SWPPP Requirements in Minnesota

Who needs a SWPPP in Minnesota?

Any construction project that disturbs one acre or more — or is part of a larger common plan of development reaching one acre — needs a SWPPP under Minnesota permit MNR100001.

Minnesota runs its own delegated stormwater program. Operators obtain coverage from MPCA under NPDES/SDS Construction Stormwater General Permit (MNR100001), not directly from the EPA. A small subdivision, a solar pad, and a road-widening project all clear the same one-acre line.

Minnesota adds requirements worth flagging early: Owner and operator are both permittees; apply online with the fee through MPCA e-Services before construction; the SWPPP must be complete before applying (items 2.2, 3.2, 3.5); Projects disturbing 50 acres or more with a discharge point within one mile of, and flowing to, a special or impaired water submit the complete SWPPP with the application at least 30 days before construction (item 3.4); SWPPP names a person knowledgeable in erosion prevention and sediment control BMPs who coordinates all contractors and oversees SWPPP implementation (item 5.21); SWPPP lists estimated quantities of all erosion prevention and sediment control BMPs for the life of the project, and pre- and post-construction impervious acres (items 5.7–5.8); SWPPP maps surface waters, wetlands, and ponds within one mile that will receive site stormwater, and identifies special and impaired waters (item 5.10); Temporary sediment basin where 10 or more disturbed acres drain to a common location (5 acres for special or impaired waters) (items 14.2 and 23.10); Permanent stormwater treatment of a water quality volume of 1 inch times the net new impervious surface where the project creates one or more acres of net new impervious surface (items 15.3–15.4); Remove sediment from paved surfaces within one calendar day of discovery, and deltas and sediment in surface waters or drainage systems within seven calendar days (items 11.5–11.6); Photograph dewatering discharges at the start and at least every 24 hours of operation (items 10.2 and 11.9); Submit the NOT within 30 days after the Section 13 termination conditions are met, with photographs showing permanent cover (items 4.2 and 13.8).

What the plan must contain

A Minnesota SWPPPis the site's compliance binder — the document an inspector opens first. It documents:

1. 1Site & project descriptionTotal and disturbed acreage, soils, slopes, and the sequence of construction.
2. 2Receiving waters & discharge pointsWhere stormwater leaves the site and the waterbodies it reaches.
3. 3Erosion & sediment control BMPsSilt fence, stabilized entrances, inlet protection, and stabilization measures.
4. 4Inspection schedule & recordsDated, signed inspection logs and the corrective actions taken.
5. 5Operator certificationThe SWPPP is signed by the legally responsible party before work begins.

Required and conditional BMPs

Filing your Notice of Intent

Submit the permit application and fee online through MPCA e-Services (cover page; item 3.2).

A Notice of Termination closes coverage once the site reaches final stabilization. Keeping the SWPPP and its inspection records on site is what keeps a project clear of stop-work orders.

Inspection requirements

Inspect at least once every 7 calendar days and within 24 hours after a storm producing more than 0.5 inch of rain in 24 hours (during active construction, by a trained person) (MNR100001 item 11.2). Every inspection is dated and signed, and any failed control is corrected before the next storm.

How Minnesota differs from the federal permit

Because Minnesota administers its own program, the federal EPA Construction General Permit does not apply directly here — the state permit governs. Sites inside a regulated municipal storm sewer system may carry additional local ordinance requirements on top of the state permit.

Frequently asked questions