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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
  May 12, 2015
Granite State Certified Septic Evaluator Training Program
Attend this two-day training program (classroom and field sessions) then prepare to sit for the written exam (given at the GSDI offices in Concord at a date and time...
  May 16, 2015
Granite State Certified Septic Evaluator Training Program
Attend this two-day training program (classroom and field sessions) then prepare to sit for the written exam (given at the GSDI offices in Concord at a date and time that...
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Welcome to Granite State Designers and Installers : Granite State Designers and Installers