Click on the link below to find a Septic System Professional. You can search for the services you need by zip code radius, or by specific company or person.
Here are a variety of resources describing what Septic Systems are and how they work.
From the US Environmental Protection Agency:
From the Consortium of Institutes for Decentralized Wastewater Treatment:Videos
Texas A&M University: Cool Interactive Graphic on How a Septic System Works
Texas A&M University: Overview of Septic Systems
University of Minnesota: Why and How to Treat Wastewater
University of Minnesota: Septic Systems Revealed
University of Minnesota: What is a Septic System?