NOTE: This page originally contained information from the National Stormwater Quality Database. We recently completed a literature review of event mean concentrations of total phosphorus and total suspended sediment in stormwater runoff. We recommend using information from this recent review rather than the data from the National Stormwater Quality Database.

National Stormwater Quality Database-derived event mean concentrations for phosphorus and TSS


Event Mean Concentrations of pollutants in stormwater runoff by land use. Source: National Stormwater Quality Database.
Link to this table

Land use Phosphorus EMC (mg/L) TSS EMC (mg/L)
Low Medium High Low Medium High
Commercial 0.15 0.25 0.35 120 140 160
Industrial 0.15 0.25 0.25 130 150 170
Institutional 0.15 0.25 0.35 100 120 140
Multi-use 0.3 0.4 0.5 120 140 160
Municipal 0.2 0.3 0.4 120 140 160
Open space 0.1 0.2 0.3 70 90 110
Residential - high density 0.3 0.4 0.5 120 140 160
Residential - low density 0.4 0.5 0.6 130 150 170
Residential - medium density 0.2 0.3 0.4 100 120 140
Transportation 0.3 0.4 0.5 115 135 155

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