Certifications are problematic. First, they do not address what happens to the solid material once it’s removed from the toilet – and that is the most important thing! Any composting toilet could possibly have fecal pathogens in the solid waste that you remove. It is critical that this waste be carefully handled according to instructions, and that fecal contamination does not occur. The certifications provide absolutely no assurance of that.
Thirdly, there is no universal agreement among government agencies on certification, what it means, what should be tested, or what should be required. In my personal experience, composting toilet certification is confusing to everyone, and being certified is in no way a guarantee that a toilet will be approved.
New Guidelines on Composting Toilets
Very detailed,comprehensive guidelines on composting toilets have recently been published. This was an extremely well thought out process, written by an engineer and peer reviewed. These are probably the best, most thorough guidelines on composting toilets available. Although published in Canada, I am hopeful they will be read and adopted widely by governments across North America. You can get a copy at the link below, print it, and take it to your local authorities when you apply for a permit. Show them you are adhering to these guidelines, and that your installation will be properly done, with no health risk possible. BC government guidelines on composting-toilets.