Sophia B. Castillo
PartneratKeller and Heckman LLP
San Francisco, CA
Practicing consumer in San Francisco since 2005.
- 21+
- Years practicing
- 1
- Bar admission
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Quick answer
Sophia B. Castillo is a partner based in San Francisco, CA. The practice focuses on Consumer, Environmental, and General. Sophia has over 21 years of legal experience. Currently practicing at Keller and Heckman LLP.
- Based in
- San Francisco, CA
- Experience
- over 21 years
- Known for
- Consumer · Environmental · General
- Handles Consumer, Environmental, and General matters from San Francisco, CA.
- Over 21 years of practice as a licensed attorney.
About Sophia B. Castillo: Sophia B. Castillo is a partner based in San Francisco, CA. The practice focuses on Consumer, Environmental, and General. Sophia has over 21 years of legal experience. Currently practicing at Keller and Heckman LLP.
Areas of practice
Practice focus
Sophia B. Castillo represents clients in San Francisco, California across the following areas of law. Each area links to other verified attorneys with the same focus.
Biography
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; Litigation - Environmental, 2024 - 2026
•Super Lawyers, San Francisco, Environmental; Environmental Litigation, 2024 - 2026
•JD Supra Readers’ Choice Awards, Food & Beverage, Top Author, 2021 - 2023, 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
March 2026 Bounty Hunter Plaintiff Claims
04.29.2026
Publication
February 2026 Bounty Hunter Plaintiff Claims
03.30.2026
Publication
January 2026 Bounty Hunter Plaintiff Claims
02.26.2026
Publication
Keller and Heckman Attorneys Selected for the 2026 Edition of Super Lawyers
Press Release
05.29.2026
Credentials
Education
University of California, Hastings College of the Law
J.D. · 2005
University of California, Los Angeles
B.A. · 2002
Jurisdictions
Bar admissions
California U.S. Cour
2005 · ACTIVE
Affiliations
Professional memberships
Memberships •Food and Drug Law Institute (FDLI), 2025 Austern Writing Awards Committee •Prop
membership
65 Clearinghouse, Advisory Board Member •ProVisors Network Member •National Charity League, Inc
membership
Locations
Office locations
Keller and Heckman LLP
One Embarcadero Center, Suite 2110
San Francisco, CA 94111
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Client reviews
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Schedule your consultationFrequently asked
Common questions
What areas of law does Sophia B. Castillo practice?
Sophia B. Castillo focuses on Consumer, Environmental, General, Litigation, and Personal Injury.
Where is Sophia B. Castillo located?
Sophia B. Castillo primarily serves clients in San Francisco, California, with an office at One Embarcadero Center, Suite 2110.
How experienced is Sophia B. Castillo?
Sophia B. Castillo has 21 years of legal practice, having been licensed since 2005.
Is Sophia B. Castillo a verified attorney?
Sophia B. Castillo's profile is listed but has not yet been claimed by the attorney. Verification status is pending.
How can I schedule a consultation with Sophia B. Castillo?
You can book a consultation through LawyersListed directly from this page. Initial outreach can also be made by phone at 415-948-2826.
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