Originally Posted by arbarnhart
Be aware that you could run afoul of some regulations with respect to pump outs. It is a "spirit versus letter of the law" argument and its pretty easy to make a case for composting as a better alternative, but in some places (Canada, I think) if you have a head and no pump out you are subject to a hefty fine.
The law in Canada is in reference to having a holding tank and needing a pump out outlet. Porta-potties are fine as are composting toilets.