Standards for Compost


What are OMRI review standards for compost products?

Applications for compost products must include lab results for pathogens and heavy metals. Composts which have levels above the pathogen threshold will be listed as in a category which has the same restrictions as the Category: Manure-raw. Composts which do not meet the heavy metal requirements may receive a caution statement, or may be ineligible for OMRI listing. For information about maximum allowable levels of pathogens or heavy metals see the Review Standards for Lab Analyses information sheet in your Application Kit (you need to be logged in to the OMRI website to follow the link provided). Depending on the compost type, additional requirements may apply. See compost requirements by category in the OMRI Generic Materials List or Canada Standards Manual.