Wyoming Statewide Rule

Wyoming Erosion and Sediment Control Permit Requirements

Heavy RestrictionsApplies statewide across Wyoming (2026)

Wyoming requires erosion and sediment controls on construction sites under WYPDES Construction General Permits issued by DEQ. These statewide standards apply to qualifying sites regardless of city or county boundaries.

Key Facts

Threshold: 1 acre disturbance
Required Document: Site SWPPP
Common BMPs: Silt fence, basins
Inspection Frequency: Weekly typical
Lead Agency: Wyoming DEQ

Source: Wyoming Department of Environmental Quality

Full Breakdown

Wyoming DEQ's Construction General Permit, authorized by W.S. 35-11-301 and the federal Clean Water Act, requires operators of sites disturbing one or more acres to install erosion and sediment best management practices including silt fences, stabilized construction entrances, sediment basins, and seeding. Operators must prepare a SWPPP, conduct routine inspections, and submit Notices of Termination once final stabilization is achieved. Linear utility projects and oil and gas pads have specific BMP guidance. While conservation districts may consult on plans, DEQ retains primary enforcement authority. Local grading ordinances may add stricter controls but cannot weaken the state floor.

Violations & Penalties

Failure to implement BMPs or maintain a SWPPP can result in DEQ Notices of Violation, daily civil penalties up to $10,000, and stop-work orders.

Frequently Asked Questions

Are silt fences mandatory on Wyoming construction sites?

Silt fences or equivalent perimeter controls are standard BMPs required by most WYPDES SWPPPs to prevent off-site sediment discharge during construction.

Do Wyoming counties enforce erosion control?

DEQ has primary enforcement, but counties and conservation districts often review grading plans and may impose additional stormwater requirements through local ordinances.

Sources

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