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State permit
COR400000: Colorado construction stormwater permit
COR400000 is the general permit Colorado Department of Public Health and Environment (CDPHE), Water Quality Control Division issues for stormwater from construction sites in Colorado. Effective / expires: 2024-04-01 / 2029-03-31. This page lists the rules a plan has to meet, each cited to the permit text or the agency page, checked October 20, 2026.
Sources last checked October 19, 2026. Prepared by our team led by Mohamed Elansary, PhD, with AI research tools. We are not a licensed engineering firm and do not seal plans.
General information; your permit text controls. Not legal advice and not engineering judgment. We make no promise of permit coverage, agency acceptance or compliance.
COR400000 at a glance
| Item | Rule | Source |
|---|---|---|
| Permit | CDPS General Permit, Stormwater Discharges Associated with Construction Activity (COR400000) | Source |
| Agency | Colorado Department of Public Health and Environment (CDPHE), Water Quality Control Division | Permit text, permit cover |
| Effective / expires | 2024-04-01 / 2029-03-31 | Permit text, permit cover |
| Refile | 2029-03-31: Coverage continues to expiry | Cover page |
| How to file (NOI) | Application in CDPHE's online system (CEOS), signed by the owner and the operator | Permit text, Cover (dates), Part I.A.3.j (expiration/continuation), Part I.C (SWMP), Part I.D (site inspections) |
| Fee | Annual fee under Regulation 61.15 (amount not listed in the permit) | Permit text, Cover (dates), Part I.A.3.j (expiration/continuation), Part I.C (SWMP), Part I.D (site inspections) |
| Who may write the plan | No license or seal; plan is a Stormwater Management Plan (SWMP) naming a Qualified Stormwater Manager | Permit text, Cover (dates), Part I.A.3.j (expiration/continuation), Part I.C (SWMP), Part I.D (site inspections) |
| Inspector | Qualified Stormwater Manager; staff or a third party hired by the permittee (Part I.D) | Permit text, Cover (dates), Part I.A.3.j (expiration/continuation), Part I.C (SWMP), Part I.D (site inspections) |
| Inspection frequency | Every 7 calendar days, or every 14 calendar days with post-storm inspections within 24 h after precipitation or snowmelt that causes surface erosion; every 7 days for Outstanding Waters; start within 7 days of commencement (Part I.D) | Permit text, Cover (dates), Part I.A.3.j (expiration/continuation), Part I.C (SWMP), Part I.D (site inspections) |
| What we cover | Plan preparation under this permit; the client files, inspects and keeps the plan on site. | Colorado hub and coverage by state |
What we do
We prepare the plan document. We do not stamp plans, visit sites or file the NOI; you file it. The site check at checkout applies the Colorado limits shown on the Colorado hub before payment.