Stormwater Infiltration and soil/groundwater contamination: A guide to the Construction Stormwater Permit requirements

This page provides permit language and guides people to resources for evaluating infiltration of stormwater runoff at sites with potential or known soil and/or groundwater contamination.

Permit language

Permittees are prohibited from constructing infiltration systems where high levels of contaminants in soil or groundwater may be mobilized by the infiltrating stormwater. Permittees must either complete the MPCA's site screening assessment checklist or conduct their own assessment to determine the suitability for infiltration. The assessment must be retained with the SWPPP.

For more information and to access the MPCA's screening assessment tool see the Minnesota Stormwater Manual.

Determining if a site has high levels of contamination that may be mobilized

To determine if a site has concentrations of contaminants at high levels, link here.

MPCA's screening assessment tool

Access the MPCA's site screening assessment checklist

Access the guidance: Screening assessment for contamination at potential stormwater infiltration sites

Access example screening assessments

Guidance

Access guidance on Stormwater infiltration and contaminated soils and groundwater