Tanglewood Ws, CO
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 15 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. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
About Tanglewood Ws
Tanglewood Ws serves about 60 people through 23 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Summit County, Colorado. EPA system ID: CO0159120; phone on file: 970-389-6987. They can tell you what your service line is made of and whether they pay to replace it.
Tanglewood Ws's lead record
That is up 12.5 ppb from 2.5 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Tanglewood Ws is 15 ppb across 21 monitoring periods, none of them over 15 ppb (6 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 15 ppb over 10 |
| 2025 | 2.5 ppb |
| 2025 | 4 ppb |
| 2024 | 4.5 ppb |
| 2024 | 1 ppb |
| 2023 | 4 ppb |
| 2023 | 4 ppb |
| 2022 | 9.5 ppb |
| 2022 | 9 ppb |
| 2021 | 7 ppb |
| 2021 | 9 ppb |
| 2020 | 7 ppb |
| 2020 | 10 ppb |
| 2019 | 14.2 ppb over 10 |
| 2019 | 15 ppb over 10 |
| 2018 | 14 ppb over 10 |
| 2018 | 7.5 ppb |
| 2017 | 12 ppb over 10 |
| 2017 | 11.5 ppb over 10 |
| 2016 | 2.5 ppb |
| 2016 | 9.5 ppb |
How Tanglewood Ws 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. Tanglewood Ws's 15 ppb sits at the 100th percentile in Colorado and the 99th nationally (higher means more lead).
Other water systems in Summit County
22 other systems share Summit County; 0 of them have a higher latest lead result than Tanglewood Ws. 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 |
| Dillon Valley District | 3,063 | 3 ppb |
| Buffalo Mountain Md | 2,650 | 1 ppb |
| East Dillon Wd | 2,501 | 4.2 ppb |
| Keystone Ranch | 670 | 6 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Silverthorne, 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 Tanglewood Ws 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. The lead result guide covers how utilities pick the homes they sample. See what changes at 10 ppb in 2027.