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|STA Certified Compost - Test Result Limits for Compost Manufacturers|
STA Certified Compost participants must meet the EPA testing limits for heavy metals AND pathogens in every CTDS (Compost Technical Data Sheet) for every STA Certified Compost product.
Metals- maximum concentrations expressed on a dry weight basis (Chromium and Molybdenum do not have EPA limits)
Arsenic (As) 41 mg/Kg
Cadmium (Cd) 39 mg/Kg
Copper (Cu) 1500 mg/Kg
Lead (Pb) 300 mg/Kg
Mercury (Hg) 17 mg/Kg
Nickel (Ni) 420 mg/Kg
Selenium (Se) 100 mg/Kg
Zinc (Zn) 2800 mg/Kg
Pathogens- pass either Fecal Coliform or Salmonella, at the manufacturers choice. Must pass both in California.
Fecal Coliform maximum concentrations
< 1000 MPN / gram of dry compost
Salmonella maximum concentrations
< 3 MPN / 4 grams of dry compost