Literature is available from manufacturers of the more complex, factory built systems.
The case studies describing the use of on-site systems to solve the wastewater problems of small communities were useful in some cases. Septic systems are a good example of a system which has been managed in various ways , but for which the costs reported in the literature are often incomplete, too site-specific, or dated. A mailing was then made to 125 manufacturers of on-site systems and components taken from listings maintained by the EPA Small Wastewater Flows Clearinghouse and the National Sanitation Foundation . Over 60 responses were obtained, providing literature on a complete range of equipment from plastic liners and piping to complete package wastewater treatment plants. Additional information was requested as needed during the project.