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Public Health - Seattle & King County

Plumbing and Gas Piping program

Office locations in Seattle and Bellevue

Environmental Health Services
401 5th Ave, Suite 1100 [ MAP ]
Seattle, WA 98104

Phone: 206-263-9566
Fax: 206-296-0189
Inspection request line: 206-205-0935

Permit hours:

  • Monday, Wednesday, Thursday, Friday: 8:00 am4:30 pm
  • Tuesday: 9:00 am4:30 pm

Environmental Health Services
14350 SE Eastgate Way [MAP]
Bellevue, WA 98007

Phone: 206-296-4932
Fax: 206-296-9792
Inspection request line: 206-205-0935

Permit hours:

  • Monday, Tuesday, Wednesday & Friday 8:00 am – 4:30 pm
  • Thursday, 9:00 am – 4:30 pm
Download Plumbing and Gas Piping staff directory and King County inspection areas (PDF)

Applications, permits and inspections
Use the Online Services Portal to purchase plumbing and gas piping permits
NEW! Permit status page: View your most recent inspection results for plumbing, gas piping, and backflow
Who can purchase permits and who can do the work?
Which jurisdictions in King County are permits issued?
How do I get a Homeowner's Plumbing Permit?
Downloadable permit applications
Fee schedule for plumbing and gas piping services

Plumbing codes and related information

Significant Code Provisions (PDF; updated May 27, 2014)
This document will be updated periodically to provide important information relating to code provisions and permit or inspection processes. Please refer to "Guidelines and policies for contractors, installers and other interested parties" for additional information.

How do I get a Homeowner's Plumbing Permit?
Where to get a copy of the Code
Guidelines and policies for contractors, installers and interested persons
Installing waste and vent pipes and fittings
Drainage and venting fixture unit values
Installing your new water heater
Domestic dishwasher waste discharge (diagrams)
Installing your new waterline
Water supply fixture units (WSFU) and minimum fixture Branch pipe sizes
Styles of pipe fittings

Gas piping codes and related information
Where to get a copy of the Code
Guidelines and policies for contractors, installers and interested persons
Installing your new water heater
Installing gas piping

Related Public Health programs and services
Drinking water program
Wastewater program (onsite septic systems)
Water recreation program (public and semi-public pools and spas)