Plumbing contractors in Black Diamond, WA
7 active plumbing contractors are registered with Washington L&I at a Black Diamond, WA address. 11 registrations are on record in all, including expired and other statuses.
By the numbers
- Active registrations
- 7
- Registrations on record, all statuses
- 11
- Registered in the last 12 months
- 2
- Median years registered, active
- 4
- Suspension on record
- 1
- Complaint records matched
- 0
- Counts of L&I contractor registration records, computed October 8, 2026. Active means the state's record shows ACTIVE status. Years are counted from each registration's effective date.
- Suspension on record: registrations with SUSPENDED status, plus active or re-licensed registrations that carry a suspension date.
- Complaint records matched: contractors with at least one Attorney General consumer complaint record under the same business name and city. A complaint record is not a finding of wrongdoing.
- Sources: L&I Contractor License Data - General andAttorney General Consumer Complaints. Seehow directory numbers are computed.
Longest registered
- REDLINE MECHANICALRegistered since July 8, 2021
- DCI PLUMBING INCRegistered since September 8, 2021
- PLUMB FIT INCRegistered since March 21, 2022
- DIAMOND PLUMBING INCRegistered since May 9, 2022
- MILES PLUMBING LLCRegistered since June 2, 2025
Recently registered
- WAXMAN FAMILY PLUMBINGRegistered on September 15, 2026
- PNW PIPE WORKSRegistered on December 4, 2025
- MILES PLUMBING LLCRegistered on June 2, 2025
- DIAMOND PLUMBING INCRegistered on May 9, 2022
- PLUMB FIT INCRegistered on March 21, 2022
Active registrations, by the effective date on the state's record.
7 active registrations
Businesses by registered name and license number. Show all 11 registrations on record, including expired.
- DCI PLUMBING INCACTIVE
License DCIPLPI799NU · Registered 5 years
- DIAMOND PLUMBING INCACTIVE
License DIAMOPI795NQ · Registered 4 years
- MILES PLUMBING LLCACTIVE
License MILESPL7523B · Registered 1 year
- PLUMB FIT INCACTIVE
License PLUMBFI796OA · Registered 4 years
- PNW PIPE WORKSACTIVE
License PNWPIPW755Q6 · Registered less than 1 year
- REDLINE MECHANICALACTIVE
License REDLIM*790MK · Registered 5 years
- WAXMAN FAMILY PLUMBINGACTIVE
License WAXMAFP749OH · Registered less than 1 year