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Plumbing in Cowlitz County, Washington

Browse 15 verified plumbing registered across Cowlitz County, Washington (including Longview, Kelso, Kalama, Castle Rock). Every record is compiled from Washington State Department of Labor & Industries (WA L&I) public credential files under Revised Code of Washington RCW 18.27 (Contractor Registration), RCW 19.28 (Electrical EL01–EL06), and RCW 18.106 (Plumbing PL01/PL02).

Official State Authority: Washington State Department of Labor & Industries (WA L&I) Official Registry · County Seat: Kelso

Municipalities in Cowlitz County (2)

Select a city or town in Cowlitz County to view local permit guidance and registered plumbing records:

Longview 9Kelso 3

15 plumbing records · Cowlitz County, WA

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Public Directory Quality: Official WA L&I license records across Cowlitz County · Zero sponsored order · Never sold as a lead · How our data works →

Plumbing directory — Cowlitz County

15 matching records across 2 open municipalities · 15 on this page · Contactable records first, then alphabetical.

Sessions Plumbing/Heating, Inc

Official license file Contactable General contracting · Washington State Department of Labor & Industries · Specialty scope: Plumbing & Heating · Additional recorded trades: Plumbing, Heating & cooling

Registered address: 945 Vandercook Way

SESSII*213NH · Source dated 2026-10-25 · Service area not confirmed. · Verify on Washington portal →

+2 more registrations for this business
Call (360) 636-0070
Prepare brief

Before the first call

  • Describe the job and ask whether it is within their scope and service area.
  • Check the credential with its issuing authority and ask what applies where the work will happen.
  • Ask about insurance, availability, who will do the work, and a written scope.
  • Ask about callout fees, labor or fixed rates, materials, cancellation and any estimate charge.
Prepare a project brief

Verification Overview & Key Takeaways: How to Check Official Credentials

HomeCrafto displays source records with different scopes, including licenses, registrations, municipal permits and community records. A source entry is not proof of qualification for your job. Before signing a work order or paying a deposit, homeowners should confirm that the contractor’s credential number is active, verify that the license classification covers the specific trade scope required for the job, and request a current Certificate of Insurance (COI) directly from the issuing insurance carrier. Independent verification protects your property and ensures compliance with local building codes.

How do you verify a contractor license number and insurance on official portals (FAQ)?

You can verify active license standing and consumer protection rules directly through official government portals, including Washington L&I Contractor Verify, the California Contractors State License Board (CSLB), the Connecticut eLicense Portal, USA.gov State Consumer Protection Offices, and FTC Home Improvement Consumer Guidance. Always confirm municipal permit requirements with your local building department before work begins.