Mile High Wc, CO
Exceeded the action level in the past
Latest 90th-percentile lead: 3 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 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
Mile High Wc serves about 700 people through 283 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws surface water, in Adams County, Colorado. EPA system ID: CO0101510; phone on file: 303-466-6373. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 3 ppb from 0 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Mile High Wc is 17 ppb across 12 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3 ppb |
| 2024 | 0 (not detected) |
| 2023 | 4 ppb |
| 2022 | 14 ppb over 10 |
| 2021 | 1.5 ppb |
| 2021 | 2 ppb |
| 2020 | 1.8 ppb |
| 2020 | 3.3 ppb |
| 2019 | 17 ppb over 15 |
| 2018 | 2.3 ppb |
| 2017 | 5.4 ppb |
| 2016 | 1.1 ppb |
Against other Colorado systems
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. Mile High Wc's 3 ppb sits at the 83rd percentile in Colorado and the 82nd nationally (higher means more lead).
Other water systems in Adams County
62 other systems share Adams County; 5 of them have a higher latest lead result than Mile High Wc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Thornton City Of | 226,465 | 2.3 ppb |
| Westminster City Of | 202,078 | 1.3 ppb |
| South Adams County Wsd | 75,559 | 0 (not detected) |
| Brighton City Of | 56,304 | 2 ppb |
| Northglenn City Of | 48,927 | 1.7 ppb |
| Crestview Wsd | 23,756 | - |
| North Washington Street Wsd | 14,500 | - |
| Federal Heights City Of | 11,678 | 1.7 ppb |
| Todd Creek Village Md | 7,363 | 0.8 ppb |
| Bennett Town Of | 4,400 | 1 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Broomfield, 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 Mile High Wc 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.