Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Emergency

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Climate Change
    • Emergency Response
    • Environmental Information by Location
    • Environmental Justice
    • Greener Living
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History
    • Staff Directory

Breadcrumb

  1. Home
  2. NEPA
  3. NEPA Home
  4. EPA's Role in the NEPA Process
  5. Review Process under Section 309 of Clean Air Act

NEPAssist

NEPAssist is a tool that facilitates the environmental review process and project planning in relation to environmental considerations. The web-based application draws environmental data dynamically from EPA Geographic Information System databases and web services and provides immediate screening of environmental assessment indicators for a user-defined area of interest. These features contribute to a streamlined review process that potentially raises important environmental issues at the earliest stages of project development.​

Resources for NEPAssist Users

  • NEPAssist User Guide - provides assistance on how to use the NEPAssist tool.
  • Description of Map Features - provides information on available data features in NEPAssist.
  • EJSCREEN - an environmental justice mapping and screening tool that provides EPA with a nationally consistent dataset and approach for combining environmental and demographic indicators.

Launch the Tool

  • Launch the NEPAssist Tool

NEPAssist Basic Training Videos

  • How to Use the Basic Features in NEPAssist   
    Exit to YouTube

  • How to Use Basic Map Data Layers in NEPAssist   
    Exit to YouTube

NEPAssist Advanced Training Videos

  • How to Use Advanced Map Data Layers in NEPAssist 
    Exit to YouTube

For questions or assistance on NEPAssist, please email NEPAssist (NEPAssisthelp@epa.gov).

NEPA

  • NEPA Home
    • Learn About NEPA
      • What is the NEPA Review Process?
      • Get a Copy of an EIS
      • How Citizens Can Comment and Participate
    • Filing an EIS
    • EPA's Role in the NEPA Process
      • Review Process under Section 309 of Clean Air Act
      • NEPA Policies and Guidance
    • NEPAssist
Contact Us about the National Environmental Policy Act
Contact Us about the National Environmental Policy Act to ask a question, provide feedback, or report a problem.
Last updated on October 11, 2024
  • Assistance
  • Ayuda
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • Aide
  • Asistans
  • Korean
  • Assistência
  • Russian
  • Tulong
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions

Follow.