Tom,
I like your analogies. I have had a precast aerobic waste treatment system for my house since 1996. The systems have become much more economical since the late 90s and have become the standard to install around the area. The cost for me new was about $4k +$180/year maint. agreement. I am allowed (county/town)to discharge to three sprinklers for irrigation. Some towns in the area do require lateral lines instead.
Cheers,
JW
