Definition of prohibited counties: Areas from where APHIS regulated soil should neither be packaged or shipped. Soil received from these counties will be treated as quarantined and destroyed without processing.
Current List of Prohibited Counties:
California: Alameda, Contra Costa, Humboldt, Lake, Los Angeles, Marin, Mendocino, Monterey, Napa, Orange, Riverside, San Diego, San Francisco, San Mateo, Santa Claro, Santa Cruz, Solano, Sonoma, Trinity
Idaho: Bingham, Bonneville
Texas: Cameron, Hidalgo, Willacy
Printable list: cornell-soil-health-laboratory-prohibited-counties