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NEPA Categorical Exclusions Process


Projects that are not likely to cause significant adverse environmental impacts are classified as NEPA Categorical Exclusions (CE). CEs typically do not involve impacts to growth or land use; relocation of significant numbers of people; or significant air, noise, or water quality impacts.  They do not impact cultural, recreational, historic, or other resources, and are not controversial for environmental reasons. 

The information on this page is designed for a technical audience.  

What's New?
2017 Nationwide Permit 23 (NWP 23) removed Pre-Construction Notice (PCN) requirement on most listed CEs. The Special Regional Condition was changed to allow WSDOT signed CEs to qualify under NWP 23; FHWA signature is no longer required.

What types of projects are considered to be CEs? 
(c) and (d) lists are in  23 CFR 771.117 (effective 11/5/2014).

  • 2015 CE Programmatic Agreement (pdf 89 kb) with FHWA allows WSDOT to approve all CE NEPA documentation for FHWA funded projects.
  • Use (c) list before the (d) list
  • Project types (c)(26), (c)(27) and (c)(28) are subject to the constraints in 23 CFR 771.117(e). 

    Use the 
    CE Verification Checklist (docx 23 kb) to determine if your project meets those constraints and attach a copy of the checklist to the ECS form. 

    Consider these 
    definitions (pdf 130 kb) in relationship to the constraints listed in 23 CFR 771.117(e).
  • If project doesn't meet constraints:

    Temporary Occupancy Use and De minimis use
     guidance for obtaining FHWA approval for CE level projects is available on the Section 4(f) web page. 

FTA CEs (c) and (d) lists are in 23 CFR 771.118 (effective 11/5/2014).

  • NEPA documentation for project types on the 'c' list can be signed by WSDOT. Project types on the 'd' list require review and approval by FTA.

Environmental Review Summary (ERS):

Project Scoping:  The NEPA Classification is determined during the project scoping phase. The project is scoped in the ERS tab of the Project Summary database. The ERS establishes the environmental baseline for the project and is used to build the project schedule and budget prior to project funding.

Guidance on how to fill out an ERS is found embedded within the database. For access to the database contact your Region Environmental Coordinator (REC).

Environmental Classification Summary (ECS):

Analyzing and Documenting Impacts -- After a project receives design funding, the project record is exported from Project Summary (ERS) into the Environmental Classification Summary (ECS).

  1. As design issues are resolved, pertinent information is entered into the appropriate blanks in the Environmental Consideration section of the ECS database. 
  2. Environmental documentation for CE level projects is accomplished in the ERS/ECS database. The signed ECS Report and supporting documentation, if any, serves as the environmental document for CE level projects.
  3. According to the 2015 Programmatic Agreement with FHWA:
    • These CEs are typically signed by the Region Environmental Manager.  
    • FHWA audits our CEs annually.  
    • WSDOT’s Office of Equal Opportunity staff also reviews the audited projects for environmental justice. 
  4. The Help index provides guidance for how to answer the questions in the database. Contact your REC for access to the ECS database.
  5. Small projects that take place entirely within the existing ROW may use the new short 'c' List Form. (pdf 117 kb)
  6. Consult with the Coast Guard if a Section 9 water crossing permit is required to coordinate NEPA requirements.

Re-Evaluating CEs

CEs may require re-evaluation (see EM Section 400.06) if:

  1. The project scope has changed.
  2. More than three years has elapsed since the last FHWA action.
  3. New environmental laws or regulations have been enacted.
  4. New ESA species have been listed.
  5. The project area has changed.

Methods for documenting Re-Evaluations


Guidance can be found on the SEPA Process web page and in the SEPA Online Handbook.