Wisconsin
Stormwater Pollution Prevention Plan (SWPPP)
SWPPP preparation and permit coverage for construction sites disturbing 1 acre or more, as required under the Clean Water Act.
What the work involves
Construction that disturbs 1 acre or more, or is part of a larger common plan of development that will, generally needs NPDES construction stormwater permit coverage from EPA or the state. A SWPPP describes erosion and sediment controls, pollution prevention, inspection schedules and responsible parties, and is filed with a Notice of Intent. Some states and localities require a registered engineer or certified professional to prepare it, and require periodic inspections during construction.
Local conditions we plan for
- Deep frost penetration
- Heavy snow loads
- Great Lakes shoreline erosion
- Karst in the southwest Driftless Area and Door County
Building code: IBC 2021 statewide for commercial buildings; one and two family dwellings use the state Uniform Dwelling Code instead of the IRC (ICC adoption chart, April 2026).
When you need it
- Disturbing 1 acre or more of land
- Smaller lot that is part of a larger subdivision or common plan
- State or local permit requires a SWPPP
- Inspector cited missing or outdated SWPPP
Frequently asked questions
How much does stormwater Pollution Prevention Plan (SWPPP) cost?
Across the US, stormwater Pollution Prevention Plan (SWPPP) usually costs $1,000 to $15,000. Estimate. No authoritative national price survey was found. Small sites are commonly a few thousand dollars or less, while large multi-phase projects cost more; inspections during construction are usually billed separately.
How long does stormwater Pollution Prevention Plan (SWPPP) take?
Plan on 1 to 3 weeks to prepare; coverage timing depends on the permitting authority from signed proposal to stamped deliverables, longer if a site visit, soil testing or a permit review cycle is involved.
Do I need a licensed PE for stormwater Pollution Prevention Plan (SWPPP)?
In most US jurisdictions, yes. When the work needs a permit, the plans, calculations or report usually must be sealed by a Professional Engineer licensed in the state where the project is located. Every deliverable we issue for permit is sealed that way.
How do I verify an engineer's license in Wisconsin?
Engineers practicing in Wisconsin are licensed by the Wisconsin Examining Board of Architects, Landscape Architects, Professional Engineers, Designers and Professional Land Surveyors. You can confirm a license number and its status in the board's public license search before you sign a contract.
How deep is the frost line in Wisconsin?
Wisconsin Uniform Dwelling Code SPS 321.16 requires footings to be below frost penetration or at least 48 inches below adjacent grade, whichever is deeper (one and two family dwellings). Local building departments set the required footing depth, so confirm the exact figure for your county before designing foundations or retaining walls.
Which building code applies in Wisconsin?
IBC 2021 statewide for commercial buildings; one and two family dwellings use the state Uniform Dwelling Code instead of the IRC (ICC adoption chart, April 2026). Cities and counties can add local amendments, which is one reason to hire an engineer who works in your area.