William Tarantino

Practice Areas

Drawing on his considerable experience in environmental health, William (Bill) focuses his practice on environmental and consumer protection law, with an emphasis on climate-related goals and claims, hazardous substances, mass torts, and consumer product safety. Bill started his career at the U.S. Environmental Protection Agency, Office of Regional Counsel in San Francisco, and he currently leads the firm’s environmental practice.

Bill routinely advises clients in connection with their carbon reduction and climate-related goals and claims (including carbon neutral and net zero carbon commitments) and helps clients substantiate their claims and avoid greenwashing claims. He frequently advises clients in connection with the Federal Trade Commission’s Green Guides, state consumer protection statutes, and a broad range of sustainability and chemical disclosure laws. He defends clients in environmental and consumer class action litigation in courts throughout the country and is highly regarded for his ability to coordinate technical, legal, and communications teams to counsel clients through crises. He has tried cases in state and federal courts for a variety of complex and multidistrict litigation matters, including product liability claims and environmental and land use disputes.

Bill represents the firm’s clients in nearly every aspect of environmental regulation and supports the firm’s global transactional practices in all areas of U.S. environmental law. He is also a member of the firm’s ESG + Sustainability Steering Committee.

Environmental Litigation and Regulatory

Bill has represented the firm’s clients before a broad range of environmental regulatory agencies in rulemaking proceedings, permit applications, and appeals and enforcement actions. Bill heads MoFo’s environmental due diligence teams and serves as the lead on transactional negotiations involving environmental liability risks, including significant experience in cross-border transactions.

Consumer Class Action, False Advertising, and Product Liability

Bill has broad experience in consumer class action and false advertising litigation, especially concerning claims of health or environmental benefits. He has also advised numerous well known life sciences, technology, and consumer product companies on consumer disclosures and warnings, including compliance with U.S. and European requirements governing product safety.