The US Composting Council’s Seal of Testing Assurance Program (‘STA’) is a compost testing, labeling and information disclosure program.
The program requires participants to regularly test their compost products for a range of characteristics and properties, and to make this information available to all who request it.
Conformity with US Composting Council Seal of Testing Assurance's standard is verified by our own organization (second party) following A compost testing lab proficiency program is managed by CO State University
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Applicants are certified against the ecolabels’s criteria before using the label
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Other categories: compost
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Last updated: 20 January 2012