Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Alameda County | 37 | 641 |
| Alpine County | 7 | 12 |
| Amador County | 5 | 13 |
| Butte County | 15 | 80 |
| Calaveras County | 29 | 116 |
| Colusa County | 9 | 23 |
| Contra Costa County | 61 | 627 |
| Del Norte County | 15 | 66 |
| El Dorado County | 10 | 16 |
| Fresno County | 24 | 66 |
| Glenn County | 12 | 32 |
| Humboldt County | 24 | 105 |
| Imperial County | 33 | 159 |
| Inyo County | 111 | 291 |
| Kern County | 80 | 306 |
| Kings County | 5 | 28 |
| Lake County | 23 | 68 |
| Lassen County | 30 | 110 |
| Los Angeles County | 188 | 1281 |
| Madera County | 21 | 100 |
| Marin County | 53 | 274 |
| Mariposa County | 40 | 104 |
| Mendocino County | 35 | 75 |
| Merced County | 9 | 22 |
| Modoc County | 26 | 39 |