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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
  November 2, 2018
Septic System Continuing Education Class
Granite State Designers and Installers Association is pleased to present Sara Heger from the University of Minnesota and Dennis F. Hallahan, Technical Director, Infiiltrator...
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Welcome to Granite State Designers and Installers : Granite State Designers and Installers