Dillon Valley District, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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.
Dillon Valley District at a glance
Dillon Valley District serves about 3,063 people through 435 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Summit County, Colorado. EPA system ID: CO0159040; phone on file: 970-306-7233. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 2 ppb from 5 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Dillon Valley District is 10 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3 ppb |
| 2021 | 5 ppb |
| 2020 | 7 ppb |
| 2019 | 10 ppb |
| 2018 | 4 ppb |
| 2017 | 5 ppb |
| 2016 | 2.9 ppb |
How Dillon Valley District 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. Dillon Valley District's 3 ppb sits at the 84th percentile in Colorado and the 82nd nationally (higher means more lead).
Neighbouring systems
22 other systems share Summit County; 7 of them have a higher latest lead result than Dillon Valley District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Breckenridge Town Of | 28,315 | 2 ppb |
| Snake River Wd | 9,900 | 0.9 ppb |
| Silverthorne Town Of | 8,400 | 0 (not detected) |
| Copper Mountain Consolidated Md | 5,785 | 5 ppb |
| Frisco Town Of | 4,495 | 4 ppb |
| Dillon Town Of | 3,254 | 5 ppb |
| Buffalo Mountain Md | 2,650 | 1 ppb |
| East Dillon Wd | 2,501 | 4.2 ppb |
| Keystone Ranch | 670 | 6 ppb |
| Mesa Cortina Wsd | 466 | 2 ppb |
Next steps for Dillon, CO
Test your own tap with a certified lab first-draw sample; Dillon, 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 Dillon Valley District 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.