Example Infiltration Requirements in the Twin Cities Metro Area (2009) Example Infiltration Requirements in the Twin Cities Metro Area (2009)

Information: Note these were infiltration requirements in 2009. These are examples for illustration purposes. Some of these requirements have likely changed since 2009.

Example Infiltration Requirements in the Twin Cities Metro Area (2009)
Link to this table

Municipalities
Entity	Infiltration Requirement	Requirement Applies To
Afton	0.6”	Impervious area
Inver Grove Heights NWA	3.6” Pre-Post	Entire site
Lakeville	1.5”	Impervious area (within areas draining to trout waters)
Woodbury	0.5”	Entire site
Maplewood	1”	Entire site
Watershed Districts
Entity	Infiltration Requirement	Requirement Applies To
Brown's Creek	2.8” Rainfall Event Pre-Post, 3.6” Rainfall Event if Landlocked	Entire site
Capitol Region	1”	Impervious area
Comfort Lake-Forest Lake	2.8” Rainfall Event Pre-Post, 3.6” Rainfall Event if Landlocked	Entire site
Minnehaha Creek	1”	Impervious area
Nine Mile Creek	1”	Impervious area
Prior Lake-Spring Lake	0.5”	New Impervious
Ramsey-Washington Metro	1”	Impervious area
Watershed Management Organizations
Entity	Infiltration Requirement	Requirement Applies To
Scott County	0.5”	New impervious area
Vermillion River	2.8” Rainfall Event Pre-Post	Entire site
Shingle Creek	0.5”	Impervious area
West Mississippi	0.5”	Impervious area
Upper Rum River	0.5”	New impervious area