Septic Systems

Contact Steve Humphreys

(503) 710-0960


Street Address:
13014 Clackamas River Dr
Oregon City, OR 97045

Septic system installation has been part of our business since Carl Coffman founded Coffman Excavation in 1979. Over the past 30-plus years, we have gained a reservoir of knowledge and stayed up to date with the latest in system technology.

Steve Humphreys manages our septic systems projects. He began installing septic systems in 1990 and has built more than 1,500, from simple residential tank replacement to 40,000 gl. per day commercial systems. He prides himself with the ability to meet with owners at the beginning stages of development and consult with them from the soils/site evaluation through installation.

Our septic systems services include:

  • Septic system design
  • Septic system construction
  • Septic tank repair
  • Septic tank replacement
  • Septic tank upgrades

Please call Steve at (503) 710-0960 to find out more about our septic system installation service.

As a master builder, building extraordinary homes for my clients, I depend upon the expertise of my subcontractors. Coffman Excavation has proven over the 15 years that I have worked with them to be professional, trustworthy and dependable. I have found that Coffman’s ability to research and the fact that they are well regarded with the county building officials have been beneficial to my company. I would highly recommend Coffman Excavation and consider Coffman Excavation to be a significant member of my team.”
Bill Winkenbach, President, BC Custom Homes Corp, Award Winning Street of Dreams Master Builder

“We have worked with the Coffman Excavation team on many of our larger on-site wastewater treatment systems projects. We can recommend them to any of our clients without hesitation, and always include them on our invitation to bid lists. We find Coffman’s pricing competitive, their installations quick, well built, accurate to our designs, and with excellent communication and follow up from the preconstruction meeting through system start-up to site clean-up and finish work. […] They definitely make our designs look as good on the ground as they do on paper.”
Robert F. Sweeney, President, Environmental Management Systems, Inc.

“Steve Humphreys of Coffman Excavation has worked with our firm for many years. He offers exceptional knowledge, follow-up, and customer service. His extensive experience has been a valuable asset to our team of professionals on many occasions. He explains thoroughly the options to our clients, and helps them to understand the most efficient system options available. I highly recommend Steve Humphreys.”
Tom Buckingham, Buckingham Resources LTD.