Ladera Ranch Ewing Sarcoma Cluster
What has been reported, who is investigating, and what affected families need to know.
Strongin, LLP is a personal injury law firm headquartered in Ladera Ranch, with an established record of successfully litigating toxic exposure cases — including cases that turned on proving exactly what caused the injury. We are currently handling well over 100 toxic exposure matters, most of them in active litigation. We are currently consulting with researchers and physicians who study how cancers arise and how environmental exposures affect human health, including specialists in environmental medicine and toxicology. We are available to speak confidentially with affected families about representation.
Current Status
Investigations underway
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The California Department of Public Health, through the California Cancer Registry and the Cancer Registry of Greater California, is conducting a formal cancer concern assessment focused specifically on Ladera Ranch. It uses case data through 2023 and census-tract-level data that was not available for the 2024 county-level review. Completion is estimated for fall 2026. (CDPH)
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The California Department of Pesticide Regulation and the Orange County Agricultural Commissioner are reviewing local pesticide operations for compliance with state and federal law — interviewing pesticide companies, reviewing use and training records, and observing applications in the field. (CDPH)
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A federal prosecutor asked the U.S. Environmental Protection Agency in July 2026 to investigate whether environmental causes exist and whether federal environmental laws are implicated. (NBC Los Angeles)
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Cal State Fullerton researchers began soil and water sampling in Ladera Ranch on September 14, 2026, testing for heavy metals and pesticides. Results are expected by the end of the year. (Fox News)
Other developments
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A 2024 county-level review was inconclusive because the data available at the time was limited. That is why a focused, Ladera Ranch-specific assessment is now underway. (CDPH)
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The Ladera Ranch Maintenance Corporation (LARMAC), the master homeowners association that manages the community's common areas and its landscaping program, has paused routine herbicide use and formed an advisory committee on landscape chemicals. (Voice of OC)
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Orange County has paused herbicide spraying in San Juan and Trabuco Creeks, and OC Public Works now uses steam rather than herbicides for weed control on Ladera Ranch residential streets. (Office of Supervisor Foley)
What Has Been Reported
Ladera Ranch is an unincorporated community of approximately 26,000 residents in south Orange County. It has no city government. Common areas, landscaping, and the chemical application programs that go with them are administered by the Ladera Ranch Maintenance Corporation — LARMAC, the master homeowners association that governs the community. (Wikipedia; NewsNation)
Ewing sarcoma. CDPH's public FAQ acknowledges six Ewing sarcoma cases reported by the community over the last 13 years. Orange County Supervisor Katrina Foley's July 17, 2026 statement described six children diagnosed in a community of about 26,000. (CDPH; Office of Supervisor Foley)
Deaths. At least two young people from the community have died. (Voice of OC)
Other cancers. Residents have also reported other cancers in the community, including non-Hodgkin's lymphoma in school-age children and a range of adult cancers. These reports are resident-collected and have not been verified by any agency. (The Epoch Times)
What is Ewing Sarcoma?
Families in Ladera Ranch have reported at least six children diagnosed with Ewing sarcoma over the past 13 years, in a community of roughly 26,000 people. Nationally, the disease is diagnosed in approximately 200 to 250 people each year. At least two young people from the community have died. Residents have raised two possible environmental explanations: the pesticides and herbicides applied across the community's common areas, and oil wells drilled and abandoned beneath the land before Ladera Ranch was built in 1999. State and federal agencies are examining both. (CDPH; NBC Los Angeles)
Nearly all Ewing sarcomas involve a change in the EWSR1 gene on chromosome 22. According to the American Cancer Society, these gene changes are not inherited — they develop in a single cell after a child is born, and why they develop is not known. (American Cancer Society) CDPH describes this as a gap in scientific understanding of the disease that will require sustained research to close. (CDPH)
Symptoms to take seriously. Families have described symptoms that began as sudden, severe pain at night, or as an injury that did not heal the way an ordinary sports injury should. (NewsNation) Persistent bone pain, night pain, swelling near a bone, or an injury that is not resolving warrants a conversation with a pediatrician, including about imaging.
Abandoned Oil Wells
Ladera Ranch was built beginning in 1999 on land with a prior industrial history. Residents have asked whether oil wells drilled and abandoned before development were properly plugged, and whether anything is migrating from them.
In September 2026, reporting described a handwritten memo roughly 20 years old indicating that officials were warned not to build on a historical oil well beneath what is now part of Ladera Ranch without "further considerations." (NewsNation) The same reporting notes that no evidence has linked the well to the cancer cases, and CalEPA has not identified an immediate environmental hazard in the community. (NewsNation; CDPH)
The Cal State Fullerton sampling that began on September 14, 2026 is the first environmental testing in the community. Researchers have described it as the first step of a larger investigation, with results expected by year end. (Fox News)
Checking your own property. CalGEM, the state's Geologic Energy Management Division, maintains a public Well Finder tool that lets you search oil and gas wells by address and review the well records and permits on file. CalGEM notes that its data is provided for informational purposes and is not warranted as complete, so a clean search result is not conclusive.
A note on sources. Much of what circulates online about oil wells beneath Ladera Ranch originates from self-published blogs and social media rather than agency records or established reporting. This page is limited to material traceable to a named publication or an agency document.
Who is investigating
Several agencies are involved, and they are answering different questions.
California Department of Public Health and the California Cancer Registry. CDPH, working with the Cancer Registry of Greater California, is conducting a formal cancer concern assessment for the Ladera Ranch area, using case data through 2023 and census-tract-level data that was not available for the 2024 county-level review. The assessment will determine whether the number of cancers diagnosed in the area is higher than would be expected based on population-based registry data. Completion is estimated for fall 2026. CDPH notes that a registry-based assessment can establish whether incidence is higher than expected, but is a separate exercise from determining what caused it. (CDPH)
Department of Pesticide Regulation and the Orange County Agricultural Commissioner. Reviewing pest management operations in Ladera Ranch for compliance with state and federal law, including interviewing pesticide companies, reviewing use and training records, and observing applications. (CDPH)
U.S. Environmental Protection Agency. First Assistant U.S. Attorney Bill Essayli wrote to the EPA Administrator in July 2026 requesting an investigation into whether environmental causes exist and whether federal environmental laws are implicated. (NBC Los Angeles)
Cal State Fullerton. Soil and water sampling for heavy metals and pesticides, begun September 14, 2026, with results expected by year end. (Fox News)
Elected officials. Supervisor Katrina Foley has called on CDPH to expedite its review and publicly release its findings. (Office of Supervisor Foley) Assemblymember Kate Sanchez has requested a joint state investigation. (Assembly District 72)
What Affected Families Should Do Now
1. Start with a physician. Persistent bone pain, night pain, swelling near a bone, or an injury that will not heal warrants a pediatrician's evaluation, including imaging.
2. Demand your association's records in writing. Under the Davis-Stirling Common Interest Development Act (Civ. Code, § 4000 et seq.), members have statutory rights to inspect association records, and the association must respond within statutory timeframes. (Civ. Code, § 5200 et seq.) Request landscape maintenance contracts and all exhibits, pesticide and herbicide application records, product labels and safety data sheets, notice postings, vendor invoices, and board minutes and committee materials addressing chemical use. Keep a copy of the demand and the date sent.
3. Preserve your own records. Photographs and video of spraying, posted notices, and equipment. Dated texts and emails to the association, management company, or landscape contractor. Calendars establishing where a child was and when. HOA newsletters and notices. Much of this is deleted automatically by phones and cloud accounts.
4. Preserve medical records and pathology. Request complete records from every treating provider, including pathology reports and the molecular testing that identified the tumor's gene fusion. Ask the treating institution, in writing, whether tissue specimens are being retained and for how long. Tissue is often the single most important piece of physical evidence, and retention policies are finite.
5. Submit public records requests. Pesticide use records are held by the Orange County Agricultural Commissioner and the Department of Pesticide Regulation. School site application records are held by the district. These are obtainable under the California Public Records Act (Gov. Code, § 7920.000 et seq.).
6. Check what is beneath your property. Search your address in CalGEM's public Well Finder.
7. Find out what deadlines apply to you. They are shorter than most people expect, and they are not the same for everyone.
If you would like help with any of this, we will do it with you. There is no charge for the consultation and no obligation.
Deadlines That May Already Be Running
Toxic exposure claims. Code of Civil Procedure section 340.8 provides a two-year limitations period for civil actions for injury or illness based on exposure to a hazardous material or toxic substance. The period runs from the later of the date of injury, or the date the plaintiff became aware of, or reasonably should have become aware of, the injury, its physical cause, and sufficient facts to put a reasonable person on inquiry notice that the injury was caused or contributed to by the wrongful act of another. A parallel provision applies to wrongful death claims. (Code Civ. Proc., § 340.8, subds. (a), (b).)
News coverage alone does not start the clock. Section 340.8 expressly provides that media reports regarding hazardous material or toxic substance contamination do not, in and of themselves, constitute sufficient facts to put a reasonable person on inquiry notice that an injury or death was caused or contributed to by the wrongful act of another. (Code Civ. Proc., § 340.8, subd. (c).)
Minors. California generally tolls the limitations period during a plaintiff's minority. (Code Civ. Proc., § 352, subd. (a).) That tolling does not apply in the same way to claims against public entities.
Public entities are different, and much shorter. If a claim would be asserted against a public entity — a county department, a school district, or another public agency — the Government Claims Act generally requires a written claim to be presented within six months of accrual for personal injury and wrongful death claims, and presentation is a prerequisite to filing suit. (Gov. Code, §§ 911.2, 945.4.) Late claim relief is limited. (Gov. Code, §§ 911.4, 911.6.)
Limitations analysis in exposure cases is fact-specific and frequently disputed. If you think it might apply to your family, have it run against your actual facts rather than assuming.
How We Handle These Cases
Strongin, LLP is headquartered at 999 Corporate Drive in Ladera Ranch. Our office is here, our children attend school in Ladera Ranch, and members of our team live in the neighboring communities. Toxic and environmental exposure is a core part of our practice — we are currently handling well over 100 toxic exposure matters, most of them in active litigation.
We are currently consulting with researchers and physicians who study how cancers arise and how environmental exposures affect human health, including specialists in environmental medicine and toxicology, on the evidence these claims require. That work involves three things:
Establishing exposure as a matter of record. Where a person was, when, and what was applied there — reconstructed from application records, contracts, invoices, notice postings, witness accounts, photographs, and public records. This is document work, and it starts immediately.
Identifying every responsible party. Depending on the facts, that can include the landscape contractor and applicator, the master association and its management company, the developer and any predecessor landowner or operator with respect to prior site conditions, a product manufacturer or distributor, and a public entity. California law recognizes that a common interest development association and its directors can owe a duty of care to residents. (Frances T. v. Village Green Owners Assn. (1986) 42 Cal.3d 490.)
Proving causation with qualified experts. California requires proof both that a substance is capable of causing the disease and that the exposure was a substantial factor in causing this person's disease. (Rutherford v. Owens-Illinois, Inc. (1997) 16 Cal.4th 953.) That is expert work, and it is why we are engaging those experts now rather than later.
We are available to speak confidentially with any Ladera Ranch family affected by Ewing sarcoma or another cancer of concern. There is no charge for the consultation, and speaking with us carries no obligation.
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Ladera Ranch Cancer Cluster FAQs
Disclaimer: The information provided in this FAQ section is for general informational purposes only and does not constitute formal legal advice. Reviewing these answers does not establish an attorney-client relationship with Strongin, LLP. California laws are complex and change frequently; timelines and outcomes depend entirely on the unique facts of your case. Do not act or rely upon this information without consulting a licensed personal injury attorney directly.
