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RMP - Marathon Refinery

Martinez, CA


Formerly known as the Tesoro Refinery, Ultramar Golden Eagle Refinery, Tosco Avon Refinery, and Phillips Avon Refinery. The refinery is an independent oil refiner and marketer of petroleum products in the United States. The refinery was purchased by Marathon in 2018.

The refinery processes approximately 160,000 barrels (1 barrel = 42 gallons) of crude oil per day into transportation fuels. The principal fuels produced are gasoline and diesel. The refinery produces Propane and Butane for commercial purposes. In addition, the refinery produces anhydrous Ammonia and elemental Sulfur for the agricultural market, as well as petroleum coke used for fuel cogeneration plants in East Contra Costa County and overseas. The refinery also supplies Carbon Dioxide to neighboring Matheson for the manufacture of dry ice.

CalARP Program 4 regulation requires posting of major incidents. Major incidents are defined as an event within or affecting a process that causes a fire, explosion or release of a highly hazardous material, and has the potential to result in death or serious physical harm, or results in an officially declared public shelter-in-place, or evacuation order. This facility has the following major incidents to report:


For additional information regarding this facility's operations and regulated materials handled, please view the Fact Sheet - English | Spanish and Audit Summaries - English | Spanish

Regulated Substances Subject to CalARP/Federal RMP/ISO:

Regulated Substances Program Level CalARP Regulated Federal RMP Regulated ISO Regulated
Anhydrous Ammonia 4 yes no yes
Aqueous Ammonia 4 yes no yes
Sulfur Dioxide 4 yes no yes
Flammables 4 yes yes yes
Hydrogen 3 yes yes yes
Hydrogen Sulfide 4 yes yes yes
Sulfuric Acid 4 yes yes yes