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|
|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.