BMP pollutant removal for bacteria
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BMP pollutant removal for bacteria

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	Bacteria^a>
Bioretention^b	85
Filtration^c	85
Infiltration^d	100
Stormwater ponds	80
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.