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Septic Professionals List
septic system construction
Cowlitz County licenses three types of septic (OSS) professionals installers, operation and maintenance providers, and septic tank pumpers. we also keep a list of septic design professionals that regularly do work in our County.

Click on the link to go to the list:

OSS Design Professional list

OSS Installer list

OSS Operation and Maintenance Provider list

OSS Pumper List

Contact Us
Environmental Health Unit
For questions concerning septic systems:

207 4th Ave. N.
Kelso, WA 98626

Ph: 360-414-5599
Fx: 360-425-7531

711 or 800-833-6384
Washington Relay

Monday - Thursday
7:30 a.m. - 5:30 p.m.
Closed from 12 to 1 for lunch


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