Vashon is in King County, Washington. We hold 184,607 septic records for King County, Washington. Of the parcels classified in King, 84,437 are on septic — a county figure, not specific to Vashon. 7 septic businesses on record with a Vashon address, below.
Free septic design for a property here. Generate a code-referenced septic design from the parcel: design flow from bedroom count, tank sizing, soil-driven drainfield area, dispersal method and setbacks. Free to generate and view. Start a design
7
septic businesses here
184,607
county records held
84,437
county parcels on septic
100%
county docs text-searchable
Where King County, Washington septic records are kept
King County, Washington publishes onsite-wastewater records. Records can be searched without an account.
7 businesses we have on record with a Vashon address: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
Company
Phone
Rating
Services
Greentree Dozing
(206) 463-3889
—
oo
Greentree Dozing
(206) 300-7840
—
installer
Lewis Roggenbuck Const LLC
(206) 391-1184
—
installer
Mike's Materials LLC
(206) 463-3457
—
installer
Niece Pumping Service
(206) 463-5969
—
oo
Niece Pumping Service (Romero Island
(206) 463-5969
—
pumper
Potential Energy Inc
(206) 794-9809
—
installer
Before calling any of them, pull the property's recorded as-built if one exists. It gives tank size, lid location and drainfield layout, which is the difference between a quoted job and an hourly dig.
Listing here is not an endorsement. We take no fee from any company on this page, we are not affiliated with them, and being listed does not mean the business is a customer of ours. Fields shown are limited to what we actually hold: no street address, hours or license numbers are shown unless we hold them, and none are invented.
Local septic work: pumping, installation, design, inspection, repair
Pumping. A pumper needs the lid location and tank capacity. Locating a buried lid without the recorded as-built is billed as labor.
Installation. A permit before work starts, an inspection while the system is open, and a final as-built submitted at completion, which is what ends up in the county file.
Design. Design flow from bedroom count, a soil and site evaluation, tank sizing and the required setbacks. On a lot with an existing permit, the original soil work is often already on file.
Inspection. Lenders and many counties require one at sale or transfer. Inspectors start from the recorded as-built; without it they are probing blind.
Repair. Starts from the existing as-built, since the current tank, field and any reserve area constrain what can be rebuilt.
Look up a specific property
Our map shows each parcel as septic, sewer, or unclassified, with the records we hold attached to the parcel.
Is there septic data specific to Vashon, or just King County?
We hold county-level septic and sewer classification, not a per-city breakdown. The figures on this page for King County, Washington are county totals, clearly labelled as such, not an estimate for Vashon alone.
How many septic companies serve Vashon?
7 businesses on record with a Vashon address in our directory: pumping, installation, design, inspection and repair.
Can I get a septic design for free?
Yes. You can generate and view a code-referenced septic design for a parcel at no cost: design flow from bedroom count, tank sizing, soil-driven drainfield area, dispersal method and setbacks.
Where are septic records for Vashon kept?
Records for properties in Vashon are held by King County, Washington.
Figures on this page were last verified 2026-08-31.