BSI PAS 100: Specification for Composted Materials

‘PAS100’ was developed by WRAP in conjunction with the Organics Recycling Group (formerly the Composting Association) to help create a market for recycled green and green-food waste as compost products.

The British Standards Institution’s Publically Available Specification 100 (BSI PAS 100) provides a baseline quality specification for compost, ensuring that it is safe and reliable to use.

PAS 100 includes requirements about how materials such as green and green-food waste can be processed, and is one of the fundamental pillars of the Compost Certification Scheme. Composts produced by an accredited site under the certification scheme can achieve ‘product status’, which means that they are no longer regulated as wastes.

Over a million tonnes of compost accredited under the Compost Certification Scheme are produced in the UK every year.  They are used as soil conditioners and renewable fertilisers in farming and landscaping. Accredited composts are also available to buy in many retail outlets as they are used as a sustainable alternative to peat in bagged composts.

PAS 100 updates

The British Standards Institution requires specifications to be reviewed periodically.  Following publication in 2002, PAS 100 was first updated in 2005 and then in 2011.  The Compost Certification Scheme now manages the review process and PAS 100 is under review through the winter of 2017-18.

Register for the full BSI PAS 100 compost specification >>
BSI PAS 100 FAQs >>



If you have purchased PAS 100 accredited compost, and you don’t believe it to meet the required standard, please visit the at the Compost Certification Scheme’s website.

Where next?

Want to know more about composting? Take a look at our reports, guides, tools and case studies for further information:

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