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Granite State Onsite Wastewater Association A trade association of septic pumpers designers installers evaluators and consultants related to the onsite wastewater industry Find a Professional for Your Project Consumers use our handy search tool to find a designer evaluator installer or pumper near you. Become a Member of GSOWA Find out how being a member of GSOWA can benefit your business. PLEASE NOTE There is an email circulating offering to sell the list of attendees for the 2024 GSOWA Conference Expo andor a Member distribution list. GSOWA does not share the list of members or attendees and their contact information.