Plumber in Kirkland, WA: side sewers, permits and how to hire

What are Kirkland homes like, plumbing-wise?

Kirkland's housing peaked in the 1970s. Census Bureau survey data for 2020 to 2024 put the median year built at 1984, with about 23 percent of homes built in the 1970s and about 15 percent in the 1960s (ACS table B25034 via Census Reporter). Homes from that era are now 45 to 60 years old, which is when many owners face their first major supply line or side sewer decision.

Who provides sewer service in Kirkland?

Two agencies split the city. According to Kirkland's Wastewater page, Northshore Utility District provides wastewater service to the northern, more recently annexed part of the city, and Kirkland Public Works serves the southern portion. Check your bill to see which one you have. The city system includes 123 miles of sewer mains, over 3,600 maintenance holes, six pump stations and 11,202 private side sewer connections.

Who owns the side sewer?

Kirkland is direct about it: the customer owns and maintains the private side sewer pipe that begins at the public sewer main, and property owners are also responsible for plumbing on private property. The city operates and maintains the public sewer infrastructure, including the mains. In practice that means a break under the street in front of your house can still be your repair bill, so a camera inspection before buying a Kirkland home is worth doing. Our side sewer inspection guide explains what a scope shows.

For the city's records of where your side sewer runs, the Wastewater page points to the Our Kirkland service portal or its Public Works Development and Engineering staff.

What number do you call for a sewer emergency?

The Wastewater page lists a Public Works emergency line staffed every day of the year: 425-587-3900. In the Northshore Utility District area, the district's sewer backups page lists (425) 398-4400 as its 24-hour number for reporting sewer backup emergencies, and says it can help determine whether the problem is in the private plumbing. For leaks inside your home, close the main shut-off valve first and see our emergency guide.

Does Kirkland have lead service lines?

Kirkland's lead and copper page says no lead service lines were discovered within the City of Kirkland water service area. The city identified about 3,300 properties built in 1967 or earlier and physically inspected a subset of about 350; the page notes that King County code banned lead pipes in 1968. A Service Line Material Public Viewer map lets you look up your address. Homes in Finn Hill, Kingsgate and North Juanita may get water from Northshore Utility District or Woodinville Water District instead, so check with your provider.

Where do you get a plumbing permit in Kirkland?

Kirkland issues its own permits; Public Health Seattle and King County only covers Seattle, Clyde Hill and unincorporated King County. The city's mechanical, plumbing, electrical and fire permit page says plumbing permits are required for plumbing equipment or systems and that applications are submitted online through MyBuildingPermit.com. Water heater replacements, repiping and fixture relocations are typical jobs to ask about. If a contractor says a permit is not needed, ask the city to confirm.

How do you check a plumber working in Kirkland?

Under Washington law, anyone you pay to do plumbing must be an L&I-certified plumber and work for a licensed plumbing contractor. King County's hiring guidance adds that contractors must be registered with L&I, post a bond and carry general liability insurance. Search the company in the L&I Verify tool before you sign. Our hiring guide lists the questions to ask, and our cost guide shows typical price ranges.

How can this site help?

This site is an independent homeowner guide operated by SWKM GmbH. We are not a contractor, hold no license and do not perform plumbing work. If you would like help, email us your Kirkland ZIP code, what is happening and a few photos. We reply by email with practical next steps and, where we know a licensed contractor for your area, an introduction. Please run the license checks above on anyone you hire, including anyone we mention.