Hunter Septic Design is a multi-generational family business in Washington State delivering clear, permit-ready septic designs across Thurston, Grays Harbor, Lewis, Mason, and Pacific counties. With 55 years of combined experience, we bring a customer-first approach and an industry-leading process that keeps projects moving—often completing designs during the first site visit.

Counties we serve: Thurston / Grays Harbor / Lewis / Mason / Pacific

Completed Projects: Large subdivisions (hundreds of lots) / New Construction / Difficult Waterfront repairs / Commercial septic systems / RV & Mobile Home Parks / Food Establishments / Hotels / Churches (and many more)