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What you need to know if you plan to build a home requiring a septic system
If your building site is not in a sewered area, you will need a septic system. If properly sited, designed, and maintained, septic systems can be an efficient and cost-effective way to treat wastewater in your future home. However, if you are considering buying a lot and building a house in an unsewered area, there are many things you need to know.
Have A Home How Septic Systems Work
Living with a septic system requires a little more responsibility than being connected to a city sewer. It is a good idea to have a rough idea about the components of the system and the function of each component.
Soil and site characteristics
Conventional septic systems work because the soil removes pollutants from the sewage. Learn what soil inspections need to be done, and what the inspector will look for. 
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Plan to Build System Alternatives
In Indiana, a few types of alternative systems can be used, provided extensive monitoring is done. Read this if you have a difficult site, or want to look into alternatives to conventional septic systems.
Designing a system
Your septic system should be large enough for your family's present and future needs, based on your particular site conditions. Read this to understand how your contractor will design your system, or to participate in its design.
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Have A Home Permits and regulations
Septic systems require permits from your county health department. This page tells you more about the process of obtaining a permit.
Maintaining a septic sytem
Septic systems require maintenance by the homeowner. Make sure you know what you are getting into.