Click here to learn more about septic system permitting resources, applications for new on-site septic systems and repairs, time of transfer information, and frequently asked questions.

Information regarding homeowner maintenance & requirements. Not all systems within Thurston County require an Operational Certificate (OPC), but if you have a septic system on your property, please see the Care & Maintenance section for important information about living on a Septic System.

Environmental Health maintains current lists of septic system professionals certified to perform services in Thurston County. Although we strive to keep these lists current, we recommend you check with your contractor to make sure they are still certified.

Septic Professional, Septic Vendors, Thurston County List of Septic Professionals. Information geared to people wanting to be certified in Thurston County to operate as a septic designer, installer, monitoring specialist or pumper.

Septic Systems in Thurston County are required to go through the Time of Transfer process when selling a home. The Time of Transfer process requires the septic system to be pumped and inspected by a Thurston County certified septic system professional prior to application submittal

Frequently Asked Questions about septic systems, time of transfer, maintenance & care, and more.