Zone 1: comprises uninfested counties where HLB has not been detected, there are no contiguous citrus growing regions, and it is not proximate to the border with Mexico.
- Zone 1 Counties: Alpine, Amador, Butte, Calaveras, Colusa, Del Norte, El Dorado, Glenn, Humboldt, Inyo, Lake, Lassen, Mariposa, Mendocino, Modoc, Mono, Napa, Nevada, Plumas, Santa Cruz, Shasta, Sierra, Siskiyou, Sonoma, Sutter, Tehama, Trinity, Tuolumne, and Yuba.
ZONE 2: comprises counties that are partially infested with ACP, HLB has not been detected, a geographical barrier exists between it and adjacent contiguous citrus growing regions (i.e., Zones 4, 5, and 6), a contiguous citrus growing region exists within the zone, sufficient citrus commodity cleaning and packing capacity exists within the zone, and geographical barriers separate it from zones that are heavily infested with ACP and where HLB has been detected (i.e., Zone 6).
- Zone 2 Counties: Fresno, Kern, Kings, Madera, Merced, San Joaquin, Stanislaus, and Tulare
ZONE 3: comprises counties that are partially infested with ACP, HLB has not been detected, a geographical barrier exists between it and adjacent contiguous citrus growing regions (i.e., Zone 2, 3, and 4), a contiguous citrus growing region exists within the zone, sufficient citrus commodity cleaning and packing capacity exists within the zone, and geographical barriers separate it from zones that are heavily infested with ACP (i.e., Zone 4) or where HLB has been detected (i.e., Zone 6).
- Zone 3 Counties: Monterey, San Benito, and San Luis Obispo
ZONE 4: comprises counties that are generally infested with ACP, HLB has not been detected, a geographical barrier exists between it and adjacent contiguous citrus growing regions (i.e., Zones 2, 3, and 4), a contiguous citrus growing region exists within the zone, sufficient citrus commodity cleaning and packing capacity exists within 8 the zone, geographical barriers separate it from Zone 6 where HLB has been detected, and it is not proximate to the border with Mexico.
- Zone 4 Counties: Santa Barbara and Ventura
ZONE 5: comprises counties that are generally infested with ACP, HLB has not been detected, a geographical barrier exists between it and adjacent contiguous citrus growing regions (i.e., Zones 4 and 6), a contiguous citrus growing region exists within the zone, sufficient citrus commodity cleaning and packing capacity exists within the zone, a geographical barrier separates it from Zone 6 where HLB has been detected, and it is proximate to the border with Mexico.
- Zone 5 Counties: Imperial and San Diego Counties, and a Portion of Riverside and San Bernardino Counties
ZONE 6: comprises counties, or portions of counties, that are generally infested with ACP, HLB has been detected in some areas, a geographical barrier exists between it and adjacent contiguous citrus growing regions (i.e., Zones 2, 4, and 5), a contiguous citrus growing region exists within the zone, sufficient citrus commodity cleaning and packing capacity exists within the zone, and it is not proximate to the border with Mexico.
- Zone 6 Counties: Los Angeles and Orange counties and Portions of Riverside, San Bernardino, San Diego and Ventura counties as described in the "ACP Bulk Citrus Zone 6 - Text Description" above.
ZONE 7: comprises counties that are partially infested with ACP, HLB has not been detected, there are no contiguous citrus growing regions, and it is not proximate to the border with Mexico.
- Zone 7 Counties: Alameda, Contra Costa, Marin, Placer, Sacramento, Santa Clara, San Francisco, San Mateo, Solano, Sonoma, and Yolo Counties