Mary, yes! you sure can have a disposal on a septic tank with no problems. thats just one of those old myths that didn’t go away. if your really concerned i.s.e.(in-sink-erator) just invented a disposer just for homeowners with septic tanks. the have admitted that it wasn’t really necessary, its a sales tool for customers who’ve heard the rumor. it actually injects some kind of septic system helper every time you run the disposer. i live in the country too, i have an I.S.E.333SS PRO disposer, its my #1 seller for good reason. it is sooo quiet i’ve had ladies not believe it’s running while they’re sitting at their kitchen table. it has a high (3/4) h.p motor and an all stainless steel grind chamber, they work great for many many years. you can visit http://www.insinkerator.com for details. jack