Situations where infiltration is prohibited or not recommended

Summary of situations where infiltration of stormwater runoff is prohibited or not recommended.
Link to this table

Condition	Prohibited	Not recommended	Not recommended unless conditions are met1
Local rule or ordinance prohibits infiltration	X
BMP is < 100 feet from drinking well in sensitive aquifer	X
BMP is < 50 feet from drinking well in a non-sensitive aquifer	X
BMP receives discharges from vehicle fueling and maintenance areas	if CGP applies2	X
There is less than 3 of separation to bedrock or saturated soil	if CGP applies		X
BMP receives discharges from certain industrial facilities	if CGP applies
BMP receives discharges from areas of contaminated soil	if CGP applies		X
Infiltration into BMP will mobilize contaminants in soil or groundwater	if CGP applies	X
BMP is located in D soils, unless infiltration allowed by LGU	if CGP applies		X
BMP is 1,000 feet up-gradient or 100 feet down-gradient of active karst, unless infiltration allowed by LGU	if CGP applies	X
BMP is located within a DWSMA, unless infiltration allowed by LGU	if CGP applies
BMP is located within 1 year travel time of drinking supply well		X
BMP is located in soils with infiltration rate > 8.3 in/hr	if CGP applies		X
BMP located within 10 feet of building or structure			X
BMP located within 35 feet of a septic system			X
BMP located less than 200 feet from toe of slope that exceeds 20%		X
BMP receives discharges from a confirmed stormwater hotspot			X
A mound beneath the BMP extends into the BMP		X

¹see discussion below for conditions under which infiltration is acceptable.
²CGP = Construction Stormwater General Permit