Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Adams County | 3 | 3 |
| Alamosa County | 4 | 10 |
| Arapahoe County | 13 | 42 |
| Archuleta County | 2 | 7 |
| Baca County | 9 | 17 |
| Boulder County | 25 | 110 |
| Chaffee County | 8 | 22 |
| Cheyenne County | 2 | 18 |
| Clear Creek County | 2 | 2 |
| Conejos County | 0 | 0 |
| Custer County | 1 | 4 |
| Delta County | 7 | 72 |
| Denver County | 2 | 18 |
| Dolores County | 8 | 15 |
| Douglas County | 19 | 154 |
| Eagle County | 19 | 44 |
| Elbert County | 21 | 39 |
| El Paso County | 0 | 0 |
| Fremont County | 9 | 26 |
| Garfield County | 25 | 111 |
| Grand County | 48 | 253 |
| Gunnison County | 47 | 318 |
| Hinsdale County | 2 | 15 |
| Huerfano County | 8 | 16 |
| Jackson County | 7 | 37 |