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Chicago, IL


Areas of Practice

  • Environmental Law
  • Utility


  • Southern Illinois University School of Law, J.D., 1986
  • Southern Illinois University, B.A. in Political Science, 1982


  • Illinois
  • Iowa
  • U.S. District Court for the Northern District of Illinois

Practice Description

Daniel L. Siegfried concentrates his practice on a broad range of environmental issues arising under new and existing federal and state law, with particular emphasis on permitting, regulatory compliance, and enforcement matters.

Mr. Siegfried has over 25 years of experience representing clients in the electric utility and natural gas industries in all major areas of environmental regulation, including:

  • air and water permitting
  • hazardous waste management
  • due diligence
  • voluntary remediation
  • business transactions

He has focused on permitting for coal-fired power plants, natural gas-fired generation, natural gas pipelines, and compressor stations, as well as the handling and management of coal ash and remediation of manufactured gas plant sites. He combines his experience with a strong defense and strategic negotiations of enforcement actions, including requests for information, notices of violation or noncompliance, site investigations, settlement agreements, and administrative consent orders.

Previously, Mr. Siegfried served as Attorney to the Chairman of the Illinois Pollution Control Board, where he presided over regulatory hearings and advised the Chairman on permit appeals, variance requests, enforcement cases, and similar proceedings in air, water, and waste.

Bar/Professional Associations

  • Chicago Bar Association
  • Environmental Law Committee

Awards, Honors & Distinctions

  • Illinois Leading Lawyer (2018-2019)

Representative/Recent Case Results

  • Negotiated leak detection and repair (LDAR) compliance agreement and settlement order with EPA for an energy client in West Virginia.
  • Negotiated administrative compliance order with EPA for utility client enabling power plant to continue operating beyond the compliance deadline specified in the Mercury and Air Toxics Standards (MATS) rule.
  • Counseled three utility clients in New Source Review enforcement cases.
  • Managed Clean Water Act citizen suit filed by Sierra Club against utility client.