The following list was very generously provided by Southern California Gas Company. Please be advised that alternative fuel conversions must be CARB-certified for 1976 and newer vehicles. See California Conversion FAQ for more information.

Conversion Shop
Contact
A1 Auto Electric
(Vehicle Conversion & Retrofit)
2305 Stanislaus Street
Fresno, CA 93721
559-485-4427
AFT / Alternative Fuel Technology
(Vehicle Conversion)
17092 Gothard Street
Huntington Beach, CA 92647
714-842-3017
714-842-7378 (fax)
AFV Fleet Service
(Vehicle Conversion & Repower)
14642 Rancho Vista Drive
Fontana, CA 92335
909-350-7500
909-466-7748 (fax)
BAF Technologies (Head Office)
(Vehicle Conversion & Retrofit)
2415 Beatrice Street
Dallas, TX 75208
214-231-1450
Baytech Corp.
(Vehicle Conversion)
PO Box 1148
Los Altos, CA 94023
650-949-1976
650-949-1970 (fax)
Citizen Automotive
(CNG Repair Only)
2129 W Rosecrans Ave
Gardena, CA 90249-2933
310-768-1574
Complete Coach Works
(Heavy-Duty Vehicle Conversion & Retrofit)
1863 Service Court
Riverside, CA 92507
951-684-9585
951-684-2088 (fax)
Daytech Auto 1249 Illinois Street, #2
Fairfield, CA 94533
707-429-5009
Diversified Truck Center
(Heavy-Duty Vehicle Conversion)
3777 DeForest Circle
Mira Loma, CA 91752
951-685-3456
951-685-2788 (fax)
EnviroMech Industries
(Vehicle Conversion)
17011 Beach Blvd
Huntington Beach, CA 92647
714-375-6653
866-836-5386 (fax)
Environmental Vehicle Outfitters, Inc. 11160 Hindry Avenue, Suite H
Los Angeles, CA 90045
310-642-8500
310-642-8700 (fax)
Holden Fleet Services, LLC
(Vehicle Conversion & Retrofit)
135 E. 163rd Street
Gardena, CA 90298
310-707-7537
310-732-1449 (fax)
Omnitek Engineering Corp.
(Vehicle Conversion)
1945 S. Rancho Santa Fe Road
San Marcos, CA. 92609
760-591-0899
760-591-0880 (fax)
South Bay Midas
(CNG vehicle service only)
2000 Lomita Blvd
Lomita, CA 90717
310-326-0600