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Types of Systems
Onsite sewage (septic) systems collect, treat and disperse wastewater.
Above is the most simple - a Conventional Gravity system.
There are many different types of systems that treat and dispose of wastewater. All of them must be approved by the Washington State Department of Health to be permitted in Island County. Below are some resources for the more common systems. If you have additional questions, please feel free to contact us.
Keep in mind that some of these sources reflect differing regulations and requirements for onsite septic systems. Always refer to Island County Code for specific requirements.
Websites with Helpful Information
Thurston County Environmental Health "Septic System Types" Webpage
King County Public Health Wastewater Program "Types of Septic Systems" Webpage
Publications for Print
Understanding and Caring for Your Septic Tank System - WA DOH
Understanding and Caring for Your Pressure Distribution System - WA DOH
Understanding and Caring for Your Sand Filter System – WA DOH
Understanding and Caring for Your Mound System – WA DOH
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