I've lived in three homes now (two of which I built and the other one was an extensive remodel) all of which were on septic systems. They all had garbage disposers (two in fact in one of the homes). I have had no septic problems over the years (5 - 15yrs). However, when I'm inspecting homes on septic systems and I run across a disposer in the kitchen (which by the way is quite frequent), I recommend to the client(s) not to over use it (meaning don't throw everything down them).

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RJDalga
Home Analysts, Inc.
Kalamazoo, MI