Casmalia (Chumash: Kasma’li, meaning "it is the last")[3][4] is a census-designated place (CDP) in Santa Barbara County, California located just outside the borders of Vandenberg Air Force Base about 5 miles (8.0 km) southwest of Santa Maria.

[6] 1.2 miles (1.9 km) north of the town, this 252-acre (1.02 km2) hazardous waste landfill began operating in 1973 and accepted toxic chemicals like PCBs, motor oil, and pesticides.

During its operation, 5.6 billion pounds of hazardous waste from up to 10,000 individuals, businesses and government agencies were buried at the site.

[8] The public area of the hotel built by Antonio Tognazzini and operated by Frank A. Vandoit more than 100 years ago still exists, although the guest rooms were torn down in 1944.

[9] According to the United States Census Bureau, the CDP covers an area of 0.2 square miles (0.5 km2), all of it land.

This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F.

There were 61 housing units at an average density of 323.7 per square mile (125.0/km2), of which 29 (50.9%) were owner-occupied, and 28 (49.1%) were occupied by renters.