Mill Creek Wia, CO
Exceeded the action level in the past
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. 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.
Mill Creek Wia at a glance
Mill Creek Wia serves about 67 people through 40 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Clear Creek County, Colorado. EPA system ID: CO0210017; phone on file: 970-389-4491. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Mill Creek Wia's lead record
That is up 1.9 ppb from 2 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Mill Creek Wia is 31.5 ppb across 21 monitoring periods, 3 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.9 ppb |
| 2025 | 2 ppb |
| 2025 | 4.5 ppb |
| 2024 | 6 ppb |
| 2024 | 4 ppb |
| 2023 | 3 ppb |
| 2023 | 4 ppb |
| 2022 | 0 (not detected) |
| 2022 | 5 ppb |
| 2021 | 7 ppb |
| 2021 | 11 ppb over 10 |
| 2020 | 1.5 ppb |
| 2020 | 20.2 ppb over 15 |
| 2019 | 2 ppb |
| 2019 | 1.5 ppb |
| 2018 | 6.5 ppb |
| 2018 | 31.5 ppb over 15 |
| 2017 | 11 ppb over 10 |
| 2017 | 7 ppb |
| 2016 | 11.8 ppb over 10 |
| 2016 | 15.9 ppb over 15 |
How Mill Creek Wia compares
Of the 1,025 Colorado systems with a lead result, the median latest reading is 1 ppb; 2 are over 15 ppb right now and 71 have gone over at some point. Mill Creek Wia's 3.9 ppb sits at the 88th percentile in Colorado and the 87th nationally (higher means more lead).
Other water systems in Clear Creek County
10 other systems share Clear Creek County; 3 of them have a higher latest lead result than Mill Creek Wia. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Idaho Springs City Of | 10,432 | 7 ppb |
| Georgetown Town Of | 5,315 | 6 ppb |
| Lookout Mountain Wd | 1,378 | 1 ppb |
| Empire Town Of | 500 | 2 ppb |
| St Marys Glacier Wsd | 451 | 3 ppb |
| Silver Plume Town Of | 180 | 4.5 ppb |
| Excell Lawson Village | 90 | 0 (not detected) |
| Western Inn Mhp | 72 | 0.5 ppb |
| Valli Hi Mhp | 50 | 2 ppb |
| Arapahoe Mhp | 27 | 2.5 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Dumont, CO 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 Mill Creek Wia whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 3530 ppb (copper action level 1,300 ppb).
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.