Composting toilet & porta potty rental

[A friend indeed]

Probably due to lack of demand, and the fact that you have to install a septic tank anyway.

 You may be correct as to lack of demand, but I was under the impression that Composting Toilets were an approved alternative to Septic systems for human waste.  There is of course the issue with gray water , and the proper disposal of the same (from sinks, showers etc.) requires some form of system to treat the effluent from such.  Nevertheless, many of the sustainable living ilk seems to talk a lot about composting systems.  I am just surprised that no one knows of any distributors on the island.  Most talk on FB pages, etc., describe available systems and talk of shipping from the mainland.   I saw a post of how one person installed a NSF approved system that produces Bio -methane (?) gas that is captured and used in heating (food, water) effectively here on the the island.

https://www.homebiogas.com/Products/HomeBiogas_Toilet