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.


Online  and Advance Registration is now closed for GSDI's 2018 Spring Septic System Conference & Expo - March 19 & 20, 2018, The Manchester Down Hotel (formerly the Radisson), Manchester, NH.  Limited space is available for walk-up registration. To expedite the process, click on the link below and print out and complete the registration page.  Note that at this time, you must add $40 to each registration fee.

Click here to view the TENTATIVE program schedule. Please note that some program speakers or topics are subject to change.

Manchester Downtown Hotel, 700 Elm Street, Manchester, NH 03101

For Members Only! 2018-2019 Scholarship Application (Robert Woodman and Philip Beland Memorial Scholarships) 

Click here for this year's scholarship application.  Application deadline is April 6, 2018


Click the photo below  to view Chris Albert's presentation on Nitrogen, Septic Systems, Great Bay and Why it Matters


The latest from the NH Office of Professional Licensure and Certification about the licensing of septic evaluators in NH!

 The NH Office of Professional Licensure and Certification has recently set up the following website for the program. The administrative rules to run the program are currently under development.




 News & Events
  March 29, 2018
Landscaping for Water Quality in the Sunapee Area
Participants will learn how to use ecological landscape practices including rain gardens, vegetative buffers, and other green infrastructure to infiltrate stormwater and...
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