Compost

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Compost shall be stable, humus-like material produced from the aerobic decomposition of organic feedstocks, composted and cured until maturity. Compost shall be produced under the Compost Council of Canada’s Compost Quality Alliance (CQA) certification program through testing by an OMAFRA accredited soil laboratory, and certified as category ‘AA’ or ‘A’ under Ontario Compost Quality Standards.

Specifications for category 'A' product under Ontario Compost Quality Standards
ParameterAcceptable range
pH5.5 - 8.5
Soluble Salts (EC)< 5 mS/cm
Moisture Content< 50% by weight
Organic matter> 30% by dry weight
C/N ratio12 to 22
PathogensOMOECC 2012
MaturityOMOECC 2012
Particle size100% < 12.7 mm (1/2”)
Foreign Material> 1.0% by dry weight > 3 mm
< 0.5% plastic by dry weight
no foreign matter > 25 mm per 500 mL
no sharp foreign matter that could cause harm to humans or animals.
Arsenic≤ 13 mg/kg dry weight
Cadmium≤ 20 mg/kg dry weight
Chromium≤ 210 mg/kg dry weight</td
Cobalt≤ 34 mg/kg dry weight
Copper≤ 400 mg/kg dry weight
Lead≤ 150 mg/kg dry weight
Mercury≤ 0.8 mg/kg dry weight
Molybdenum≤ 5 mg/kg dry weight
Nickel≤ 62 mg/kg dry weight
Selenium≤ 2 mg/kg dry weight
Sodium, Percent Saturation< 2%
Zinc≤ 700 mg/kg dry weight