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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
  December 9, 2014
GSDI Annual Meeting 2014
Click here for the meeting flyer and registration form for the GSDI 2014 Annual Meeting!
  March 16, 2015
2015 Spring Septic System Conference & Exposition
Attendee program and registration information will be made available after January 1, 2015. Exhibitor registration information will be made available in early Fall 2014....
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Welcome to Granite State Designers and Installers : Granite State Designers and Installers