Associate Utilities
- City of Anacortes, WA
- City of Bellingham, WA
- City of San Francisco, CA
- City of Missoula, MT
- City of Vancouver, WA
Nonprofits
- California Association of Sanitation Agencies
- Mid-Atlantic Biosolids Association
- New Zealand Land Treatment Collective
- North East Biosolids & Byproducts Association
- Professional Training Association
- Washington Organic Recycling Council
Regulators