The Underground Storage Tank (UST) program of the Los Angeles County Public Works, Environmental Programs Division permits and inspects underground storage tanks within the unincorporated areas of Los Angeles County and 77 cities.

Los Angeles County Code, Title 11, Division 4, established the UST program in 1983. The Los Angeles County UST program’s goal is to protect public health and safety and the environment by ensuring that UST facilities are permitted, designed, installed, modified, operated, and eventually closed in compliance with Local, State, and Federal regulations.

If you have any questions, please email or contact our public counter at (626) 458-3517.

An inspector performs an underground storage tank inspection.

Contact Us


LA County Public Works Headquarters
900 S. Fremont Avenue Alhambra, CA 91803

Los Angeles County Public Works
Environmental Programs Division
900 South Fremont Avenue
Annex Building, 3rd Floor
Alhambra, CA 91803

Public Counter: (626) 458-3517
Fax: (626) 458-3569
TDD: (626) 282-7829

The public counter is open Monday through Thursday 7:00 a.m. to 5:00 p.m. For general inquiries, please email or contact our public counter at (626) 458-3517.

Field Facilities

UST inspectors are available Monday through Friday 8:00 a.m. to 9:30 a.m. unless otherwise noted.

2535 Commerce Way
Commerce, CA 90040
(323) 887-4456

Open Monday through Thursday

4801 East 3rd Street
Los Angeles, CA 90022
(323) 881-7031

24320 South Narbonne Avenue
Lomita, CA 90717
(310) 534-4862

125 South Baldwin Avenue
Arcadia, CA 91007
(626) 574-0962

23757 West Valencia Boulevard
Santa Clarita, CA 91355
(661) 222-2953

13523 East Telegraph Road
Whittier, CA 90605
(562) 906-8426

Report Fraud

If you suspect fraud or wrongdoing by a County employee, please report it to the County Fraud Hotline at 1-800-544-6861 or You may remain anonymous.