On what date did the Santa Barbara oil spill begin, a disaster linked to Earth Day's creation?

The Santa Barbara oil spill began on January 28, 1969, when Union Oil’s offshore Platform A suffered a well blowout.

The platform stood in the Dos Cuadras Offshore Oil Field, about six miles off the Santa Barbara coast. Workers drilling Well A-21 encountered intense underground pressure; oil and gas escaped through the seafloor even after crews tried to close the well. The release continued for weeks, contaminating beaches, wildlife, and the Santa Barbara Channel.

The date is often confused with April 22, 1970—the date of the first nationwide Earth Day. The spill did not occur on Earth Day, but it helped inspire the environmental movement that made Earth Day possible. Senator Gaylord Nelson cited the enormous oil slick as a powerful influence on his campaign for a national environmental teach-in.

Santa Barbara activists also organized locally, forming groups such as Get Oil Out! and holding Environmental Rights Day on January 28, 1970, the spill’s first anniversary. The disaster helped propel major environmental laws, including the National Environmental Policy Act.