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 aquifer3 | X | ||
| BMP is < 50 feet from drinking well in a non-sensitive aquifer3 | 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 facilities4 | if CGP applies | ||
| BMP is areas where high levels of contaminants in soil or groundwater will be mobilized by the infiltrating stormwater | if CGP applies | X | |
| BMP is located in D soils, unless infiltration allowed by LGU with a current MS4 permit | if CGP applies | X | |
| BMP is 1,000 feet up-gradient or 100 feet down-gradient of active karst, unless infiltration allowed by LGU with a current MS4 permit | if CGP applies | X | |
| BMP is located within a DWSMA, unless infiltration allowed by LGU with a current MS4 permit | if CGP applies | ||
| BMP is located in soils with infiltration rate > 8.3 in/hr unless amended or infiltration allowed by LGU with a current MS4 permit | if CGP applies | X | |
| BMP is located within 1 year travel time of drinking supply well | 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 groundwater mound formed beneath the BMP during infiltration extends into the BMP | X |
1see discussion below for conditions under which infiltration is acceptable.
2CGP = Construction Stormwater General Permit
3See Minnesota Rules Chapter 4725
4To determine if infiltration is allowed for a specific industrial sector or subsector, go to the list of sectors, select the sector of interest, and review section 8 for that sector (Use of Infiltration Devices and/or Industrial Stormwater Ponds for Stormwater Treatment and Disposal)