California restricted materials are pesticides deemed to have a higher potential to cause harm to public health, farm workers, domestic animals, honeybees, the environment, wildlife, or other crops compared to other pesticides. With certain exceptions, restricted materials may be purchased and used only by or under the supervision of a certified commercial or private applicator under a permit issued by the County Agricultural Commissioner (CAC).

The purpose of restricted material permits is to allow our office to evaluate, in advance, the potential effects of the proposed application to the treatment site and surrounding properties and to require site-specific use practices be followed (beyond the label and applicable regulations) to mitigate potentially adverse effects. The CAC may deny permits or require feasible alternatives to be used.

Restricted Material Permits are only issued to the operator of the property or his or her authorized representative. For you to obtain a restricted material permit from our office, you must provide us with the following: 

• A completed restricted material permit application
• A copy of your private or commercial applicator certification
• A signed owner authorization letter (if applicable)
• Maps for each location on the permit, which must include:
  • company/organization name
  • ranch name and ranch number
  • year
  • block ID numbers and acreage/square footage
  • pesticide storage areas
  • section, township, and range (if known)
  • adjacent neighbors
  • wells, and reservoirs
  • north arrow
  • ranch access/entry point
  • cross streets or physical address
  • landmarks (power poles, equipment yards, gates, fences, ditches, trees, etc.)
  • sensitive sites (rivers, schools, hospitals, labor camps, residential areas, endangered species habitats, etc.) within a ¼ mile
• Restricted Material Permit Application
• Owner Authorization Letter
• Restricted Materials Permit Process
• Restricted Material List
• Requisitos Para Materiales Restringidos en California (Spanish) 
• Endangered Species Project DPR
• US EPA Endangered Species Program

The purpose of operator identification numbers (OINs) is to enable tracking of agricultural and commercial uses of pesticides through pesticide use reporting.

OINs are issued by our office to persons wanting to apply pesticides in agricultural areas (agricultural production, parks, golf courses, cemeteries, rights-of-way). OINs are only issued to the property operator or his or her authorized representative.

For you to obtain an Operator Identification Number (OIN) from our office, you will need to provide us with the following:

• A completed OIN application
• A signed owner authorization letter (if applicable)
• Maps for each location on the OIN, which must include:
  • company/organization name
  • ranch name and ranch number
  • year
  • block ID numbers and acreage/square footage
  • pesticide storage areas
  • section, township, and range (if known)
  • adjacent neighbors
  • wells, and reservoirs
  • north arrow
  • ranch access/entry point
  • cross streets or physical address
  • landmarks (power poles, equipment yards, gates, fences, ditches, trees, etc.)
  • sensitive sites (rivers, schools, hospitals, labor camps, residential areas, endangered species habitats, etc.) within a ¼ mile
• OIN Application
• Owner Authorization Letter
• Endangered Species Project DPR
• US EPA Endangered Species Program