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Understanding the STA Compost Program: Quality Assurance for Compost Products

The STA (Seal of Testing Assurance) program, developed by the US Composting Council, ensures that compost products meet rigorous testing standards. It consists of three integral elements: the STA seal for verified testing, the TMECC guidelines for evaluating compost quality, and the CAP program for laboratory quality assurance. Together, these initiatives provide a comprehensive framework for maintaining the integrity and reliability of compost products, helping consumers and producers alike to trust the quality of compost in the market. For further details, visit the [Composting Council website](http://www.compostingcouncil.org/programs/sta).

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Understanding the STA Compost Program: Quality Assurance for Compost Products

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  1. If it isn’t STA Compost…… What is it? (see entire program explained at: http://www.compostingcouncil.org/programs/sta)

  2. STA Program Elements STA (Seal of Testing Assurance) method is developed, implemented and updated regularly by the US Composting Council (http://www.compostingcouncil.org/programs/sta). The STA system is composed of three interdependent systems or programs of: • Seal of Testing Assurance (STA) – Assures that your compost has been testing using established and agreed upon compost testing methods, and provides a detailed test report of the parameters • Test Methods for the Evaluation of Compost and Composting (TMECC) – which provide detailed protocols for the composting industry to verify the physical, chemical, and biological condition of composting feedstocks, material in process and compost products at the point of sale. • Compost Analysis Proficiency (CAP) program – a laboratory quality assurance program which is conducted as tri-annual exchanges of three [3] compost materials, each submitted in blind triplicate (3 × 3 × 3 = 27) for each of two testing tiers. Tier I. Inorganic; and Tier II. Inorganic plus Biological.

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