Santa Susana Field Laboratory

Santa Susana Field Laboratory. Located in the Simi Hills on the border of Ventura County and Los Angeles County, this complex was a premier rocket engine test and nuclear research facility for decades. Established after World War II, its work was pivotal to the Cold War and the Space Race, involving major government agencies and aerospace contractors. The site's legacy is now dominated by significant environmental contamination and a protracted cleanup effort, which remains a source of ongoing controversy and community activism.

History

The facility was established in 1947 by North American Aviation on land formerly used for ranching, strategically situated away from major population centers. Its initial purpose was to support the development of advanced propulsion systems, including those for the Navaho cruise missile. In the 1950s, the Atomic Energy Commission selected a portion of the site, known as the "Energy Technology Engineering Center," for pioneering work on civilian nuclear power, including the SNAP-10A, the first nuclear reactor launched into space by the United States. Throughout the Cold War, it operated as a critical testing ground for engines used in programs like the Redstone and Saturn rockets, directly supporting NASA's Apollo program. Ownership and operational control evolved with the aerospace industry, eventually coming under Rockwell International and later The Boeing Company.

Operations and testing

Primary operations centered on the testing and development of liquid-propellant rocket engines for military and space applications. The site featured numerous test stands, including the iconic "Alfa," "Bravo," "Coca," and "Delta" test areas, where engines for the Saturn V and the Space Shuttle were fired. The nuclear research area, operated for the U.S. Department of Energy, housed at least ten experimental reactors, including the Sodium Reactor Experiment, which experienced a partial core meltdown in 1959. Other activities included the testing of compact reactors for the Systems for Nuclear Auxiliary Power program, experiments with exotic nuclear fuels, and the open-air burning of radioactive and chemical wastes, a common disposal practice at the time.

Environmental contamination and cleanup

Decades of operations resulted in widespread soil and groundwater contamination with radioactive isotopes such as tritium, cesium-137, and strontium-90, as well as hazardous chemicals including PCBs, dioxins, and heavy metals like chromium and perchlorate. Initial cleanup efforts were governed by a 2007 administrative order of consent between the state of California and the responsible parties: Boeing, NASA, and the U.S. Department of Energy. The cleanup has been contentious, with disputes over the thoroughness of soil removal, particularly regarding adherence to a stringent California standard requiring restoration to background levels, a more rigorous benchmark than federal Superfund requirements. Significant volumes of contaminated soil have been removed, but groundwater remediation and final site closure remain incomplete.

Health impact studies and community concerns

Community concerns, led by groups like the Committee to Bridge the Gap and Parents of Santa Susana, have focused on potential health impacts from historical releases. Epidemiological studies, including one by the University of Michigan, have suggested possible correlations between site-related contamination and increased cancer incidence in nearby populations, such as Simi Valley and Canoga Park. The Agency for Toxic Substances and Disease Registry has issued public health advisories for the site. These findings have fueled persistent activism and litigation, with residents advocating for a more aggressive and transparent cleanup process, often citing the 1959 meltdown and other unplanned releases that were not fully disclosed to the public for years.

Site status and future use

The majority of the site is owned by The Boeing Company, with portions still controlled by NASA and the U.S. Department of Energy. All active testing ceased by 2006. Current efforts are focused on the long-term environmental remediation under the oversight of the California Department of Toxic Substances Control and the U.S. Environmental Protection Agency. The future use of the land is uncertain, though there are proposals for its preservation as open space within the Simi Hills, contingent upon the completion of a cleanup deemed protective of human health and the environment. The timeline and final standards for this cleanup continue to be the subject of legal and regulatory negotiation.