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<td>Hard Roofs*</td>
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<td>Hard Roofs<sup>1</suo>*</td>
 
<td>&#9675;</td>
 
<td>&#9675;</td>
 
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<td>Green and Brown Roofs**</td>
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<td>Green and Brown Roofs<sup>2</sup></td>
 
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<td>&#9675;</td>
 
<td>&#9675;</td>
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&#9679; = relatively high concentrations
  
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&#9675; = relatively low concentrations
 
 
  
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<sup>1</sup>Metals are highly dependent on roof type-only certified membrane roofs are currently approved for potable through NSF. 
  
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<sup>2</sup>Vegetated 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.
  
  
 
[[category:Table]]
 
[[category:Table]]

Revision as of 14:23, 18 August 2016

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</suo>*
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.