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The Department operates Entomology and Plant Pathology Laboratories, which seek to protect consumers by identifying exotic insects (and other invertebrates), invasive weeds and plant pathogens entering Los Angeles County through truck, ship, airfreight, and parcel delivery operations. The laboratories provide rapid and accurate identifications to support the Pest Detection and Pest Exclusion programs and offer identification and information services for Los Angeles County residents, schools, governmental agencies, growers, nursery and pest control operators. Overall, the laboratories process over 8,000 pest specimens submitted annually.

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Contact Us


Headquarters Office
12300 Lower Azusa Road
Arcadia, CA 91006-5872
(626) 575-5471


South Gate Office
11012 South Garfield Ave.
South Gate, CA 90280
(562) 622-0402


Antelope Valley Office
335 E. Ave. K-10
Lancaster, CA 93535
(661) 974-8801


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