Typical pollutants found in stormwater collected from different source areas

Link to this table

Source Area Solids Total suspended solids Nutrients Bacteria Metals Chloride Grease, Oil Pesticides Other chemicals
Hard Roofs1
Green and Brown Roofs2
Paved Surfaces (parking lots, sidewalks, driveways and roadways)
Green Spaces (lawns and park areas)

● = relatively high concentrations
○ = relatively low concentrations
1Metals are highly dependent on roof type-only certified membrane roofs are currently approved for potable through NSF.
2Vegetated roofs and pervious pavers have had poor performance due to discoloration of water and difficulty filtering the water to levels that the UV treatment is effective.

This page was last edited on 16 April 2020, at 18:11.