Three Mile Tp, CO
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Three Mile Tp at a glance
Three Mile Tp serves about 50 people through 20 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Garfield County, Colorado. EPA system ID: CO0123742; phone on file: 970-279-1217. They can tell you what your service line is made of and whether they pay to replace it.
Three Mile Tp's lead record
Against the period ending 2021 (0.2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Three Mile Tp is 3.5 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2021 | 0.2 ppb |
| 2020 | 0.3 ppb |
| 2019 | 3.5 ppb |
| 2018 | 2.9 ppb |
| 2017 | 1.6 ppb |
Where this result ranks
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. Three Mile Tp's reported as 0 (not detected) sits at the 2nd percentile in Colorado and the 3rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
52 other systems share Garfield County; 38 of them have a higher latest lead result than Three Mile Tp. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rifle City Of | 9,489 | 1.4 ppb |
| Glenwood Springs City Of | 9,428 | 1 ppb |
| Carbondale Town Of | 6,700 | 1.5 ppb |
| New Castle Town Of | 5,024 | 0 (not detected) |
| Battlement Mesa Md | 4,100 | 2.8 ppb |
| Silt Town Of | 3,536 | 2 ppb |
| Roaring Fork Wsd | 1,912 | 0.7 ppb |
| Parachute Town Of | 1,320 | 2.4 ppb |
| Apple Tree Park | 1,160 | 2.8 ppb |
| Cottonwood Springs Mhp | 750 | 0.6 ppb |
Your move
Look up your address in Three Mile Tp'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 Three Mile Tp 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. Small systems behave differently: why small systems go over more often.