Septic Required!!

[hierony]

I'd suggest reading the codes--they'll tell you a lot. Depending on where you are (the county/town sets the particular codes), there's different ways to deal with issues. Like Steve said, calling the code people and asking them for details is a pretty good way to understand how they'd take to your idea.

For instance, I know in Oregon having a composting toilet doesn't mean you can neglect a septic system (but you get to downsize it by 33%). If I recall correctly in Whitman County (Eastern Washington), the county health specialist (who happens to be a family doctor) would be the person to convince that you're dealing with fecal matter safely. You could also look into getting a variance.

In any case, it will help a great deal to have a definite plan to present. What kind (brand/model? NSF certified?) of composting toilet are you wanting to use? How often will it be emptied? How will it's contents (urine/mixed humanure/aged humanure) be 'disposed' of? Where is your property and who could you reasonably expect to have there (and how would you prevent them from accidentally coming in contact with pathogens)?

The other aspect of septic systems is general waste water treatment. How will you deal with all your gray water? From your washing machine? From your bathroom sink? From your kitchen sink? From your shower? Some of these (kitchen usually) are often considered 'black water' for code purposes (due to organic matter) and may require a septic system-type treatment.

My current method has been to use a traditional yurt (more easily moved and definitely temporary) and find someone (a small-scale/garden farmer; an unconventional-type person with a few acres; an old retired individual with land that could use a little money) that is adaptable/flexible. I don't know if this is similar to your situation though.