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Lake Washington in deep blue with Mount Rainier on the far shore

Lake Forest Park · King County

Backflow testing in Lake Forest Park

Lake Forest Park Water District takes the property-owner side of backflow seriously: the District is responsible up to the meter, and you’re responsible for everything downstream of it. An annual passing test on file is your proof you’ve done your part.

Book a test in Lake Forest Park → (505) 377-4449

LFP Water District program

How Lake Forest Park’s backflow program works

The short version, summarized from the utility’s own cross-connection control materials.

Source: Lake Forest Park Water District · verified October 2026 ↗
01

Assemblies are tested at installation, annually, after a backflow incident and after any repairs, per WAC 246-290-490.

02

Only Washington DOH-certified Backflow Assembly Testers may test.

03

Failed assemblies must be cleaned, repaired or replaced and then pass a retest.

04

Some Lake Forest Park addresses are served by North City Water District instead.

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Report submission

Results are submitted to the District on its Annual Backflow Inspection Report. We complete and submit it for you.

Questions for the utility: office@lfpwd.org · (206) 365-3211

On the ground

What we see in Lake Forest Park

Every city’s housing stock and commercial mix shapes what’s in the meter box.

Hillside irrigation

Steep wooded lots mean irrigation assemblies tucked into slopes and retaining walls. A PVB has to sit 12 inches above the highest head it serves — on a hillside, that’s worth checking.

Services in Lake Forest Park

Neighborhoods

Serving all of Lake Forest Park

  • Town Center
  • Sheridan Beach
  • Horizon View
  • Brookside
  • Lyon Creek
  • McAleer Creek
  • Ballinger Way corridor

FAQ

Lake Forest Park backflow questions

01 Who can test my backflow assembly in Lake Forest Park?
Only a Backflow Assembly Tester certified by the Washington State Department of Health. LFP Water District also needs the tester’s current certification and test-kit calibration on file before it will accept a report — we keep ours current.
02 How do backflow test reports get submitted to LFP Water District?
Results are submitted to the District on its Annual Backflow Inspection Report. We complete and submit it for you.
03 How much does backflow testing cost in Lake Forest Park?
Residential tests start at $95 for the first assembly and $60 for each additional assembly on the same visit. Commercial assemblies start at $115 and fire-line assemblies at $145. Filing with LFP Water District is included.
04 What if my assembly fails in Lake Forest Park?
We show you the reading, quote the repair, and in most cases rebuild and retest on the same visit. The passing retest is what gets filed with LFP Water District.

Nearby

Backflow testing in Shoreline → Backflow testing in Kenmore → Backflow testing in Seattle →

Field test report · next due

Lake Forest Park test due? We’ll handle it.

Book online in two minutes. We test, repair if needed, and file the report with your water utility — and remind you next year.

Book a test → (505) 377-4449
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