Arapahoe County, CO Environmental Rules: Erosion Control (2026)
Key Facts
- Permit required
- GESC Permit for regulated land disturbance
- Applies to
- Unincorporated Arapahoe County only
- Timing
- Obtain before land disturbance starts
- Coordination
- Issued before or with building permit
- Governing manual
- Arapahoe County GESC Manual (adopted by reference)
- Enforcing agency
- PWD Director under the Board of Commissioners
- Violation type
- Zoning violation, enforcement action by county
Summary
Unincorporated Arapahoe County requires a Grading, Erosion and Sediment Control (GESC) permit before any regulated land disturbance begins. The permit, issued under the county's GESC Manual, applies countywide outside incorporated cities and must be secured before or alongside your building permit: skipping it is a zoning violation.
b. Applicability i. These Regulations shall apply to all property within the unincorporated areas of Arapahoe County. ii. No land disturbance shall occur on any property, unless otherwise exempted via provisions in the GESC Manual without first obtaining a GESC permit from the County. Such permit is subject to all applicable fees. iii. Persons proposing to conduct regulated land disturbance activities must apply for a GESC permit... A GESC permit shall be obtained prior to the start of the land disturbing activities even if a Federal or State agency or other jurisdiction has approved the project and issued a permit. 2. PROCEDURAL REQUIREMENTS a. Anyone proposing an activity requiring a GESC permit, as described in the GESC Manual, shall submit the required information as detailed in the GESC Manual, along with all applicable permit fees. No person shall engage in any regulated land disturbance activity without first obtaining a GESC permit. A GESC permit must be issued prior to or concurrent with the issuance of a building permit.
Full Breakdown
" The regulations apply to all property within the unincorporated areas of Arapahoe County, and no land disturbance may occur without first obtaining a GESC permit from the county unless the GESC Manual exempts it, the permit carries its own applicable fees. Anyone proposing a regulated land-disturbance activity, including construction of a temporary batch plant, must apply for a GESC permit (or a Temporary Batch Plant GESC permit) and obtain it before land-disturbing work starts, even if a federal or state agency has already approved the project.
A GESC permit must be issued prior to or concurrent with the building permit, and the applicant must submit the information the GESC Manual requires along with all fees. Even projects exempt from GESC permitting must still use Best Management Practices (BMPs) for any clearing, grading, or land disturbance. 3, Tree Preservation. The county reviews GESC plan submittals for general compliance, but acceptance does not relieve the owner or designer of responsibility for their calculations, plans, specifications, or as-built work, nor does it excuse compliance with other federal, state, or local rules, where a federal or state standard is stricter, the more restrictive requirement controls. The GESC Manual itself can be amended by the Board of County Commissioners on recommendation of the PWD Director or Planning Commission.
Violations & Fines
The Board of County Commissioners, acting through the Public Works and Development (PWD) Director, enforces § 5-4.2. Failure to comply with any term, condition, limit, or deadline of the GESC Manual or a GESC permit, or failure to obtain a GESC permit at all, is treated as a zoning violation subject to county enforcement action, separate from any building-permit consequences.
Frequently Asked Questions
Do I need a permit to disturb land in unincorporated Arapahoe County?
Does an approved federal or state permit excuse me from the county GESC permit?
If my project is exempt from the GESC permit, do I still need erosion controls?
What happens if I skip the GESC permit?
Sources & Official References
Other rules in Arapahoe County
Compare Arapahoe County to another location·View the Colorado environmental rules overview
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