Newcastle · King County
Backflow testing in Newcastle — Coal Creek Utility District
Coal Creek Utility District serves Newcastle and nearby neighborhoods. It requires tests at installation, after repairs, after a backflow incident, and every year — and it keeps the records that go to the state.
Coal Creek UD program
How Newcastle’s backflow program works
The short version, summarized from the utility’s own cross-connection control materials.
Source: Coal Creek Utility District · verified October 2026 ↗Assemblies are tested upon installation or repair, after a backflow incident, and annually — more often for high-risk sites.
Protection is required for fire sprinklers, irrigation, pools, hot tubs, livestock waterers, fountains, boat lifts and boiler make-up lines, plus most commercial businesses.
The District reports an annual summary to the Washington State Department of Health.
Non-compliance can lead to required corrective action or discontinued water service.
Report submission
Your tester sends a copy of the test record to Coal Creek Utility District — we do it for you the same day.
Questions for the utility: (425) 235-9200
On the ground
What we see in Newcastle
Every city’s housing stock and commercial mix shapes what’s in the meter box.
Golf course & HOA irrigation
Large managed landscapes and HOA common areas often run commercial-size irrigation assemblies. We test them on the HOA’s schedule and report to the board.
Services in Newcastle
Neighborhoods
Serving all of Newcastle
- Lake Boren
- Olympus
- Hazelwood
- China Creek
- Newcastle Commons
- Coal Creek
- May Creek
FAQ
Newcastle backflow questions
01 Who can test my backflow assembly in Newcastle?
02 How do backflow test reports get submitted to Coal Creek UD?
03 How much does backflow testing cost in Newcastle?
04 What if my assembly fails in Newcastle?
Field test report · next due
Newcastle 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.