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.

What's New?

Exhibitor at GSDI's 30th Annual Spring Septic System Conference & Expo - March 13 & 14, 2017, Radisson Hotel, Manchester, NH

Click here for a copy of the exhibitor application.  Avoid the price increase that takes place after January 27!


2017-2018 Woodman and Beland Scholarship Application Form Now Available!


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