Practice Areas


  • Tulane University Law School, J.D., magna cum laude

  • University of New Hampshire, B.A., Political Science, summa cum laude, Phi Beta Kappa

State Bar Admissions

  • California

  • District of Columbia

  • Maryland

Noah Perch-Ahern

t:  310.556.7842
f:  310.843.2642
  • Vcard:
  • Connect:
  • Download Full Bio:

Noah Perch-Ahern, a Partner in Glaser Weil's Environmental & Energy Department, maintains a broad national environmental and energy practice and is often engaged to work on cases of first impression and other sharply disputed matters. Mr. Perch-Ahern has significant litigation experience and has taken cases to trial. At the same time, Mr. Perch-Ahern regularly helps clients devise solutions to difficult regulatory problems and represents clients in connection with administrative proceedings. A significant component of Mr. Perch-Ahern’s practice also involves transactional matters. For example, Mr. Perch-Ahern frequently advises clients concerning the environmental aspects of business transactions, represents energy-focused startup companies, and counsels clients in connection with the environmental land use matters related to development projects, including industrial, commercial, and renewable energy projects.  

Mr. Perch-Ahern has played a key role in variety of high stakes matters, including cost recovery actions involving Superfund sites, constitutional litigation, appellate litigation, environmental remediation projects, portfolio deals concerning electric generation facilities, landfills, and downstream petroleum assets, compliance matters concerning air quality, water quality, hazardous waste, and energy and utility regulation. Mr. Perch-Ahern has counseled clients concerning all of the major federal environmental statutes, including CERCLA, RCRA, the Clean Water Act, the Clean Air Act, and NEPA, and has also advised clients concerning various state environmental statutes and regulations around the country, including regulatory programs related to climate change and cap-and-trade, coastal regulations, Brownfield laws, and water rights. Mr. Perch-Ahern has developed specialized knowledge and experience in several niche areas of environmental law. For example, in addition to extensive experience litigating cost recovery and contribution actions, Mr. Perch-Ahern has litigated several challenges to state waste programs based on the dormant commerce clause of the U.S. Constitution, and has litigated a number of cases centered on preemption principles arising under federal and state law, including laws governing water and electric utilities.

Mr. Perch-Ahern maintains active leadership positions in a number of water, energy and environmental associations.  Mr. Perch-Ahern is the President of the Young Professionals in Energy (YPE) Los Angeles, sits on the Board of Trustees for the Southern California Water Committee (SCWC), is a member of the Board of Directors for TreePeople and the Valley Industry and Commerce Association (VICA), serves as Co-Chair of VICA’s Environmental, Energy and Utilities Committee, and is Co-Chair of the Los Angeles Area Chamber of Commerce’s Water, Energy & Environmental Sustainability Council.

Mr. Perch-Ahern received his law degree, magna cum laude, from Tulane University Law School, where he earned the Environmental Law Certificate and served on the Tulane Environmental Law Journal, both as a managing editor and a contributing writer. Mr. Perch-Ahern received his bachelor’s degree in political science, summa cum laude, from the University of New Hampshire, where he participated in the Honors Program and was a member of Phi Beta Kappa.

Mr. Perch-Ahern is an avid runner and lover of the outdoors. He is a proud husband and father of two spirited daughters and two unruly dogs.

  • Tulane University Law School, J.D., magna cum laude

  • University of New Hampshire, B.A., Political Science, summa cum laude, Phi Beta Kappa

  • California

  • District of Columbia

  • Maryland

  • Litigation

    Represented ranching company in lawsuit involving open-pit mining and Superfund site, including claims relating to water rights, common law tort claims, and CERCLA claims, and involving issues related to acid mine drainage, statutes of limitations, continuing tort, and restoration damages.

  • Represented television manufacturer in constitutional challenge against electronic waste program under dormant Commerce Clause and other constitutional provisions.

  • Represented metals fabricator in citizens suit arising under the Clean Water Act alleging violations of the statewide industrial general permit for stormwater discharge.

  • Represented a major oil company with respect to defense and prosecution of claims and cleanup activities at one of California’s largest hazardous waste sites, including participation in a PRP working group.

  • Represented real estate development company against municipal defendant through trial in cost recovery action arising under CERCLA and the HSAA, including issues related to burden of proof under CERCLA as well as the third party defense.

  • Defended a water utility against a claim involving a regional groundwater contamination dispute based on CPUC preemption and non-liability under CERCLA.

  • Represented electric generating facility in writ against California Coastal Commission under the Warren-Alquist Act.

  • Defended a water utility with respect to a wrongful death drinking water contamination action based on CPUC preemption.

  • Defended a seller in an indemnity action concerning a cleanup at a former aerospace facility.

  • Defended a seller against a claim that inadequate measures were being taken in pursuit of regulatory closure relating to an ongoing remediation.

  • Prosecuted a constitutional challenge under the Dormant Commerce Clause with respect to interstate waste restrictions.

  • Defended multiparty claims against the seller of a portfolio of service stations under the Petroleum Marketing Practices Act, including emergency federal appellate practice.

  • Represented an excess insurance company in a subrogation claim involving defining principles of bad faith insurance law.

  • Defended a partnership against a partner’s claim with respect to obligations and rights relating to an organic farm.

  • Defended a nutritional supplement manufacturer against a claim by an Olympic athlete relating to doping.

  • Business Transactions and Development Projects

    Performed the environmental work, including due diligence and preparation of purchase and sale agreement, for a large portfolio sale of gasoline service stations.

  • Performed the environmental work for acquisition of after-market auto products company, including due diligence, preparation of relevant provisions of stock purchase agreement, and permit transfers.

  • Advised a real estate development company with respect to the acquisition of a former aerospace facility.

  • Advised several startup companies in connection with corporate-related work. 

  • Counseled the developer of a major water storage and solar energy project with respect to CEQA compliance and other environmental land use matters, including endangered species regulations.

  • Provided CEQA counsel for industrial expansion project involving metals fabrication. 

  • Negotiated and prepared lease documents for the conveyance of a deal involving hundreds of service stations.

  • Conducted due diligence and preparation of a stock purchase agreement for a portfolio of energy production facilities.

  • Conducted due diligence for a large-scale sale of landfill assets.

  • Advised a range of clients concerning the purchase and sale of various Brownfield properties, including matters relating to allocation of liability, indemnity and cleanup standards.

  • Advised numerous financial institutions concerning potential environmental liability associated with lending and financing, including advice concerning lenders’ environmental recourse options under loan and mortgage agreements and potential protections for foreclosing lenders under CERCLA’s secured creditor exemption and similar state lender liability protections.

  • Advised clients with respect to NEPA requirements for a variety of proposed developments, including a light rail project and a nuclear energy facility.

  • Advised clients concerning regulatory requirements of industrial transactions, and assisted clients in connection with subsidies and financing for renewable energy and low-greenhouse gas emitting projects.

  • Regulatory and Administrative 

    Managed dozens of environmental cleanups across the county by directing environmental consultants and working with agencies to devise investigations and remediations in accordance with regulatory standards.

  • Counseled client in water master proceeding in connection with water right claim involving surface water rights. 

  • Defended administrative action by DTSC alleging unlawful waste transport. 

  • Provided regulatory counsel to electric generation facility in connection with environmental enforcement action by City and California Coastal Commission. 

  • Counseled the owners of a former oil refinery in an EPA enforcement action involving potential civil and criminal penalties.

  • Assisted client relating to issues involving emissions allowances and offsets generated pursuant to California’s cap-and-trade program.

  • Provided environmental auditing advice to major oil and chemical company. 

  • Provided regulatory counsel concerning numerous compliance issues relating to water rights and water quality matters, including issues relating to wetlands (under state and federal law) and stormwater permitting (including the Industrial General Permit), pollutant and waste discharge requirements (including WDRs and NPDES), and regulatory requirements relating to drinking water standards and protocols.

  • Provided advice concerning various air quality matters, including issues relating to air quality standards for mobile source fuelers, gasoline dispensing facilities, scrap metal facilities, and large generators.

  • Provided counsel concerning release reporting requirements and solid and hazardous waste disposal.

  • Counseled clients concerning endangered species regulations in connection with property maintenance and operation of renewable energy projects.

  • Counseled client with respect to oil and gas regulatory issues, including rights relating to leases.

  • Drafted insurance products relating to green building standards, including LEED.

  • Drafted protocols for developers for handling potential lead and asbestos during construction, renovation, and demolition activities and best management practices to prevent stormwater pollution.

  • Advised clients concerning the political landscape pertaining to greenhouse gas regulation for automobiles, and assisted with lobbying efforts concerning the waste industry.

  • Provide advice concerning California Proposition 65 in connection with electronic consumer products.

  • Young Professionals in Energy Los Angeles (YPE), President

  • Southern California Water Committee (SCWC), Board of Trustees

  • Valley Industry and Commerce Association (VICA), Board of Directors and Co-Chair of Environmental, Energy and Utilities Committee

  • TreePeople, Board of Directors

  • Los Angeles Area Chamber of Commerce, Co-Chair of Water, Energy & Environmental Sustainability Council

  • TreePeople, Board of Directors

  • Los Angeles Area Chamber of Commerce, Co-Chair of Water, Energy & Environmental Sustainability Council

  • American Bar Association’s Natural Resources & Environment Section

  • California State Bar’s Litigation Section

  • California State Bar’s Environmental Law Section