Septic System Installation

A properly designed and installed septic system is essential for any manufactured home on rural property without access to municipal sewer. 3-A Construction, LLC holds Oregon Department of Environmental Quality (DEQ) License #39002, authorizing us to install both conventional and alternative septic systems across the state. With over 20 years of experience and thousands of systems installed, we have the expertise to navigate Oregon's strict septic regulations and deliver a system that performs reliably for decades.

Every septic installation begins with soil evaluation and percolation testing. We coordinate with a licensed soil scientist or conduct preliminary assessments to determine your soil type, seasonal water table depth, and drainage characteristics. These findings determine whether a conventional gravity-fed system will work or whether an alternative system such as a pressure-distribution, sand filter, or mound system is required. We guide you through the options and recommend the most cost-effective solution for your property.

Once the system design is approved by Oregon DEQ, our crew handles all excavation, tank placement, distribution line installation, and drain field construction. We install concrete, fiberglass, and polyethylene septic tanks sized appropriately for your household. Every component is placed to precise elevations and grades, and we perform flow testing before backfill to verify the system operates correctly.

Oregon DEQ requires septic system permits for all new installations and has specific setback requirements from wells, property lines, waterways, and structures. We handle the entire permitting process, prepare all required documentation, and schedule DEQ inspections at each required stage. Our familiarity with county-specific requirements throughout Oregon means fewer delays and no permit surprises.

Because we also provide complete site development and home installation services, your septic system is designed and installed as part of a coordinated site plan. This ensures the drain field location, tank access, and utility routing all work together without conflicts. Hiring a single contractor for the entire project means better communication, fewer scheduling gaps, and a lower overall cost.