Built from public records. No company paid to be listed. Every check names its source and the date it was read.
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Septic companies in King County, Washington

69 septic companies on record across King County, built from public data.

Companies
69
Cities covered
25

Septic Permits in King County

Public Health - Seattle & King County, Environmental Health Services opens in a new tab

Washington decides which agency you deal with by the size of the system, and a house is always at the small end. Your local health jurisdiction permits it and certifies the people who work on it. The state Department of Health only takes over further up the scale.

See who regulates septic systems in Washington

Every company on record in King County

Ordered by verification score. The score counts records rather than workmanship, and the license line says which of three things is true: verified against the roster, checked and not found on it, or not yet checked at all.

The license check in Washington

Washington publishes a roster we can check a company against, and we have not run it against these 69 companies yet, so every license on this page currently reads as unverified. That is our backlog and not their standing.

Cities in King County

How these are ranked

By verification score, out of 100, across six checks published in full on how we rank. No company paid to appear and none can pay to rank higher. The score counts records and is not a judgment about workmanship.