EPA Region 8 indicates about 60-90 days to review a minor-source permit with no comments or refined modeling, and 6-12 months for a synthetic-minor or PSD permit with comments or refined modeling
~60 days-12 months (Region 8 indicative estimates)estimate
| Value kind | estimate — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | One region's examples, not a national maximum and not the whole project schedule. A complete application, PSD pre-application modeling and any required ambient monitoring all come before the review clock starts. |
| As of | 2026-08-24 |
| Source | U.S. Environmental Protection Agency, Region 8 · Permit-type timeframe table; timing runs from receipt of a complete application and varies with modeling and public comment |
| Derivation | No national 6-36+ month band is inferred. Use the applicable agency's completeness, modeling, public-comment and statutory decision process in the project schedule. |
| Review | checking…review by 2027-04-12 · fast cadence |
| Recorded changes | last 2026-10-12 · 3 revisions tracked |
| Claim id | air-permit-lead-time-minor-source-6-12-mo-vs |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.