Over 25 Years of experience

 Seppanen Construction has been providing septic system installation, excavation and underground services to residents and contractors in Clark & Cowlitz County since 1997. We are known for our reliability, professionalism, and knowledge of all types of septic systems. Brian Seppanen has been operating an excavator since high school and runs his business with integrity and expertise. We do both contractor and homeowner excavation services all over SW Washington including Clark, Cowlitz, Wahkiakum, and Lewis County. We’re happy to give a bid- contact us!