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The National Environmental Policy Act (NEPA) requires federal agencies to consider the environmental impacts from their actions and to prepare detailed assessments of environmental impacts and alternatives to their actions. Perennial has extensive experience working with federal agencies to prepare detailed Environmental Assessments (EA) and Environmental Impact Statements (EIS) in compliance with NEPA for project-specific impacts on environmental resources and the development of alternative analyses. Additionally, our federal permitting services include field surveys and the preparation and submittal of complete federal application packages. Our expertise, in addition to NEPA, EAs, and EISs, includes but is not limited to the following:

  • Federal Energy Regulatory Commission (FERC)
  • Endangered Species Act Section 7 Consultation and Biological Assessments (BA)
  • ESA Section 10 Permitting and Habitat Conservation Plans (HCP)
  • Section 404/401 Clean Water Act Permitting
  • Section 10 Rivers and Harbors Act
  • Section 106 of the Historic Preservation Act
  • Coastal Zone Management Act


In addition to federal permitting, an array of state and local permits is also normally required. Perennial provides detailed full-services environmental application packages and associated plans for state and local regulatory agencies. Some examples of permits we regularly work with are:

  • Water Rights Acquisition (Withdrawal Permits) and Discharges Permits
  • Stormwater and Wastewater Discharge Permits (NPDES)
  • Stormwater Pollution Prevention Plans (SWPPP)
  • State-listed/protected species of concern consultations and surveys
  • State and local land disturbance permits
  • State Environmental Policy Act (SEPA) reporting/permitting
  • State wetland and waterbody permitting
  • State air quality permitting

Perennial understands the value of timely permitting and environmental compliance services. We strive to provide reliable and efficient permitting assistance to ensure that every project meets the established goals and schedules of our clients. We are fully capable of providing all necessary agency coordination and often serve as a liaison between our clients and agencies to identify and minimize environmental impacts while maintaining project scopes and schedules.