Active in the Environmental Bar

Pete was recently elected to the governing Council of the ABA’s Section of Environment, Energy and Resources, served as Chair of SEER’s 54th Spring Conference, and has served on nine SEER conference planning committees.

Scout’s Honor

Pete is a proud Eagle Scout and remains actively involved in scouting as an assistant scoutmaster for his son and daughter’s troop

An environmental lawyer at heart

Pete’s interest in environmental law stems from a lifelong love of the outdoors. He has camped, backpacked, fished, and built trails throughout the country, and is generally happiest with a pack on his back, a fly rod in his hand, or a tent over his head.

Read about the practice

Peter Keays represents and counsels corporate and municipal clients in a broad range of environmental matters. Clients rely on him for the unique blend of practical guidance, effective advocacy, creative problem solving, and subject matter knowledge that he consistently brings to bear in complex environmental matters.

Pete maintains a robust CERCLA and contaminated-site practice, representing Fortune 500 companies at some of the nation’s largest and most complex Superfund sites. He represents clients in multiparty CERCLA litigation, allocations, settlement negotiations, engages with state and federal regulators on liability and cleanup issues, and helps clients navigate site remediation, cost-recovery efforts, and brownfield transactions. Pete has developed a reputation for working effectively within large PRP groups to secure practical and favorable client outcomes.

Pete has successfully litigated CERCLA cases in federal district and appellate courts and obtained favorable results for his clients in private allocation proceedings. He is experienced as a neutral arbiter, having served as legal advisor to the allocator of a billion-dollar Superfund sediment site, a role in which he issued opinions on a variety of novel and contested CERCLA questions that helped lead to a universal settlement among nearly one hundred parties.

Closely related to his CERCLA practice, Pete regularly assists clients with the purchase, sale, and management of properties with complex environmental histories, including due diligence, contract negotiation, site remediation, risk management, fill and other soil management issues, asbestos mitigation, voluntary remediation under Pennsylvania’s Act 2, and navigating New Jersey’s ISRA process.

He has extensive experience with various aspects of the Clean Water Act and Pennsylvania’s Clean Streams law, including NPDES permitting, compliance, civil enforcement, litigation, TMDLs, and engagement with EPA, the Pennsylvania Department of Environmental Protection, and various other regulatory entities.

In addition to his national CERCLA litigation practice, Pete represents clients in matters before the Pennsylvania Environmental Hearing Board and in environmental litigation in federal and state courts in Pennsylvania and New Jersey. He has developed a niche litigation practice representing clients in cases involving collapse sinkholes and karst geology. Pete was part of a team that obtained a precedent-setting decision protecting the Delaware River Basin from fracking and clarifying when state legislators can (and cannot) sue over actions taken by the Delaware River Basin Commission and similarly situated entities. He also has experience litigating issues related to Pennsylvania’s Environmental Rights Amendment (Article I, Section 27).

Regulatory compliance and civil enforcement are another component of his practice. He counsels and represents clients in matters involving CERCLA, TSCA, RCRA, FIFRA, related regulations, and other federal, Pennsylvania, and New Jersey environmental laws and regulations. He regularly assists clients in the rapidly-evolving field of PFAS, including helping a large municipality navigate issues related to PFAS regulations, permitting, and liability as its outside environmental counsel.

Pete is heavily involved with the ABA Section of Environment, Energy and Resources (SEER), and was recently elected to its governing Council. He previously served as Chair of SEER’s 54th Spring Conference, as Chair of SEER’s In-House Counsel Committee, and as a member of the planning committee for nine SEER conferences.

Within the firm Pete is the Chair of the Hiring Committee, former Chair of the Diversity, Equity & Inclusion Committee, and a member of the Associate Development Committee. Beyond that, he regularly plans firm social events and seeks out opportunities to bring his colleagues together and mentor junior attorneys.

Recognitions

Ranked in Chambers USA Pennsylvania: Environment as Up-and-Coming, 2025 – 2026

2023 “Lawyer on the Fast Track,” The Legal Intelligencer

Listed among The Best Lawyers in America‘s “Ones to Watch” for Energy Law, 2024 – 2026; Environmental Law and Litigation – Environmental, 2025 – 2026; and Commerical Litigation, 2026

Listed in Pennsylvania Super Lawyers “Rising Stars” for Environmental Litigation, 2021-2023

Jeff & Genie Shields Prize, Vermont Law School, 2022

AWARD METHODOLOGIES

Memberships and Community

ABA Section of Environment, Energy, and Resources

Council member, 2025 – present
Chair, 54th Spring Conference on Environmental Law
Conference Planning Committee Member (Spring Conferences 2022-2027, Fall Conferences 2023,            2026, 2027)
Chair, In-House Counsel Committee, 2023 – 2025

Delaware Valley Environmental American Inn of Court

Secretary and Executive Board Member, 2026 – present
Counselor and Executive Committee Member, 2021 – 2025

 

Teaching and Presentations

Around the World of the EHB in 80 (or 90) Minutes,” Pennsylvania Bar Institute’s Environmental Law Forum, April 9, 2025

Introduction to PFAS – Practical Considerations for Non-Environmental Lawyers,” Pennsylvania Bar Institute Virtual CLE, December 9, 2024

“PFAS Developments: PFOA and PFOS Hazardous Substance Designation, Litigation, Transactions, and Environmental Insurance,” Philadelphia Bar Association CLE, September 16, 2024

“PFAS Regulation: What Does it All Mean?” Philadelphia Bar Association CLE, November 16, 2022

“The Forever Changing Regulatory Landscape of Forever Chemicals: A Primer for Environmental and Non-Environmental Lawyers on PFAS Regulation in Pennsylvania, New Jersey, and at the Federal Level,” Hangley Aronchick CLE, January 20, 2022

“Industry Perspectives on Biden’s Environmental Agenda,” Panel discussion presented by Hangley Aronchick Segal Pudlin & Schiller and Roux, February 2021

 

“Becoming (and Remaining) a Bona Fide Prospective Purchaser: Lessons and Best Practices from the First Two Decades of the BFPP Defense,” Pennsylvania Brownfields Conference, State College, Pennsylvania, March 2020

 

 

 

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Publications and Media

Takeaways from the Ninth Circuit’s Recent CERCLA Contribution Ruling,” Bloomberg Law Environmental and Energy Report, August 21, 2020

“Second Circuit Narrows CERCLA Cost Recovery Single-Remediation Principle,” ABA Section of Environment, Energy and Resources’ Superfund and Natural Resource Damages Litigation Newsletter, August 18, 2020

The Changing Landscape of Water Regulation in the U.S.,” The Legal Intelligencer, July 28, 2020

SCOTUS Superfund Ruling Will Have Ripple Effect,” Bloomberg Law, April 23, 2020

“Compliance with Environmental Obligations During the COVID-19 Pandemic,” Hangley Aronchick Ampersand Alert, April 7, 2020

“Pennsylvania Environmental Quality Board Extends Comment Period for Proposed PFAS Rulemaking,” Hangley Aronchick Ampersand Alert, March 30, 2020

SCOTUS to Decide How “Super” Superfund Really Is,The Legal Intelligencer, July 24, 2019

When Sinkholes Become Legal Problems,” prepared for the 15th National Sinkhole Conference, April 4, 2018

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