Necessary, Inc. hopes that this site will be helpful to anyone needing information about on-site sewage facilities. We have compiled a list of links that provide access to most if not all of the web sites of the agencies that govern the operation and regulation of these facilities. We also strive to provide the answers to the most common questions people have when having to deal with them. Please feel free to contact us if you need help with your system or future septic system needs.