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Master Composter/Sustainability Steward Training

Interested in learning more about compost and preventing waste, then teaching others? Become a Master Composter/Sustainability Steward! 


Seattle residents are invited to apply to participate in the Master Composter/Sustainability Stewards course – a free volunteer training program with a community outreach component. 

Each Master Composter/Sustainability Steward participates in 30 hours of classroom learning (combined online and hands on learning) followed by 35 hours of volunteer outreach, which could include projects such as giving composting classes at schools and civic associations, helping schools and community gardens set up a compost system and teaching Seattle residents about waste prevention at in-person and online events.  Farm Fest Waste Station 2021

The training course covers the following topics: BeetBox and MCSS OTS Worm Bin Build 2021

  • preventing waste
  • improving soil health and building soil lifeMCSS 2021 Hot Pile Build
  • understanding the small-scale composting process
  • using finished compost
  • sorting your compostable and recyclable waste
  • managing stormwater and protecting water quality
  • teaching others about composting and resource conservation practices 

Class Dates and Times

The training is an in-depth educational experience with online Zoom sessions and hands-on training at each of our demonstration gardens. 
  • Six Wednesdays, 7-9 p.m. on March 2, 9, 16, 23 and 30, April 6 
  • Five Saturdays, 10 a.m.-3 p.m. on March 12, 19, and 26, April 2 and 9        

Training Location


Community outreach is an essential component of the MC/SS program and a powerful form of environmental action! Following your MC/SS training, you will become part of a select team of Seattle residents empowered to share what you have learned with friends, neighbors and the community at large. We'll make sure you have the support you need to be successful at teaching others.    Promatoras at Salsa de la Vida Farm making compost 2021

Requirements for Applicants

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The Master Composter/Sustainability Steward program is a partnership with Seattle Public Utilities.


Find out more about the Master Composter/Sustainability Stewards program or contact Reingard Rieger: or (206) 633-0097.

Seattle Public Utilities Master Composter/Sustainability Stewards logo

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