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Plumbing and gas piping plan review applications are accepted through the online services portal. Applicants who choose to apply by mail must use the plumbing and gas piping permit application forms. See instructions on how to submit online a medical gas plan review and permit application (PDF).

  • Drinking water program
    Regulation small public and individual private water systems to prevent communicable diseases and illnesses.

  • Wastewater program
    Services and regulations to ensure that over 85,000 septic systems including 192 septic systems in Seattle are safe. Septic systems treat wastewater when homes and buildings are not connected to public sewer systems. Also provides educational, advisory and permitting services for owners of septic systems and certifications for several septic professionals.

  • Water recreation program
    Plan review, permits and inspections for public and semi-public pools and spas in King County.

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

Phone: 206-263-9566
Inspection request line:

For Vashon Island residents: Plumbing and gas piping inspections located on Vashon Island are only performed on Wednesdays.

Temporary schedule changes:

  • Due to the Governor's "Stay Home—Stay Healthy" order, the Plumbing and Gas Piping program will limit the business hours for plan review document submittals to every Wednesday morning between the hours of 9 AM to 1 PM. For customers who wish to drop plans during the established day and time; it is required to contact Harpreet Sandhu (Sandy) at: 206-477-8638,, to obtain delivery instructions.

  • Front office closures:
    To reduce person-to-person contact related to COVID-19, the Environmental Health Services Division's in-person counter services at 401 Fifth Avenue in Seattle, WA (Chinook Building) and 14350 SE Eastgate Way in Bellevue, WA (Eastgate Public Health Center) will be suspended through the end of March. See full notice on the Environmental Health homepage.

Permit hours

  • Mon. Wed. Fri: 8:00 am to 3:00 pm
  • Tues. and Thurs: 10:30 am to 3:00 pm
  • Phones are answered until 3:00 pm

Environmental Health Services
14350 SE Eastgate Way
Bellevue, WA 98007

Phone: 206-477-8050
Inspection request line:

Permit hours:

  • Mon. Wed. Fri: 8:00 am to 3:00 pm
  • Tues. and Thurs: 10:30 am to 3:00 pm
  • Phones are answered until 3:00 pm

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2018 Plumbing and Gas Piping Codes adoption delayed

Public Health — Seattle & King County planned to adopt the 2018 edition of the Plumbing and Gas Piping codes to be effective July 1, 2020. However, due to several factors, including the impacts of COVID-19 and Governor Inslee's executive order, the effective date has been delayed to March 15, 2021. Between February 1, 2021 and March 14, 2021, Public Health will accept permit applications using either the 2015 or 2018 codes. As of March 15, 2021, Public Health will only accept permit applications that use the 2018 codes.

COVID-19 Guidance for Legionella and Building Water System Closures

Many buildings are closed to the public or have limited access in order to help slow the spread of COVID-19. To prevent Legionella growth, these systems must be actively managed and maintained. See information and guidance to reduce Legionella growth and other pathogen and corrosion concerns that occur when there is a large drop in building water use.

Plan Review required for plumbing and gas piping installations

The Washington state adopted plumbing code (2015 Uniform Plumbing Code) section 113 requires a permit to be obtained from the Authority Having Jurisdiction prior to each installation, alteration, repair, replacement or remodel. Section 114 sets requirements for a permit application.

Subsection 4 states that a permit application to be "accompanied by plans, diagrams, computations and specifications, equipment schedules and other data as required by the Authority Having Jurisdiction."

Be informed: Not all plumbing and gas piping installations are subject to a plan review. Please open and read the "Plan Review Submittal" information (open Plan Review Information on the left side of this page) to determine if your project requires a plan review.

Please check our website periodically for upcoming updates and changes.