OES Engines are stationed throughout the state of California. They are staffed by local jurisdictions when called to service by the governor. Local jurisdictions also use the apparatus on a reserve basis.
| UNIT | DEPARTMET ASSIGNED | REGION | County |
| 230 | ARCADIA FD | 1 | LOS ANGELES |
| 228 | MONROVIA FD | 1 | LOS ANGELES |
| 281 | SIERRA MADRE FD | 1 | LOS ANGELES |
| 264 | LA HABRA HEIGHTS FD | 1 | LOS ANGELES |
| 285 | MONTEBELLO FD | 1 | LOS ANGELES |
| 301 | ANAHEIM FD | 1 | ORANGE |
| 302 | GARDEN GROVE FD | 1 | ORANGE |
| 284 | ORANGE COUNTY FA | 1 | ORANGE |
| 303 | ORANGE COUNTY FA | 1 | ORANGE |
| 272 | ARROYO GRANDE FD | 1 | SAN LUIS OBISPO |
| 275 | ATASCADERO FD | 1 | SAN LUIS OBISPO |
| 274 | MORRO BAY FD | 1 | SAN LUIS OBISPO |
| 271 | SAN LUIS OBISPO CITY FD | 1 | SAN LUIS OBISPO |
| 273 | SAN LUIS OBISPO COUNTY FD | 1 | SAN LUIS OBISPO |
| 282 | CARPINTERIA-SUMMERLAND FPD | 1 | SANTA BARBARA |
| 257 | MONTECITO FPD | 1 | SANTA BARBARA |
| 232 | VENTURA CITY FD | 1 | VENTURA |
| 231 | VENTURA COUNTY FD | 1 | VENTURA |
| 283 | VENTURA COUNTY FD | 1 | VENTURA |
| 227 | ALAMEDA COUNTY FD | 2 | ALAMEDA |
| 300 | EL CERRITO FD | 2 | ALAMEDA |
| 291 | LAWRENCE LIVERMORE LAB FD | 2 | ALAMEDA |
| 290 | MORAGA-ORINDA FPD | 2 | CONTRA COSTA |
| 213 | EUREKA FD | 2 | HUMBOLDT |
| 246 | SOUTH LAKE COUNTY FPD | 2 | LAKE |
| 215 | KENTFIELD FPD | 2 | MARIN |
| 249 | ROSS VALLEY FD | 2 | MARIN |
| 287 | FORT BRAGG FPD | 2 | MENDOCINO |
| 286 | LONG VALLEY FPD | 2 | MENDOCINO |
| 260 | UKIAH FD | 2 | MENDOCINO |
| 252 | NAPA FD | 2 | NAPA |
| 248 | SAN FRANCISCO FD | 2 | SAN FRANCISCO |
| 288 | NORTH COUNTY FA | 2 | SAN MATEO |
| 262 | SAN MATEO COUNTY FD | 2 | SAN MATEO |
| 289 | SANTA CLARA COUNTY FD | 2 | SANTA CLARA |
| 217 | SOUTH SANTA CLARA COUNTY FD | 2 | SANTA CLARA |
| 243 | APTOS/ LA SELVA FPD | 2 | SANTA CRUZ |
| 245 | BENICIA FD | 2 | SOLANO |
| 237 | SUISUN FPD | 2 | SOLANO |
| 244 | VACAVILLE FPD | 2 | SOLANO |
| 250 | SANTA ROSA FD | 2 | SONOMA |
| 209 | SONOMA VALLEY FIRE & RESCUE AUTHORITY | 2 | SONOMA |
| 294 | BUTTE COUNTY FD | 3 | BUTTE |
| 297 | CHICO FD | 3 | BUTTE |
| 256 | WILLOWS RURAL FPD | 3 | GLENN |
| 265 | SUSANVILLE FD | 3 | LASSEN |
| 247 | QUINCY FPD | 3 | PLUMAS |
| 296 | REDDING FD | 3 | SHASTA |
| 207 | LOYALTON FD | 3 | SIERRA |
| 214 | MOUNT SHASTA FD | 3 | SISKIYOU |
| 293 | YUBA CITY FD | 3 | SUTTER |
| 205 | TEHAMA COUNTY FD | 3 | TEHAMA |
| 295 | LINDA FD | 3 | YUBA |
| 258 | EL DORADO COUNTY FPD | 4 | EL DORADO |
| 212 | GEORGETOWN FPD | 4 | EL DORADO |
| 225 | GRASS VALLEY FD | 4 | NEVADA |
| 266 | SOUTH PLACER FPD | 4 | PLACER |
| 220 | AWAITING REASSIGNMENT | 4 | SACRAMENTO |
| 235 | AWAITING REASSIGNMENT | 4 | SACRAMENTO |
| 267 | ELK GROVE CSD FD | 4 | SACRAMENTO |
| 270 | FOLSOM FD | 4 | SACRAMENTO |
| 223 | MANTECA CITY FD | 4 | SACRAMENTO |
| 254 | SACRAMENTO CITY FD | 4 | SACRAMENTO |
| 253 | SACRAMENTO METROPOLITAIN FPD | 4 | SACRAMENTO |
| 268 | SACRAMENTO METROPOLITAIN FPD | 4 | SACRAMENTO |
| 216 | SALINAS RURAL FPD | 4 | SACRAMENTO |
| 233 | STOCKTON FD | 4 | SAN JOAQUIN |
| 269 | WOODBRIDGE FPD | 4 | SAN JOAQUIN |
| 211 | OAKDALE CITY FD | 4 | STANISLAUS |
| 234 | STANISLAUS CONSOLIDATED FPD | 4 | STANISLAUS |
| 208 | WEST STANISLAUS COUNTY FD | 4 | STANISLAUS |
| 226 | LAKE VALLEY FPD | 4 | TAHOE BASIN |
| 236 | NORTH TAHOE FPD | 4 | TAHOE BASIN |
| 251 | UC DAVIS FD | 4 | YOLO |
| 224 | WINTERS FD | 4 | YOLO |
| 276 | CLOVIS FD | 5 | FRESNO |
| 206 | FRESNO CITY FD | 5 | FRESNO |
| 277 | FRESNO COUNTY FPD | 5 | FRESNO |
| 299 | BAKERSFIELD FD | 5 | KERN |
| 280 | KERN COUNTY FD | 5 | KERN |
| 259 | KINGS COUNTY FD | 5 | KINGS |
| 204 | MADERA COUNTY FD | 5 | MADERA |
| 203 | ATWATER FD | 5 | MERCED |
| 279 | MERCED CITY FD | 5 | MERCED |
| 263 | MERCED COUNTY FD | 5 | MERCED |
| 298 | PORTERVILLE FD | 5 | TULARE |
| 278 | TULARE COUNTY FD | 5 | TULARE |
| 242 | IMPERIAL COUNTY FD | 6 | IMPERIAL |
| 312 | CARMEL VALLEY FPD | 6 | MONTEREY |
| 240 | BANNING FD | 6 | RIVERSIDE |
| 238 | CATHEDRAL CITY FD | 6 | RIVERSIDE |
| 241 | CORONA FD | 6 | RIVERSIDE |
| 239 | HEMET FD | 6 | RIVERSIDE |
| 255 | RIVERSIDE FD | 6 | RIVERSIDE |
| 219 | BARSTOW FD | 6 | SAN BERNARDINO |
| 221 | COLTON FD | 6 | SAN BERNARDINO |
| 309 | CREST FOREST FPD | 6 | SAN BERNARDINO |
| 311 | LAKE ARROWHEAD FPD/SBCFD | 6 | SAN BERNARDINO |
| 222 | MONTCLAIR FD | 6 | SAN BERNARDINO |
| 229 | ONTARIO FD | 6 | SAN BERNARDINO |
| 310 | SAN BERNARDINO COUNTY FD | 6 | SAN BERNARDINO |
| 218 | YUCAIPA FD/CDF | 6 | SAN BERNARDINO |
| 305 | EAST COUNTY FPD | 6 | SAN DIEGO |
| 292 | LA MESA FD | 6 | SAN DIEGO |
| 306 | NORTH COUNTY FPD | 6 | SAN DIEGO |
| 308 | POWAY FD | 6 | SAN DIEGO |
| 304 | SAN DIEGO FIRE & LIFE SAFETY | 6 | SAN DIEGO |
| 307 | SAN MIGUEL CONSOLIDATED FPD | 6 | SAN DIEGO |
| 261 | VISTA FD | 6 | SAN DIEGO
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