Oil Spills

Golden Gate Bridge, By Marvin Miller

Oil spills are a particularly frightening and shocking environmental disaster, due in part to the immediately visible consequences to animals and habitat. Many state and federal agencies are involved in preventing and responding to oil spills. For details on the California Coastal Commission's role, visit our Oil Spill Program.

California has been the site of several large oil spills in recent history. In 1969, a blowout of a Union Oil drilling rig platform off the coast of Santa Barbara resulted in a spill of 4.2 million gallons of crude oil into the ocean and onto nearby shores. This disaster is considered to have been a catalyst for the modern environmental movement. In 1971, 800,000 gallons of bunker fuel spilled in San Francisco Bay, with a devestating impact on local species. In Huntington Beach in 1990, the American Trader oil tanker spilled more than 416,000 gallons of crude oil, killing an estimated 3,400 birds. In 2007, a container ship struck the Bay Bridge and spilled 58,000 gallons of bunker fuel into San Francisco Bay. A video is posted modeling the movement of that oil in the Bay. On May 19, 2015 a crude oil pipeline spilled 100,000 gallons into the ocean at Refugio State Beach in Santa Barbara County.


Why is oil harmful to the environment?

Dead bird collected from Rodeo Beach. Photo: The Marine Mammal Center

Oil in the water can be deadly for animals. Oil is toxic when ingested. When birds get oil on their feathers, it impairs the important waterproofing that is necessary to keep a bird warm. A bird may also lose its ability to float in the water or to fly if it is covered in oil. Oiled marine mammals may suffer from hypothermia. Oil may cause reproductive problems and genetic abnormalities in fish. Contaminants may enter the food chain and result in seafood that is unfit for people to eat.

As of November 26, 2007, 2,125 birds were either found dead or died after collection due to the Cosco Busan oil spill in San Francisco Bay. As of that date, 773 birds had been cleaned of oil and 188 of those had been released back into the Bay. Recovery workers after the 1989 Exxon Valdez incident, which spilled 11 million gallons of oil in Alaska, collected about 30,000 dead oiled birds and 1,000 dead sea otters, among other animals. Many other animals were likely affected but not recovered. Dolphin health was still being impacted years after the 2010 Deepwater Horizon explosion that spilled more than 130 million gallons into Gulf of Mexico waters.

More information on the effects of oil on wildlife:


What is the government doing to prevent oil spills?

Rodeo Beach is closed due to oil spill. Photo: The Marine Mammal Center

After the large Exxon Valdez oil spill in Alaska in 1989, both the United States and California governments enacted laws to help prevent oil spills. The International Safety Management Code, enforced since 1998, requires ships entering U.S. ports to meet certain standards, including procedures for reporting accidents and requiring qualified crew. In 1990, the U.S. enacted the Oil Pollution Act (OPA). One of the things OPA did was require that oil tankers be double-hulled, and requires the phase out of existing single-hull tankers. A double-hull further protects a ship from damage to its cargo tank, reducing the risk of oil spilling during an accident. California enacted the Oil Spill Prevention and Response Act in 1990, which established the Office of Oil Spill Prevention and Response within the Department of Fish and Game, which is authorized to direct spill response, cleanup, and natural resource damage assessment activities, as well as regulate all private vessels over 300 gross tons (672,000 pounds) that enter California ports.


What can you do to protect the Bay and the ocean?

Although large oil spills are disastrous for people and wildlife, much of the oil spilled into the ocean comes from runoff from roadways that flows into storm drains and then into waterways. This means that individuals can have a big impact on the health of our coast and ocean. People doing a shoreline cleanup

What can you do?


Classroom activities about oil spills


Oil Spill Glossary

Here are a few words you may run into when learning about oil spills:

Barrel: In the petroleum industry, a barrel of oil is 42 U.S. gallons. (California Energy Commission)

Boom (Containment Boom): A floating mechanical structure that extends above and below the water surface, designed to stop or divert the movement of an oil slick (a smooth area on the surface of water caused by the presence of oil). (Hazardous Materials Dictionary)

Bunker fuel oil: A very heavy substance, left over after other fuels have been distilled from crude oil. It is used in power plants, ships and large heating installation. The oil has a high sulfur content which causes air quality concerns when burned. (California Energy Commission)

Crude oil: A comparatively volatile liquid bitumen composed principally of hydrocarbon, with traces of sulphur, nitrogen or oxygen compounds; can be removed from the earth in a liquid state. (European Environmental Agency)

Oil spill: The accidental release of oil, or other petroleum products usually into freshwater or marine ecosystems, and usually in large quantities. It can be controlled by chemical dispersion, combustion, mechanical containment, and absorption. (European Environmental Agency)

Water column: A hypothetical "cylinder" of water from the surface of a water body to the bottom and within which physical and chemical properties can be measured. (EPA)

Find us on Facebook     Follow TheCACoast on Twitter     Join us on Instagram