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

This page contains information on event mean concentrations for phosphorus and suspended sediment derived from the National Stormwater Quality Database. This data was updated in March 2020. We recommend using the updated table or data contained in these tables - Phosphorus; TSS - which provide a more comprehensive and up-to-date summary for event mean concentrations.

Event Mean Concentrations of pollutants in stormwater runoff by land use. Source: National Stormwater Quality Database (reviewed March, 2020).
Land use	Phosphorus EMC (mg/L)			TSS EMC (mg/L)
Land use	Median	Count	Std dev	Median	Count	Std dev
Commercial	0.11	165	0.144	97	164	168
Industrial	0.22	165	0.287	70	84	108
Open space	0.19	6	0.063	38	6	17.2
Residential	0.27	249	0.380	92	250	166
Download an Excel workbook containing this table.