How do I find information on my septic system?

Thurston County GeoData Center does not have septic location information available in the online map viewers or for download from the Open Data site.

Thurston County Environmental Health maintains a website full of information for Onsite Sewage System (OSS)–including different types of septic systems, commons do’s and don’ts, and permit information.

For additional information, contact the Environmental Health at 360-867-2673 or email