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Granite State Designers and Installers Association is New Hampshire's trade association for those working with on-site subsurface wastewater disposal systems. This website provides background about the organization and useful information for homeowners such as the care and maintenance of septic systems and how to find a qualified septic designer, installer, and evaluator.  Professionals will find links to all rules and laws concerning septic systems as well as a complete listing of a calendar of events.

 News & Events
  March 14, 2016
29th Annual GSDI Spring Septic System Conference & Expo
Registration is now open for the 29th GSDI Spring Septic System Conference & Expo ... March 14 & 15, 2016 at the Radisson Hotel in Manchester, NH. Join us for two...
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Welcome to Granite State Designers and Installers : Granite State Designers and Installers