Median pollutant removal of bacteria by stormwater treatment practices. Values represent percentage of incoming pollutant load that is removed. Source: Minnesota Stormwater Manual. Manual data was based on information from ASCE/EPA International Database; Winer (2000)
| BMP group | Bacteriaa> |
|---|---|
| Bioretentionb | 35 |
| Filtrationc | 35 |
| Infiltrationd | 100 |
| Stormwater ponds | 70 |
| Stormwater wetlands | 75 |
aBacteria data include fecal streptococci, fecal coliform, E. coli, and total coliform
bData based on fewer than five monitoring studies
cExcludes vertical sand filters and filter strips
dNote that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in the infiltration facility; by-passed runoff does not receive any treatment.