Metal |
Roof Materials |
Runoff Concentration (mg/L) |
Zinc |
New uncoated galvanized steel |
0.5-10 |
Old uncoated galvanized steel |
1-38 |
Coated galvanized steel |
0.2-1 |
Uncoated galvanized aluminum |
0.2-15 |
Coated galvanized aluminum |
0.1-0.2 |
Other (aluminum, stainless steel, titanium, polyester, gravel) |
<0.002 |
Copper |
Uncoated copper |
0.002-0.175 |
Uncoated galvanized steel |
<0.003 |
Clay tiles |
0.003-4 |
New asphalt shingles |
0.01-0.2 |
New cedar shakes |
1.5-27 |
Aged/patinated copper |
0.9-9.7 |
Lead |
Uncoated galvanized steel |
0.001-2 |
Coated and uncoated galvanized steel |
<0.0001-0.006 |
Painted materials |
<0.002-0.6 |