Article 730172 of misc.consumers.frugal-living:
Path: news.misty.com!not-for-mail
From: nicksanspam@ece.villanova.edu
Newsgroups: misc.consumers.frugal-living
Subject: Re: Anyone ever used a whole house composting toilet?
Date: 17 May 2008 07:45:33 -0400
Organization: Villanova University
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OhioGuy" <none@none.net> wrote:

>   Evidently they use evaporative technology coupled with very low flush
> toilets to essentially decrease runoff from the system to zero. In other
> words, no drainage or runoff to worry about, and no expensive septic
> system to install or maintain.  It would probably still cost around
> $6,000 to get installed, but it could handle two toilets and our family
> of 4 easily.

But maybe not greywater... This NSF-certified system could do both

http://www.epa.gov/ne/assistance/ceitts/wastewater/techs/norweco.html

but it costs more ($15K?) and requires some maintenance, eg replacing 
the aerator motor and adding chlorine hockey pucks.

Nick