It may seem complicated—and it does depend on where you live— but it is relatively easy to get an eco-toilet installed in your home. We recommend doing your homework, finding out what is already permitted in your state/municipality, then contacting the eco-toilet manufacturer to see if they can recommend local dealers and plumbers who can do the installation.
For people in the Cape Cod area, here are some links to sign up for the Falmouth demonstration project and a guide to Massachusetts regulations.
The Green Center 