What NEPA actually requires
NEPA requires federal agencies to consider the environmental impact of their actions before making decisions. That's it. It doesn't tell them what they can or can't do — it tells them they have to think about it, document the thinking, and let the public comment.
The work product that satisfies NEPA depends on how big the impact is.
Three levels of NEPA review
Categorical Exclusion (CatEx)
For routine actions with no significant environmental impact — minor renovations, equipment replacements, things on a pre-approved list. No further review required.
Environmental Assessment (EA)
For projects where impact isn't obviously zero. The EA documents direct, indirect and cumulative impacts and concludes either:
- Finding of No Significant Impact (FONSI) — project proceeds.
- Significant impact found — escalate to a full EIS.
Most federal building projects we work on land here. The goal is a clean FONSI.
Environmental Impact Statement (EIS)
For major federal actions with significant impact — new dams, highways, large facilities. Full public scoping, draft and final statements, formal review. Years, not months.
What an EA actually covers
A real EA looks at:
- Air and water quality
- Soil and geology
- Hydrology and floodplains
- Wildlife and habitat
- Cultural and historical resources (Section 106 territory)
- Noise and visual impact
- Environmental justice considerations
If any one of these comes back with significant impact, your EA either has to mitigate it or escalate to an EIS.
Common gotchas
- Scope creep. Owners describe a project narrowly to the engineer and broadly to the agency. The EA has to cover the full federal action, not just the construction scope.
- Inter-agency coordination. A geothermal test well in Nevada means BLM, NDEP, NDOM and the local jurisdiction all weigh in. Plan for the calendar, not just the technical work.
- Public scoping. Even an EA usually requires a comment period. Skipping it invites a challenge later.
Real example
On the Reno VAMC geothermal feasibility study, we ran the full NEPA process — EA scope, multi-agency permitting, FONSI determination — in parallel with the test well design. The project proceeded on schedule. The NEPA work didn't slow it down; it cleared the path.
Bottom line
NEPA is documentation, not obstruction. Treat it as part of the project plan instead of a check at the end, and it almost never delays you.