Wilson Mesa, CO
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Wilson Mesa at a glance
Wilson Mesa serves about 290 people through 65 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in San Miguel County, Colorado. EPA system ID: CO0157950; phone on file: 970-250-2892. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Wilson Mesa is 7.6 ppb across 11 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 2.7 ppb |
| 2022 | 7.6 ppb |
| 2021 | 1.2 ppb |
| 2021 | 1.4 ppb |
| 2020 | 1.2 ppb |
| 2020 | 1.5 ppb |
| 2019 | 6.3 ppb |
| 2018 | 1.8 ppb |
| 2017 | 0 (not detected) |
How Wilson Mesa 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. Wilson Mesa's reported as 0 (not detected) sits at the 16th percentile in Colorado and the 18th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
11 other systems share San Miguel County; 9 of them have a higher latest lead result than Wilson Mesa. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mountain Village Town Of | 9,700 | 1 ppb |
| Telluride Town Of | 7,900 | 1 ppb |
| Norwood Water Commission | 1,700 | 2 ppb |
| Aldasoro Ranch Hoc | 412 | 4.2 ppb |
| Ilium Valley Ws | 322 | 1 ppb |
| Ophir Town Of | 193 | 1.5 ppb |
| San Bernardo Hoa | 132 | 0.9 ppb |
| Elk Run Homeowners Corporation | 125 | 1 ppb |
| Last Dollar Pud | 96 | 11.9 ppb |
| Sawpit Town Of | 59 | 0 (not detected) |
Your move
Look up your address in Wilson Mesa's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Wilson Mesa whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2300 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Small systems behave differently: why small systems go over more often.