Aldasoro Ranch Hoc, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 4.2 ppb (monitoring period 2023-2025). 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.
About Aldasoro Ranch Hoc
Aldasoro Ranch Hoc serves about 412 people through 103 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in San Miguel County, Colorado. EPA system ID: CO0157011; phone on file: 970-728-5191. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Aldasoro Ranch Hoc's lead record
That is down 2.8 ppb from 7 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Aldasoro Ranch Hoc is 7 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.2 ppb |
| 2021 | 7 ppb |
| 2020 | 5.8 ppb |
| 2019 | 2.2 ppb |
| 2018 | 2.6 ppb |
| 2017 | 4.5 ppb |
How Aldasoro Ranch Hoc 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. Aldasoro Ranch Hoc's 4.2 ppb sits at the 91st percentile in Colorado and the 89th nationally (higher means more lead).
Other water systems in San Miguel County
11 other systems share San Miguel County; 1 of them has a higher latest lead result than Aldasoro Ranch Hoc. 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 |
| Ilium Valley Ws | 322 | 1 ppb |
| Wilson Mesa | 290 | 0 (not detected) |
| 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
Test your own tap with a certified lab first-draw sample; Telluride, 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 Aldasoro Ranch Hoc 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. The action level is dropping - the 10 ppb rule from 2027.