Septic Records and Services in Cathlamet, Washington
Cathlamet is in Cowlitz County, Washington. We hold 1 septic records for Cowlitz County, Washington. Of the parcels classified in Cowlitz, 14,939 are on septic — a county figure, not specific to Cathlamet. 2 septic businesses on record with a Cathlamet 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
2
septic businesses here
1
county records held
14,939
county parcels on septic
0%
county docs text-searchable
Providers with a Cathlamet address are on record in more than one county: mostly Cowlitz County, and also Wahkiakum County. Each county's records are held separately; see the county page for the one that matches the property.
Where Cowlitz County, Washington septic records are kept
Cowlitz County, Washington publishes onsite-wastewater records. Records can be searched without an account.
2 businesses we have on record with a Cathlamet address: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
Company
Phone
Rating
Services
James Trott Trucking
(360) 849-4449
—
BOTH
SAM LONGTAIN CONSTRUCTION
(360) 957-0503
—
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 Cathlamet, or just Cowlitz County?
We hold county-level septic and sewer classification, not a per-city breakdown. The figures on this page for Cowlitz County, Washington are county totals, clearly labelled as such, not an estimate for Cathlamet alone.
How many septic companies serve Cathlamet?
2 businesses on record with a Cathlamet 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 Cathlamet kept?
Records for properties in Cathlamet are held by Cowlitz County, Washington.
Figures on this page were last verified 2026-08-31.