As the ever-growing Sandy Fire swept across Southern California, the 45-year-old mother could only think of one thing.\u00a0 The Santa Susana Field Laboratory, or SSFL, is known locally as a problem site\u2014with a pockmarked history amid a spotty cleanup. A blaze hitting the former nuclear reactor and rocket testing site, Bumstead is sure, would be a cataclysm.\u00a0<\/p>\n \u201cThis is what it looks like to evacuate when you\u2019re scared,\u201d she said Monday, \u201cbecause if the smoke were to be radioactive or toxic, you don\u2019t want to breathe it.\u201d<\/p>\n Bumstead returned home Tuesday but remains on alert as the Sandy Fire rages on.\u00a0<\/p>\n The fireline was about a quarter-mile from the site on Tuesday morning. Boeing\u2014which has owned SSFL since 1996\u2014said it has evacuated all personnel from the site who are not involved with fire control.<\/p>\n \u201cWe are actively monitoring the Sandy Fire near the Santa Susana site and are in close coordination with local authorities and emergency responders,\u201d a Boeing spokesman told Inside Climate News in an email.\u00a0<\/p>\n \u201cThis is an ongoing situation, and as it evolves, we will continue to monitor fire conditions,\u201d he said, deferring to the state for other questions.<\/p>\n Radiation exposure has short-term as well as long-term impacts, including greater risk of developing cancer<\/a> and possible harms to cardiovascular<\/a> and immune systems<\/a>.<\/p>\n The Sandy Fire, which surpassed 1,300 acres on Tuesday with only 5 percent containment based on early response efforts, burned near Simi Valley.\u00a0<\/p>\n More than 33,000 people in the valley and other communities were placed under<\/a> evacuation orders. At least one home has been destroyed as of Tuesday afternoon. The cause remains under investigation.\u00a0<\/p>\n Fire crews made strides in cutting firelines since Monday morning, when the incident first began as a brush fire. At about 4 p.m. Pacific on Tuesday, prevailing winds shifted direction from the west, fueled by out-of-season Santa Ana winds.\u00a0<\/p>\n The shifting conditions placed the Santa Susana Field Lab in the immediate path of the Sandy Fire\u2014raising alarms from nearby families like Bumstead\u2019s.\u00a0<\/p>\n Fire crews raced to the scene.\u00a0<\/p>\n \u201cThat is an area that we\u2019re trying to keep the fire out of and we\u2019re putting multiple dozer lines in place, as well as our hand crews are working to increase containment and build contingency lines,\u201d Andy VanSciver, a firefighter and spokesman for the Ventura County Fire Department, told Inside Climate News on Tuesday.<\/p>\n VanSciver said first responders were at the former nuclear site \u201cright away.\u201d<\/p>\n The state Department of Toxic Substances Control did not immediately provide comment Tuesday afternoon.\u00a0<\/p>\n The U.S. Department of Energy said in a statement online<\/a> that it \u201cis closely monitoring the Sandy Fire located adjacent to the Santa Susana Field Laboratory.\u201d So far, \u201cthere is no impact to the site,\u201d the agency wrote.<\/a><\/p>\n VanSciver said he was confident the community would be protected as the fire department arrived at the site quickly, but noted that updates will be provided online.<\/a><\/p>\n Not the First Wildfire Threat<\/p>\n Peter Hemken paused Monday night on his walk up the steep Sequoia Avenue in Simi Valley, overlooking a ridge covered in gray smoke.\u00a0<\/p>\n What began as a small cluster of fires from his sight line became a full out strip.<\/p>\n \u201cOh my God, that\u2019s really flaring up,\u201d the 73-year-old remarked, pulling out his phone for a photo.<\/p>\n Every hour or so since Monday morning, Hemken joined others in walking up the hill to see the Sandy Fire\u2019s progress.<\/p>\n \u201cI used to work in engineering up at Rocketdyne,\u201d he said of the nearby facility that developed space shuttles.\u00a0<\/p>\n A Simi Valley resident for over two decades, Hemken was well aware of the Santa Susana Field Lab. Residents of his Simi Valley neighborhood have not had to evacuate because of a wildfire in recent years, but they are always ready to. The lab has something to do with it.<\/p>\n \u201cI would hate to see a fire get up there,\u201d he said, pointing toward the SSFL site. \u201cThere\u2019s still a lot of nasty chemicals up there.\u201d\u00a0<\/p>\n The SSFL cleanup plan<\/a> is still being finalized, having been expanded, and then stalled, several times in the last 20 years. Through interim measures, approximately 6,000 c<\/a>ubic yards of the most contaminated soil was removed in 2024, the year excavation began and the only one with data available. But that cleanup was limited to a single area. The scope of the full remediation is still being decided by the state, federal authorities and Boeing.\u00a0<\/p>\n The Sandy Fire on Tuesday encroached uncomfortably close to the former nuclear site\u2019s north buffer zone, according to residents and a perimeter map<\/a> of the area\u2019s burn zone.<\/p>\n Melissa Bumstead said health concerns surrounding the site are personal to her. Her daughter, Grace, has had two bouts of a rare form of leukemia, which the family believes is linked to the radiation from SSFL.<\/p>\n She began campaigning 12 years ago for a complete remediation of the former nuclear test site soon after her daughter\u2019s cancer diagnosis.\u00a0<\/p>\n This story is funded by readers like you.<\/p>\n Our nonprofit newsroom provides award-winning climate coverage free of charge and advertising. We rely on donations from readers like you to keep going. Please donate now to support our work.<\/p>\n Donate Now<\/a> <\/p>\n \u201cIt was considered an urban legend,\u201d Bumstead said of cancer links to the site. \u201cIt wasn\u2019t until [my daughter] got diagnosed that we started doing research and found out \u2026 there were a bunch of studies by the University of California, Los Angeles, and epidemiological federally funded studies.\u201d\u00a0<\/p>\n As it turned out, \u201cthe research was there. It just wasn\u2019t being communicated,\u201d she said.<\/p>\n One of the reports that pushed Bumstead toward founding her advocacy organization, Parents Against Santa Susana Field Lab, was a 2007 study<\/a> led by Hal Morgenstern for the Agency for Toxic Substances and Disease Registry and the Centers for Disease Control and Prevention.<\/p>\n Morgenstern, an epidemiologist at the University of Michigan, found residents within two miles of SSFL face a 60 percent higher rate of certain cancer diagnoses than those living five miles away.\u00a0<\/p>\n That study\u2014though not enough to label SSFL as the cause of the higher cancer rate\u2014shed light on the strong correlation between proximity to the site and cancers triggered by radiation exposure.\u00a0<\/p>\n That\u2019s why residents worry whenever air quality alerts start to ping on their phones and a wildfire approaches.<\/p>\n It happened in 2018.<\/p>\n The Woolsey Fire<\/a> burned through 80 percent of the SSFL site, though most of the affected area was in the southern buffer zone and in the rocket testing area, not the nuclear testing area.\u00a0<\/p>\n Initially, the state Department of Toxic Substances Control assured the community that there was no risk of radioactive contamination, an assertion that the agency seemingly confirmed in the 2020 Final Report on the Woolsey Fire.<\/a>\u00a0<\/p>\n However, an independent study<\/a> looking at 360 samples from the area surrounding the burn zone found that 3 percent contained radioactive particles that could be traced to the SSFL. The study, conducted by a doctoral student at Worcester Polytechnic Institute and the co-founders of nuclear watchdog group Fairewinds Energy Education, analyzed more than 10 times the samples taken by the state for monitoring.\u00a0<\/p>\n Boeing had no immediate comment when the study was released in 2021, issuing a statement to NBC4 in Los Angeles that said: \u201cCleanup at Santa Susana will continue to follow California law\u2026 The transformation of Boeing\u2019s land at Santa Susana from a field laboratory to open space is well underway.\u201d<\/p>\n In 2023, Boeing released the results of a study by Risk Assessment Corporation (RAC) that it funded. \u201cBased on the soil sampling, we found no evidence of SSFL impact in off-site soils as a result of the Woolsey fire,\u201d the study says. \u201cMoreover, we found no radionuclide impact on the off-site soils we sampled from past operations of the SSFL\u201d<\/p>\n Parents Against the Santa Susana Field Laboratory responded on its website: \u201cBoeing redid the Woolsey Fire study\u2026collecting samples nine months after the fire. We collected our samples within a month. Our study was peer-reviewed by independent scientists. Boeing\u2019s scientists were paid by Boeing and their findings were NOT peer-reviewed.\u201d<\/p>\n Bumstead received training and volunteered to collect samples for the independent study, along with the co-director of Parents Against SSFL<\/a>, Jeni Knack.\u00a0<\/p>\n Bumstead was glad to be able to be a part of that research and hopes their findings of scattered radioactive material up to nine miles away from the lab will add pressure for better monitoring this time.\u00a0<\/p>\n \u201cWe have such a deeply ingrained belief that if it wasn\u2019t safe, the government wouldn\u2019t let us live here,\u201d she said of local residents. After her experience with the Woolsey fire, she said, she knows that is not always the case.<\/p>\n Although the Sandy Fire has not reached the grounds of the SSFL as of now, it has burned \u201cconcerningly\u201d close to the site of the 1959 sodium reactor meltdown, according to one former firefighter with CAL FIRE who asked that his name not be used.\u00a0<\/p>\n He recommended residents seal off living areas and create positive pressure in their homes by turning on fans and using air filters. The radiation is contained in dust and ash particles, he said, so the sooner you wipe everything down and wash them away, the lower your risks of exposure.\u00a0<\/p>\n People in Simi Valley said they are taking such measures but thinking of the long term, too. As wildfires grow fiercer due to man-made climate change, infringing on more homes and more people, Bumstead fears what ferocious winds and massive blazes could do.<\/p>\n \u201cThere\u2019s a twisted joke that we have here that the Santa Susana Field Lab will be cleaned over time, because all of it will blow off into the surrounding communities,\u201d said Bumstead. \u201cThe surrounding communities will be contaminated, but the site itself will be clean.\u201d<\/p>\n \t\t\t\t\tAbout This Story<\/p>\n Perhaps you noticed: This story, like all the news we publish, is free to read. That\u2019s because Inside Climate News is a 501c3 nonprofit organization. We do not charge a subscription fee, lock our news behind a paywall, or clutter our website with ads. We make our news on climate and the environment freely available to you and anyone who wants it.<\/p>\n That\u2019s not all. We also share our news for free with scores of other media organizations around the country. Many of them can\u2019t afford to do environmental journalism of their own. We\u2019ve built bureaus from coast to coast to report local stories, collaborate with local newsrooms and co-publish articles so that this vital work is shared as widely as possible.<\/p>\n Two of us launched ICN in 2007. Six years later we earned a Pulitzer Prize for National Reporting, and now we run the oldest and largest dedicated climate newsroom in the nation. We tell the story in all its complexity. We hold polluters accountable. We expose environmental injustice. We debunk misinformation. We scrutinize solutions and inspire action.<\/p>\n Donations from readers like you fund every aspect of what we do. If you don\u2019t already, will you support our ongoing work, our reporting on the biggest crisis facing our planet, and help us reach even more readers in more places? <\/p>\n Please take a moment to make a tax-deductible donation. Every one of them makes a difference.<\/p>\n Thank you,<\/p>\n \t\t\t\t\t
Bumstead lives less than four miles from the site of possibly<\/a> the worst<\/a> nuclear meltdown in U.S. history besides the Three Mile Island accident.<\/a><\/p>\n![\"Melissa](\"https:\/\/www.newsbeep.com\/us-ca\/wp-content\/uploads\/2026\/05\/ARV01043-1024x682.jpg\"\/)
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Melissa Bumstead voluntarily evacuated with her family from West Hills on Monday. Credit: Steven Rodas\/Inside Climate News<\/p>\n![\"The](\"https:\/\/www.newsbeep.com\/us-ca\/wp-content\/uploads\/2026\/05\/ARV01059.jpg\"\/)
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The Sandy Fire burns behind a neighborhood in Simi Valley on Tuesday. Credit: Steven Rodas\/Inside Climate News<\/p>\n![\"Peter](\"https:\/\/www.newsbeep.com\/us-ca\/wp-content\/uploads\/2026\/05\/ARV00985-1024x683.jpg\"\/)
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Peter Hemken, a 73-year-old retired engineer, took a walk on the evening the fire began to check its progress. Credit: Steven Rodas\/Inside Climate News<\/p>\n![\"\"](\"https:\/\/www.newsbeep.com\/us-ca\/wp-content\/uploads\/2026\/04\/Steven-Rodas-300x300.jpg\"\/)
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