Several types of private sanitation systems are in use today including the traditional septic tank and leach field, aeration systems, and "mound" systems. They can vary widely in cost, and not all health districts allow all types. The choice of system will also be heavily weighted by the soil type and slope of the lot, and the available area(s) for the system. A typical leach field system will require a large clear area for a primary and second field.
Since a private sanitation system is more expensive than connecting to a public system, the cost isn't typically considered in the "base" cost of building a house. A private sanitation system is usually an "extra."
Slope, Sun, Soil, and Sewer - keep these in mind when selecting a property to build on and when designing your home and you'll have a more successful project!
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Richard Taylor is a residential architect based in Dublin, Ohio and is a contributor to Zillow Blog.
Note: The views and opinions expressed in this article are those of the author and do not necessarily reflect the opinion or position of Zillow.