Why not use city compost in your garden? Ecological designer Darren Butler, at a class I was sitting in on, showed a soil report from a site that had used compost from the city of Los Angeles. LA’s compost contain biosolids, a euphemism for sewage. The soil test showed high levels of:
- zinc 196 ppm
- copper 76 ppm
- sulfur 5,752 ppm
The problem isn’t human waste, it’s all the other stuff that ends up in the sewer. I see a future when we’ll be responsibly composting human waste (see Joseph Jenkin’s website for how to do that). But watch out for that free city compost.
Update: A blog reader, Helane Shields, left an interesting series of links about biosolids in the comments. Thanks Helane!