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King County · About 20 min from our base

Backflow Testing in Seattle, WA

State-certified backflow testing, repair and installation for Seattle homes, HOAs and businesses, with your test report filed with your water purveyor for you.

Book a test in Seattle (206) 549-4992
  • WA-certified testers
  • Reports filed for you
  • 24/7 emergency dispatch

We serve homes and businesses throughout Seattle, with the most flexible scheduling in North Seattle neighborhoods like Northgate, Lake City, Greenwood, Ballard and Wedgwood. Seattle Public Utilities mails annual backflow test notices to owners of testable assemblies, and that notice is the reason many of our Seattle customers first call us.

Restaurants, clinics, dental offices, car washes, breweries and multifamily buildings across the city rely on us to test reduced-pressure and double check assemblies, file the results with SPU and fix failures fast.

Backflow services in Seattle

Who is your water purveyor in Seattle?

Your purveyor is the water utility that sends your annual test notice and receives your test report. Depending on your address, Seattle properties are commonly served by Seattle Public Utilities.

Not sure which one is yours? Check the top of your water bill or the test notice itself. Or just give us your address when you book and we'll figure it out and send your report to the right place.

Local know-how

Seattle's dense commercial corridors mean many buildings have several assemblies (domestic, fire, irrigation and process lines), each with its own due date. We consolidate them onto one schedule, test them in one visit where possible and send you a single summary.

Neighborhoods we serve

  • Northgate
  • Lake City
  • Greenwood
  • Ballard
  • Wedgwood
  • Maple Leaf
  • Broadview
  • Bitter Lake
  • Fremont
  • Wallingford
  • Capitol Hill
  • Downtown & SODO

ZIP codes

98103, 98107, 98115, 98117, 98125, 98133, 98177, plus surrounding unincorporated areas.

How backflow testing works in Seattle

  1. Book

    Call or book online. Have your test notice handy if you got one.

  2. We test

    A certified tester checks every valve with a calibrated gauge, usually in under 30 minutes per assembly.

  3. We fix

    If it fails, we explain why and quote the repair. Most repairs can be done on the spot.

  4. We file

    Your passing report goes to your purveyor, and a copy comes to you.

Seattle backflow FAQs

Do you file backflow test reports with Seattle Public Utilities?

Yes. After every test we submit your results to SPU so you don't have to, and you get a copy for your records.

How far into Seattle do you go?

All of Seattle. North Seattle is closest to our Edmonds base, so it usually has the most flexible appointment times, but we test, repair and install assemblies citywide.

My Seattle restaurant's backflow assembly is dripping from the relief valve. Is that an emergency?

A reduced pressure assembly that discharges water from its relief valve is telling you something is wrong, often a fouled or worn check valve. It usually isn't dangerous in the moment, but it wastes water and will fail its next test. Call us and we'll diagnose and repair it.

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