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 12, 2018
Navigating the NHDES Website...OneStop and Subsurface ePermitting
Join us for a three-hour training program for those who need help learning to navigate the NHDES website including how to access OneStop and how to submit plans and manage...
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Welcome to Granite State Designers and Installers : Granite State Designers and Installers