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 EH_Tech@co.thurston.wa.us.