[Greenbuilding] New approaches to Septic?

[bill.allen at verizon.net]

Hi All,

I am currently in the design stage of a remote vacation/retirement home.  It will be Leed platinum, passive house, net zero, etc.  What seems to have changed very little over time is how to approach the septic system.  Between the house and a separate garage apartment, I could have up 5 or 6 bedrooms I need to address.

Are there any new approaches to dealing with septic?  All I have been able to find are the traditional tank and leach field or individual composting toilets. 

 The house will be in NE PA for code compliance. Any thoughts would be greatly appreciated. 

Bill