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.
All 11 registrations on record
Businesses by registered name and license number. Show only the 7 active registrations.
- 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
- BATH FITTERSUSPENDED
License BATHFF*771K5 · First registered 2023
- DCI PLUMBING INCRE-LICENSED
License DCIPLPI958NR · First registered 2005
- DIAMOND PLUMBING INCEXPIRED
License DIAMOPI010JK · First registered 1999
- SHIRLEY PLUMBING LLCEXPIRED
License SHIRLPL789NB · First registered 2022