William Warren’s environmental practice encompasses administrative, transactional and litigation representations. He helps clients meet federal and state requirements and, if necessary, negotiate disputes with governmental entities. His practice also includes the defense of major litigations commenced by governmental entities. Clients engage Bill for counsel on federal and state requirements, especially Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) cost-recovery actions, natural resource damage litigation and compliance with New Jersey’s Industrial Site Recovery Act (ISRA). He also supports clients in contractual drafting and negotiation with respect to environmental issues associated with leaseholds and the purchase or sale of real estate, businesses and companies. Given his extensive experience prosecuting and defending virtually every type of environmental litigation, as well as negotiating the environmental aspects of business transactions, Bill is a highly sought-after advocate in cost-recovery efforts, toxic tort litigation and complex multiparty environmental litigation.

Legal Innovation

Bill is well-known for devising creative solutions to protect sellers of property from environmental claims. He also negotiates express consent decree provisions to limit or control liabilities and thereby facilitate business transactions. Some of his inroads include:

  • Developing the concept of the springing easement to protect property sellers from post-closing environmental obligations
  • Appearing as lead or common counsel at Superfund or CERCLA removal sites
  • Securing a waste-specific release from the U.S. Environmental Protection Agency (EPA) as part of a CERCLA consent decree
  • Becoming the first lawyer to convince the New Jersey Department of Environmental Protection (NJDEP) to issue an ISRA letter of nonapplicability for a publicly traded company’s spinoff of one of its operating divisions

In addition, Bill has helped streamline recordkeeping efforts in the environmental law community. He developed one of the top digital environmental libraries in the country, making arcane information more accessible to professionals. Bill also developed a computerized Freedom of Information Act (FOIA) program that allows the firm’s internal resources to access public documents that are usually maintained in obscurity and frequently overlooked.

Past Experience

Bill previously clerked with the Honorable John R. Bartels in the U.S. District Court for the Eastern District of New York.


Bar Admissions

New Jersey
New York


Harvard Law School — Negotiation and Mediation
State of New Jersey Office of Dispute Resolution — Mediation


New York University School of Law
J.D. Annual Survey of American Law (1973)

Colgate University
B.A. (1969)


  • American College of Environmental Lawyers — Fellow
  • Chambers USA —New Jersey, Environment, "Senior Statespeople," 2020
  • Chambers USA —New Jersey, Environment, 2005-19
  • Best Lawyers® — Environmental Law, 2020-21; Litigation – Environmental, 2020-21

Awards Methodology

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