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You are here: Home ›› Learn ›› Master Composter/Soil Builder Program

Master Composter/Soil Builder Program

Find out how Seattle residents are helping other Seattle residents manage organic wastes for a healthier city.

The Master Composter/Soil Builder (MC/SB) volunteer program is a key partner in Seattleā€™s waste reduction and recycling efforts. We help city residents to build worm bins, recycle food and yard waste at their homes, build healthy urban soils and support thriving landscapes throughout the city.

Sheet Mulching

Become A Master Composter/Soil Builder

If you love composting and you're interested in public education and outreach, apply to become a Mater Composter! Receive in-depth compost education with a team of diverse Seattle residents, then share your valuable knowledge and experience with the wider community. Find out more...

Current Master Composter/Soil Builders

If you have already received training, check for current information.

We Will Visit You Anywhere in Seattle!

Master Composter/Soil Builders volunteers will come to your location to share with your group what they know about composting food and yard waste, how to set up a worm bin or other compost system, and how you can build healthy soil.  Find out more...


Find out about the new Master Recycler Composter training in Kirkland!

Our Podcast

The Master Composters have put together an audio series. Enjoy listening to this crash course about how to think like a Master Composter and take advantage of some of the education which goes well beyond composting. Listen now.

What is Compost? How Do I Make It?

Learn about composting by reading some of our composting info sheets. 

Seattle Tilth offers composting classes. See if we have any upcoming classes.

About Us

The Master Composter/Soil Builder program is a part of the Natural Soil Building program, managed by Seattle Tilth and sponsored by Seattle Public Utilities.

We began in 1986, training volunteers to teach others about composting. We have shared our model with other organizations in the U.S. and they have created similar programs. Today there are more than 500 Master Composter training programs in North American and abroad.

Contact Us

Justin Maltry is the Master Composter/Soil Builder program coordinator. Contact him at:
(206) 633-0451 ext. 125 or


Enjoy this lively, professional video about composting! It's from "Growing A Greener World" with Joe Lamp'l, Nathan Lyon and Patti Moreno. Graham Golbuff, Resource Conservation Program Educator, leads a compost workshop and gives a little tour of our first community learning garden in Wallingford.




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