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  1. Professionals

Sam Falcon Trimbach

Partner

Chicago

+1 312-558-7552

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  • Overview
  • Experience
  • Credentials
  • Insights & News

Sam provides sophisticated counsel on a comprehensive range of environmental matters, guiding clients through the complex landscape of federal, state, and local regulations. His practice is centered on assessing environmental risk in corporate transactions, ensuring regulatory compliance, and representing clients in litigation and enforcement.

Sam's experience spans a broad spectrum of environmental laws, from foundational statutes (including the Clean Air Act, Clean Water Act, Endangered Species Act, RCRA, NEPA, and FIFRA) to emerging regulatory frameworks (for example, sustainability and climate reporting, extended producer responsibility, and emerging contaminants such as PFAS and phthalates). He regularly assists clients in their interactions with regulators, from navigating enforcement actions and negotiating permits to managing reporting obligations related to spills, wastewater bypasses, and historical contamination.

Sam provides assistance on a variety of corporate transactions, including representing buyers, sellers, and lenders. He works on transactions in a range of industry sectors, including automotive, aerospace, medical, textiles, packaging, food and beverage, electronics and semiconductors, and energy. For each transaction he works on, he helps identify and characterize environmental risks so they can be properly mitigated through contractual provisions.

Sam is a pragmatic litigator that has represented clients in lawsuits involving complex environmental indemnity provisions and arising under CERCLA and similar state statutes. His focus is on finding the right litigation path to best meet his clients’ interests and objectives in a cost-effective manner.

Sam has experience assisting clients in communications with regulators in a variety of situations, including requesting the issuance of comfort letters, negotiating permit provisions, and advocating in disputes over potential violations. He also has experience helping clients understand and comply with reporting requirements related to spills, wastewater bypasses, and the discovery of historical contamination.

Key Matters

ENVIRONMENTAL LITIGATION

  • Represented a global materials science company in an environmental indemnification dispute regarding alleged contamination and violations of environmental laws and permits at seventeen locations across the globe.
  • Represented an aerospace company with respect to a claim brought under the Clean Water Act regarding discharges from its manufacturing facility in California.
  • Member of a team that defended a client with respect to CERCLA and contract-based claims regarding a formerly owned facility in North Carolina.
  • Representing food and beverage and consumer product clients with respect to claims brought under California Proposition 65.
  • Represented an advanced manufacturing company with respect to a claim brought under the Clean Water Act related to stormwater discharges from its manufacturing facility in California.
  • Member of a team that defended a global mining and metals company with respect to CERCLA and contract-based claims regarding a formerly owned facility in California.

ENERGY PROJECTS 

  • Represents global bank lenders in financing transactions regarding renewable energy projects (solar, wind, and battery energy storage) being constructed throughout the United States, including conducting environmental and permitting diligence and negotiating financing agreements, permitting opinions, and ancillary documents.
  • Represents project developers with respect to the development and construction of energy projects (cogeneration, solar, and battery energy storage) throughout the United States.

SUSTAINABILITY

  • Provides strategic advice to clients with respect to climate and sustainability reporting requirements under federal and state law, including SEC regulations and California’s climate reporting laws.
  • Assists clients with drafting voluntary ESG and sustainability reports and with reviewing related internal control processes.
  • Assists clients with determining obligations under state Extended Producer Responsibility laws related to packaging materials and single use food service items.

COMPLIANCE

  • Assists clients with environmental permitting and compliance activities associated with constructing new manufacturing facilities and expanding operations at existing facilities throughout the United States, including under the Clean Water Act, Clean Air Act, RCRA, and EPCRA.
  • Represented a solar equipment manufacturer with respect to RCRA compliance associated with recalled and end-of-life products.
  • Representing a luxury goods manufacturer in enforcement proceedings with a state environmental regulator related to alleged non-compliance with a facility’s individual wastewater discharge permit under the NPDES/SPDES program.
  • Represented a global automotive manufacturer in enforcement proceedings with a state environmental regulator related to alleged non-compliance with a facility’s Title V air permit.
  • Represented a retailer in enforcement proceedings related to alleged FIFRA violations associated with disinfecting wipes.

ENVIRONMENTAL RELEASES

  • Assisted a global metal manufacturer with responding to the accidental release of over 5,000 gallons of industrial lubricant from a manufacturing facility, a portion of which reached a nearby storm drain and ultimately a nearby waterway.
  • Assisted a food manufacturer related to a train derailment that included the release of approximately 4,000 gallons of diesel fuel.
  • Assisted a materials science company with responding to an unintentional wastewater bypass of approximately 8,000 gallons of partially treated wastewater.
  • Assisted a food manufacturer related to an unintentional wastewater bypass to a nearby stream and a related claim received from a downstream neighbor.
Recent Experience
Winston Advising Dawn Foods in its Sale to Puratos
Winston Represented ETi Gida in Acquisition of TRUBAR
2025 EnCore Convertible Notes Offering
Winston Advised Ellipsis Onshore Holdings in the Acquisition of Oil and Gas Non-Operated Assets in the Permian Basin of Texas and New Mexico
KeHE Distributors' Acquisition of DPI Specialty Foods
ProFrac Holdings Corp. Affiliate's Acquisition of Performance Proppants
ProFrac Holdings II, LLC, Acquires Monarch Silica, LLC
Oterra Acquisition of Food Ingredient Solutions
Seven Oaks Acquisition Corp. Business Combination with Boxed, Inc.
Incodema Holdings' Acquisition of Majestic Metals
View All Related Matters

  • The Best Lawyers: Ones to Watch®in America—Recognized for Environmental Law (2026)
  • Chambers USA, “Associates to Watch,” Environment: Mainly Transactional (2021–2025)
  • “The Lawdragon Green 500: The 500 Leading Environmental Lawyers” (2024-2026)
  • The Legal 500 US, “Key Lawyer,” Environmental Litigation (2024)

  • Member, Environmental Law Institute
  • Member, American Bar Association
  • Member, Chicago Bar Association

Capabilities

Environmental
Environmental Litigation & Enforcement
Transactions
Private Equity
Mergers & Acquisitions
Litigation/Trials
Commercial Litigation & Disputes
Automotive & Mobility

Key Matters

ENVIRONMENTAL LITIGATION

  • Represented a global materials science company in an environmental indemnification dispute regarding alleged contamination and violations of environmental laws and permits at seventeen locations across the globe.
  • Represented an aerospace company with respect to a claim brought under the Clean Water Act regarding discharges from its manufacturing facility in California.
  • Member of a team that defended a client with respect to CERCLA and contract-based claims regarding a formerly owned facility in North Carolina.
  • Representing food and beverage and consumer product clients with respect to claims brought under California Proposition 65.
  • Represented an advanced manufacturing company with respect to a claim brought under the Clean Water Act related to stormwater discharges from its manufacturing facility in California.
  • Member of a team that defended a global mining and metals company with respect to CERCLA and contract-based claims regarding a formerly owned facility in California.

ENERGY PROJECTS 

  • Represents global bank lenders in financing transactions regarding renewable energy projects (solar, wind, and battery energy storage) being constructed throughout the United States, including conducting environmental and permitting diligence and negotiating financing agreements, permitting opinions, and ancillary documents.
  • Represents project developers with respect to the development and construction of energy projects (cogeneration, solar, and battery energy storage) throughout the United States.

SUSTAINABILITY

  • Provides strategic advice to clients with respect to climate and sustainability reporting requirements under federal and state law, including SEC regulations and California’s climate reporting laws.
  • Assists clients with drafting voluntary ESG and sustainability reports and with reviewing related internal control processes.
  • Assists clients with determining obligations under state Extended Producer Responsibility laws related to packaging materials and single use food service items.

COMPLIANCE

  • Assists clients with environmental permitting and compliance activities associated with constructing new manufacturing facilities and expanding operations at existing facilities throughout the United States, including under the Clean Water Act, Clean Air Act, RCRA, and EPCRA.
  • Represented a solar equipment manufacturer with respect to RCRA compliance associated with recalled and end-of-life products.
  • Representing a luxury goods manufacturer in enforcement proceedings with a state environmental regulator related to alleged non-compliance with a facility’s individual wastewater discharge permit under the NPDES/SPDES program.
  • Represented a global automotive manufacturer in enforcement proceedings with a state environmental regulator related to alleged non-compliance with a facility’s Title V air permit.
  • Represented a retailer in enforcement proceedings related to alleged FIFRA violations associated with disinfecting wipes.

ENVIRONMENTAL RELEASES

  • Assisted a global metal manufacturer with responding to the accidental release of over 5,000 gallons of industrial lubricant from a manufacturing facility, a portion of which reached a nearby storm drain and ultimately a nearby waterway.
  • Assisted a food manufacturer related to a train derailment that included the release of approximately 4,000 gallons of diesel fuel.
  • Assisted a materials science company with responding to an unintentional wastewater bypass of approximately 8,000 gallons of partially treated wastewater.
  • Assisted a food manufacturer related to an unintentional wastewater bypass to a nearby stream and a related claim received from a downstream neighbor.
Recent Experience
Winston Advising Dawn Foods in its Sale to Puratos
Winston Represented ETi Gida in Acquisition of TRUBAR
2025 EnCore Convertible Notes Offering
Winston Advised Ellipsis Onshore Holdings in the Acquisition of Oil and Gas Non-Operated Assets in the Permian Basin of Texas and New Mexico
KeHE Distributors' Acquisition of DPI Specialty Foods
ProFrac Holdings Corp. Affiliate's Acquisition of Performance Proppants
ProFrac Holdings II, LLC, Acquires Monarch Silica, LLC
Oterra Acquisition of Food Ingredient Solutions
Seven Oaks Acquisition Corp. Business Combination with Boxed, Inc.
Incodema Holdings' Acquisition of Majestic Metals
View All Related Matters

Credentials

Education

Sam received his J.D., cum laude, from Northwestern University School of Law in 2017, where he was Managing Editor of the Journal of International Law and Business. He received his B.A., with honors, in geophysical sciences and history, philosophy, and social studies of science and medicine, from the University of Chicago in 2011. 

    Admissions
    • Illinois

    Related Insights & News

    • Co-author, “NY Plastic Pollution Verdict May Not Bode Well For Other Suits,” Law360, January 2025

    • "California’s First-in-the-Nation Climate Disclosure Laws Will Move Forward with Limited Delay Under Recent Amendment," Winston’s Environmental Law Update, Oct. 17, 2024
    • "Legal & Regulatory Update: From Greenwashing to New Climate Disclosure Rules," Manufacturers Alliance, Sustainability Council Meeting, Oct. 12, 2023
    • “The Evolving PFAS Legal Landscape,” Webinar, Jun. 28, 2023 
    • "The Evolving PFAS Regulatory Landscape," Food and Beverage Environmental Conference, Apr. 26, 2022
    • "PFAS Regulatory and Litigation Update," Chicago Bar Association, Environmental Law Committee Meeting, Jun. 16, 2020
    • "The Present and Expected Future of PFAS Regulation and Litigation in the United States," Manufacturers Alliance on Productivity and Innovation, Environmental, Health & Safety Council Meeting, May 28, 2020
    • “The Evolving PFAS Regulatory Landscape” Webinar, Jun. 5, 2019 
    • “Giving the Market a Microphone: Solutions to the Ongoing Displacement of U.S. Workers through the H1B Visa Program,” Volume 37, NW Journal of International Law and Business, 275, 2017
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    View All Insights & News

    Capabilities

    Environmental
    Environmental Litigation & Enforcement
    Transactions
    Private Equity
    Mergers & Acquisitions
    Litigation/Trials
    Commercial Litigation & Disputes
    Automotive & Mobility
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