Taking on a new septic design project is a bid deal.
We are grateful you found us.


For over 50 years the McNair family has been designing septic systems in Washington State. In 1972, Scott McNair began working for the Clark County Health Department. He left that position a few years later to begin his own on-site septic design company. Scott continued designing systems for the next 30 years.

In 2005, Scott’s son, Cory began working with him. Cory graduated from Northern Arizona University. After several years managing a restaurant, then a bank he was ready for a change. Working with family was a great privilege and one that was not taken for granted. They were able to enjoy several great years working together before Scott lost his battle with cancer.


We will tell you why we are doing what we are doing and share our knowledge with you. Complete honesty is always our goal. If you are not satisfied, let us know and we’ll do our best to correct the problem.

  1. Quality

We are sure you get the quality thing a lot. It is not just the quality of the design, but the quality of the entire experience. Even the smallest projects are held at a high standard of service for us.

  1. Communication

Once we get started we will provide you with a timeline for your project as well as keep you updated if we run into any speed bumps along the way.

  1. Design with you in mind

Every system and situation is different. We promise to look at the details of how your system will be used, and offer our best and most cost effective recommendations to you.

  1. Flexibility

We are not set in our ways and we are happy to adapt to the needs of our clients under the county and state regulations.