To get all the details you need with regard to septic systems and what’s necessary for you to do when selling your home, go to this handy website set up by King County and their Wastewater Management and Public Health Services Dept. There is also a section that will provide details on how to use and care for a septic system as well.
As a seller, you have responsibilities and paperwork that is required. As a buyer, you should be prepared to look for these details during your inspection process.
Agents should be familiar with this process as well, and if you (Mr. or Ms. Agent) aren’t, then you should do a little reading too.
Most septic (aka onsite sewage) systems are found in outlying areas of Puget Sound or in County controlled areas. If you aren’t in King County then you should check with your local county government website or contact the local county office for the info you need for your area.