ContractorHistory

Plumbing contractors in Seattle, WA

105 active plumbing contractors are registered with Washington L&I at a Seattle, WA address. 212 registrations are on record in all, including expired and other statuses.

By the numbers

Active registrations
105
Registrations on record, all statuses
212
Registered in the last 12 months
14
Median years registered, active
4
Suspension on record
16
Complaint records matched
5

Longest registered

  1. A Toms Sewer and Drain LLCRegistered since June 5, 2013
  2. SOUND SEWER INSPECTION INC.Registered since September 27, 2016
  3. SJS MECHANICAL SERVICES LLCRegistered since July 19, 2021
  4. O'NEILL PLUMBING CORegistered since July 26, 2021
  5. COLLIER PLUMBER INCRegistered since August 5, 2021

Recently registered

  1. PRECISION PIPE & WELD LLCRegistered on September 25, 2026
  2. NERO PLUMBINGRegistered on September 18, 2026
  3. CASCADE CRAFT PLUMBING LLCRegistered on September 4, 2026
  4. SOREANO PLUMBING SERVICERegistered on July 31, 2026
  5. NIC'S PLUMBING LLCRegistered on July 15, 2026

Active registrations, by the effective date on the state's record.

All 212 registrations on record

Businesses by registered name and license number. Show only the 105 active registrations.