Our Services

Installing septic systems and underground utilities since 1997.

Septic Systems

Septic Systems must be done right the first time. We will properly install your septic system to ensure years of…

Septic to Sewer

We offer septic to sewer conversions for clients in Clark & Cowlitz county. If you’re interested in converting from a…


Here in the Northwest, having good and reliable underground utilities is critical. Seppanen Construction will look to accomplish that for…

We also provide field mowing!

Call us today to get scheduled.

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