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Professional portrait of Leah Hurtgen Ziemba

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Leah takes a big-picture approach in advising clients as they face challenges on environmental, food safety, and regulatory compliance issues. She draws on experience gained in cases involving the EPA, FDA, and other public agencies.

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Leah’s success as a counselor, litigator and negotiator reflects her combination of subject matter expertise, industry knowledge, and creativity. Her work includes:

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Counseling clients through legal issues associated with PFAS and other contamination plumes that impact drinking water resources and residential homes

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Investigating, assessing, and remediating vapor intrusion issues at sites with historic solvent contamination

Providing environmental liability assessments and risk management during transactional due diligence

Implementing the Food Safety Modernization Act and advising on food labeling matters (e.g., “natural” claims, standards of identity)

Navigating local, county, and state environmental regulations to permit and build or expand manufacturing facilities and commercial dairy operations

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Leah has successfully negotiated State Pollutant Discharge Elimination System-related consent orders for agribusinesses with state regulatory agencies and the EPA. She has substantial experience with Per-and Polyfluoroalkyl substances (PFAS), including performing detailed legal analyses regarding the extent of state and federal regulatory authority related to PFAS compounds, evaluating PFAS-focused supply chain requirements and advising clients on best practices to assess current and historical PFAS risk exposures and related considerations. Leah has also achieved positive outcomes for clients with Concentrated Animal Feeding Operations (CAFOs) on environmental compliance matters.

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Assisted a client that planned to open a large-scale dairy farm with environmental and regulatory permitting processes at the local, county, and state level

Advised a client involved in aluminum die-casting manufacturing on responding to soil, groundwater, and vapor intrusion contamination at an industrial location and off-site properties including counseling the client through a comprehensive environmental site investigation and several response actions. The client settled state and federal class action lawsuits and obtained a favorable historic insurance coverage settlement.

Worked on regulatory issues for a client providing animal health and veterinary health supplies and services. As part of a regulatory review of business structure in multiple states, Leah assisted with regulatory due diligence for an equity acquisition and also provided regulatory compliance training to company employees.

Guided a vegetable processor during acquisition due diligence. Leah advised on environmental and food safety matters to ensure seamless transition and continued production after acquisition

Advised an agribusiness on FDA enforcement regarding drug residue matters. Leah reached settlement with the FDA that addressed compliance matters that allowed the operation to continue operating and drafted going-forward compliance documents

Counseled a former wire manufacturer on soil, groundwater, and vapor intrusion concerns at historic manufacturing facility that was redeveloped for housing purposes. Leah assisted in addressing an immediate need regarding vapor intrusion risks to redeveloped housing property, and also advised on enforcement defense and regulatory compliance matters to bring site to regulatory closure.

Serves as the general counsel for a dairy trade association. Leah advises on corporate governance matters as well as environmental, labor, and employment, immigration and other matters affecting dairy farms in the Northeast U.S.

Counsels clients on compliance with California’s Proposition 65 warning requirements, including applicability issues for manufacturers, producers, suppliers, distributors, and retailers.

Prior to attending law school, Leah built her knowledge of the regulatory area working as a public policy specialist, regulatory coordinator and lobbyist in Albany, New York.

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Legal Bites

Food & Beverage Regulatory Update – April 2025

Food & Beverage Regulatory Update – May 2025

Tami Jackson Buckner and Leah Ziemba Featured in August/September Edition of Food Safety Magazine

Food & Beverage Regulatory Update – June 2025

Food & Beverage Regulatory Update – July 2025

Food & Beverage Regulatory Update – August 2025

Food & Beverage Regulatory Update – September 2025

Wisconsin DNR Halts Efforts to Set PFAS Groundwater Standards, Concedes Legislative Action Will Be Required for Adoption of Proposed Standards

Michael Best Announces Election of Four to Equity Partnership

Leah Hurtgen Ziemba

Credentials

Engagement

Insights

Two New Lawsuits Challenge California and Oregon’s Plastic Recycling and Reduction Laws

Forty-Seven Attorneys Recognized in Chambers USA 2026 Rankings

Legal Bites: Q1 2026 Edition

Credentials

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Industries

Education

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Honors & Recognition

Engagement

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Community

Insights

Two New Lawsuits Challenge California and Oregon’s Plastic Recycling and Reduction Laws

Forty-Seven Attorneys Recognized in Chambers USA 2026 Rankings

Legal Bites: Q1 2026 Edition

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