in Idaho and the 87th nationally (higher means more lead).
Nearby utilities
52 other systems share Ada County; 8 of them have a higher latest lead result than Meridian Water Dept. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Veolia Water Idaho | 264,978 | 2 ppb |
| Kuna City Of | 32,038 | 0 (not detected) |
| Star Sewer And Water Dist Water System | 14,000 | 1 ppb |
| Garden City Water And Sewer System | 12,500 | 1 ppb |
| Capitol Water Corp | 9,000 | 3 ppb |
| Eagle, City Of (Western Zone) | 6,108 | 1 ppb |
| Eagle, City Of (Eastern Zone) | 3,702 | 4 ppb |
| Idoc Sbx Complex | 3,309 | 0 (not detected) |
| Idoc Idaho State Correctional Center | 2,204 | 0 (not detected) |
| Dry Creek Water Company Llc | 1,658 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Meridian, 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 Meridian Water Dept 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. Systems that went over once often dip back under; here is what that means.