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Keller and Heckman LLPPartner
Sophia B. Castillo
Pro

Sophia B. Castillo

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One Embarcadero Center, Suite 2110, San Francisco, CA 94111

California's Proposition 65, Environmental and Toxic Tort Litigation, Food and Drug and 7 more

About Sophia B. Castillo

Sophia (Sophie) Castillo counsels domestic and international importers, distributors, national brands, private labels, institutional suppliers, family-owned food processing businesses, and retail grocers on compliance, litigation, and risk avoidance surrounding California’s Proposition 65, as well as other state and national laws related to chemicals and toxics. She advises clients involved in numerous industries across the entire supply chain, including food and beverage, cosmetics and personal care, dietary supplements, apparel, cookware, consumer products, and retail.

Sophie has an in-depth understanding of how exposure analysis provides the basis for California’s Proposition 65 and continues to stay abreast of the evolving regulation. She helps clients create compliant warning and labeling statements, conducts audits, and, if the need arises, will litigate and defend clients in Proposition 65 cases, including assisting with bounty-hunter claims.

In addition to Proposition 65, Sophie counsels clients on other state laws, including California’s regulations related to PFAS and other emerging contaminants in products such as food packaging, cookware, and cosmetics. She also has experience working with chemical disclosure laws in the cosmetics and personal care products space. In her litigation practice, Sophie defends scientific and environmental law and toxic tort cases in litigation and regulatory proceedings and litigates complex multi-party Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and contaminated property cases. Sophie also defends toxic tort matters involving chemicals in foods, beverages, consumer products, and pharmaceuticals.

Due to her vast knowledge of the legal landscape within these industries, Sophie is often invited to speak at industry conferences and author thought-leadership articles.

Prior to joining Keller and Heckman, Sophie was a litigation and Proposition 65 partner at a California-based law firm.

Awards

•The Best Lawyers in America: Environmental Law, 2024 - 2026
•The Best Lawyers in America: Litigation - Environmental, 2024 - 2026
•JD Supra Readers’ Choice Awards, Food & Beverage, Top Author, 2021 - 2023, 2025
•Super Lawyers, San Francisco, Environmental Litigation, 2024 - 2025
•Attorney Intel, Top 50 Attorney of San Francisco, 2023
•U.C. Hastings Pro Bono Attorney Honor Roll, U.C. Hastings Center for Gender and Refugee Studies, 2012
•Hastings Law Journal, Articles Editor, 2004 - 2005
•U.C. Hastings Moot Court Team, Roger Traynor Appellate Moot Court Competition, Second Place - Best Oral Argument, 2004

Insights & In the News

September 2025 Bounty Hunter Plaintiff Claims

10.21.2025
Publication

August 2025 Bounty Hunter Plaintiff Claims

09.24.2025
Publication

July 2025 Bounty Hunter Plaintiff Claims

08.25.2025
Publication

Best Law Firms Features Keller and Heckman in 2026 Edition

Press Release
11.06.2025

 

Sophia B. Castillo (San Francisco, California) View website

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Services

Areas of Law

  • Litigation
  • Other 9
    • California's Proposition 65
    • Environmental and Toxic Tort Litigation
    • Food and Drug
    • Food Litigation
    • Product Safety
    • Sustainability and Product Stewardship
    • Chemicals and Plastics
    • Consumer Products and Retail
    • Food & Life Sciences

Practice Details

  • Firm Information
    Position
    Partner
    Firm Name
    Keller and Heckman LLP
  • Representative Cases & Transactions
    Cases
    Representative Matters: Advised companies throughout the supply chain (European
    U.S. manufacturers, importers, distributors, national br
    s, private label br
    s, family-owned food processing businesses,
    retail stores) on warning m
    ates of California's Proposition 65 for chemicals in products, with focus on food
    beverage, apparel, cooking appliance,
    grocery industries
    Defended, litigated,
    settled Proposition 65 plaintiff claims
    advised clients on associated indemnity obligations throughout the supply chain, including various industry-wide Proposition 65 matters
    Provided compliance advice to U.S.
    European companies regarding California chemical
    recycling regulations, including PFAS/AB 1200, California's toxics in packaging regulations,
    grocery recycling regulations
    Represented client in multi-year natural resource damages (NRDA) regulatory process
    Litigated contaminated groundwater/soil cases pursuant to CERCLA
    state law
    Litigated toxic tort matter related to alleged cancer-causing chemicals in pharmaceutical product
    Frequent presenter on Proposition 65
    related issues for trade groups, including the Specialty Foods Association, the Association of Food Industries,
    the California Grocers Association
  • Additional Links
    https://www.khlaw.com/people/sophia-b-castillo

Experience

  • Bar Admission & Memberships
    Admissions
    2005, California
    U.S. Court of Federal Claims
    U.S. Court of Appeals for the Ninth Circuit
    U.S. District Court, Central District of California
    U.S. District Court, Northern District of California
    U.S. District Court, Eastern District of California
    U.S. District Court, Southern District of California
    Memberships

    Memberships

    •Food and Drug Law Institute (FDLI), 2025 Austern Writing Awards Committee
    •Prop. 65 Clearinghouse, Advisory Board Member
    •ProVisors Network Member
    •National Charity League, Inc.

  • Education & Certifications
    Law School
    University of California, Hastings College of the Law
    Class of 2005
    J.D.
    Other Education
    University of California, Los Angeles
    Class of 2002
    B.A.
    cum laude
  • Personal Details & History
    Age
    Born in 1980
    Tallahassee, Florida, February 11, 1980

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Attorneys FAQs

  • What year was this attorney first admitted to the bar?
    Sophia B. Castillo was admitted in 2005 to the State of California.
  • Is this attorney admitted to practice in any U.S. Federal Courts?
    Sophia B. Castillo is admitted to practice before the United States Court of Appeals for the Ninth Circuit, United States Court of Federal Claims, United States District Court for the Central District of California, United States District Court for the Eastern District of California, United States District Court for the Northern District of California and United States District Court for the Southern District of California.
  • How many attorneys are in this law firm?
    Keller and Heckman LLP has 80 attorneys at this location.
  • What law school did this attorney attend?
    Sophia B. Castillo attended University of California, Hastings College of the Law.
  • What year was this attorney's law firm established?
    Keller and Heckman LLP was established in 1962.

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