Practical Septic Design for Kitsap and Pierce Counties

Septic design, perc testing, and property guidance for new construction, replacement systems, ADUs, remodels, and land feasibility.

American Septic Design works with homeowners, land buyers, builders, and other property owners who need clear answers about what a site can support and what it will take to move a project forward. Our primary service areas are Kitsap County, Pierce County, Mason County and Vashon Island.

If you are buying land, dealing with a failed septic system, or planning an ADU, addition, or remodel, the first step is understanding what is actually possible. Soil depth, setbacks, topography, and county requirements all affect the design. We help clients sort through those factors early so the project can move forward with fewer surprises.

Start with a county page

We now have dedicated county pages for people who want more location-specific septic design information.

Kitsap County Septic Design for Poulsbo, Silverdale, Bremerton, Port Orchard, Bainbridge Island, Kingston, and nearby communities.
Pierce County Septic Design for Gig Harbor, the Key Peninsula, East Pierce County, and nearby areas.

Core Services

Perc Testing and Site Evaluation

Site and soil evaluation to help determine what type of septic system may be possible on the property.

New Construction Septic Design

Code-compliant septic design for new homes and undeveloped properties.

Repair and Replacement Design

Practical design work for failed systems and replacement projects where layout options may be limited.

ADU, Addition, and Remodel Planning

Guidance on whether an existing or proposed septic system can support the project you want to build.

Property Feasibility

Early-stage review for buyers and owners who need to know whether a site is worth pursuing.

Selected Light Commercial Work

Design support for smaller commercial projects where septic planning is part of the approval process.

A Straightforward Approach

Septic design should start with the real conditions on the property, not assumptions. People are often told an old tank can be reused, that a new drainfield can go where the old one was, or that a gravity system should be easy. Sometimes that is true, often it is not.

Our approach is simple: gather the right information, explain the constraints clearly, and design the most practical, cost-effective system for the property and the project.

Why Clients Call American Septic Design

Clear communication about what the property can and cannot support
Practical design solutions built around real site conditions
Cost-conscious planning without cutting corners
Support for new construction, replacement systems, remodel-related work, and feasibility questions
Coordination with county and health department requirements

What Our Clients Say

“Tom was great to work with and very responsive. He was helpful throughout the design and installation process, and his follow-up and follow-through helped keep the project on schedule and on budget.”

— Bill G. (Google review)

“When our septic system was failing, Tom was incredibly helpful. He explained the process clearly, walked us through our repair design options, and made a stressful situation much easier to navigate.”

— Nicola C. W. (Google review)

“Knowledgeable and friendly. Tom found a way to get us a gravity system when no one else could.”

— Randy A. (Google review)

“Tom helped us through a difficult, unexpected repair. If you want good communication, Tom defines it.”

— Nan F. (Google review)