TankCheck / States
State file — CA
Underground storage tanks in California
13,588 registered facilities · 37,630 tanks in service · 41,677 leak records · 2,260 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).
13,588UST facilities
37,630tanks in service
143closed tanks
41,677leak records
2,260open cases
94%cases closed / NFA
California runs 9.5 tanks in service per 10,000 residents (population 39,611,295).
39,379 of its 41,677 reported releases have reached No Further Action. The regulator of record is the
California SWRCB UST Program, which holds the live registration and case files.
Check any California address
Free screening of every registered tank and reported leak within a mile of any address.
Screen an addressBy county
| County | Facilities | Tanks in service | Leak records | Open cases |
|---|
| Alameda County | 552 | 1,503 | 2,540 | 268 |
| Alpine County | 4 | 7 | 16 | 0 |
| Amador County | 28 | 81 | 71 | 3 |
| Butte County | 101 | 298 | 289 | 7 |
| Calaveras County | 32 | 88 | 129 | 4 |
| Colusa County | 18 | 50 | 57 | 2 |
| Contra Costa County | 378 | 1,005 | 903 | 59 |
| Del Norte County | 15 | 46 | 116 | 5 |
| El Dorado County | 81 | 225 | 197 | 12 |
| Fresno County | 371 | 1,039 | 890 | 43 |
| Glenn County | 17 | 55 | 53 | 3 |
| Humboldt County | 87 | 229 | 628 | 31 |
| Imperial County | 89 | 260 | 233 | 25 |
| Inyo County | 29 | 101 | 109 | 6 |
| Kern County | 434 | 1,305 | 905 | 16 |
| Kings County | 86 | 245 | 158 | 9 |
| Lake County | 32 | 95 | 99 | 4 |
| Lassen County | 15 | 47 | 46 | 8 |
| Los Angeles County | 3,148 | 8,546 | 7,499 | 522 |
| Madera County | 76 | 214 | 219 | 8 |
| Marin County | 87 | 225 | 367 | 16 |
| Mariposa County | 37 | 71 | 98 | 6 |
| Mendocino County | 62 | 165 | 424 | 44 |
| Merced County | 113 | 333 | 349 | 35 |
| Modoc County | 9 | 29 | 16 | 3 |
| Mono County | 21 | 63 | 68 | 0 |
| Monterey County | 219 | 562 | 415 | 32 |
| Napa County | 44 | 133 | 343 | 12 |
| Nevada County | 36 | 99 | 224 | 7 |
| Orange County | 938 | 2,513 | 3,016 | 201 |
| Placer County | 140 | 409 | 456 | 11 |
| Plumas County | 20 | 60 | 76 | 5 |
| Riverside County | 704 | 1,984 | 1,358 | 79 |
| Sacramento County | 474 | 1,301 | 1,232 | 72 |
| San Benito County | 23 | 57 | 55 | 0 |
| San Bernardino County | 832 | 2,368 | 1,081 | 43 |
| San Diego County | 996 | 2,858 | 3,079 | 101 |
| San Francisco County | 233 | 502 | 2,167 | 53 |
| San Joaquin County | 266 | 731 | 913 | 73 |
| San Luis Obispo County | 128 | 363 | 275 | 3 |
| San Mateo County | 254 | 687 | 1,338 | 70 |
| Santa Barbara County | 145 | 411 | 656 | 29 |
| Santa Clara County | 614 | 1,627 | 2,635 | 67 |
| Santa Cruz County | 104 | 262 | 366 | 15 |
| Shasta County | 119 | 375 | 354 | 14 |
| Sierra County | 5 | 13 | 16 | 2 |
| Siskiyou County | 32 | 111 | 199 | 7 |
| Solano County | 178 | 490 | 535 | 20 |
| Sonoma County | 166 | 488 | 1,204 | 101 |
| Stanislaus County | 208 | 622 | 465 | 12 |
| Sutter County | 42 | 129 | 107 | 4 |
| Tehama County | 40 | 133 | 148 | 2 |
| Trinity County | 6 | 20 | 77 | 4 |
| Tulare County | 270 | 721 | 503 | 27 |
| Tuolumne County | 31 | 81 | 132 | 13 |
| Ventura County | 261 | 769 | 1,369 | 17 |
| Yolo County | 97 | 294 | 290 | 14 |
| Yuba County | 41 | 132 | 114 | 11 |
Frequently asked questions
How many underground storage tanks are in California?
The EPA UST Finder snapshot lists 13,588 registered UST facilities in California, with 37,630 tanks in service and 143 closed or removed tanks across 58 countys.
How many tank leaks have been reported in California?
41,677 releases are on record statewide. 39,379 (94%) were closed with No Further Action; 2,260 cleanup cases remained open in the snapshot.
Which California county has the most underground storage tanks?
By facility count: Los Angeles (3,148), San Diego (996), Orange (938), San Bernardino (832), Riverside (704). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.