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Master Composter/Sustainability Steward Training

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


MCSS Volunteers 1Seattle residents are invited to apply to participate in the Master Composter/Sustainability Stewards course – a five week, nine session volunteer training program with a community outreach component. 

Each Master Composter/Sustainability Steward participates in 33 hours of classroom learning (including field trips) 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 staffing compost information tables at community events.

MCSS Volunteers 2Master Composter / Sustainability StewardsThe training course covers the following topics:

  • improving soil health and building soil life
  • understanding the small-scale composting process
  • using finished compost
  • preventing waste
  • sorting your compostables and recyclables
  • Master Composter / Sustainability Stewardsmanaging storm water and protecting water quality
  • teaching others about composting and resource conservation practices

Attend an upcoming volunteer orientation to learn more about all of Tilth Alliance's volunteer opportunities in Seattle and King County.

Class Dates & Times

The training is a five week (9 sessions) in-depth educational experience with four Wednesday evenings and five Saturday sessions.

  • Four Wednesdays, 7-9 p.m. on Apr. 1, 8, 15 and 22
  • Five Saturdays, 10 a.m.-3 p.m. on Mar. 28, April 4, 11, 18 and 25

Training Location

At the Good Shepherd Center, 4649 Sunnyside Ave N., Seattle, WA  98103.
Get directions
. There are also two off-site field trips.

Community Outreach

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.  

Requirements for Applicants

Apply by Thu., Feb. 20!


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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