WaterOne (Johnson County, Kansas) Backflow Testing: Rules and...

Who must test

These connections require a backflow prevention assembly (BPA). Single-family residential customers are not listed on this commercial page. Source.
Applies to the assemblies above. Source.

Notices and deadlines

Each assembly gets a notification number and an assigned due date. Source.
Open assemblies are listed on the Open Backflow Notifications page. Source.
Testers need the number from the notice or the notifications list. Source.

How the report is filed

Form at forms.waterone.org (Backflow Assembly Test Form). Not a third-party portal. Source.
FAQ document (PDF) for the online form. Source.
New, removed or replaced assemblies use a PDF form that may be emailed to the Department of Water Quality. Source.

Tester registration

Required field in the Backflow Assembly Test Form user guide (modified 02/02/2023). Source.

Approved testers

List includes testers in KS, MO and other states. Source.

If a test is missed

WaterOne may suspend water to a premise that poses a health risk. Source.

Program

Program page with installation, annual testing, online reporting and approved tester list links. Source.

Also

WaterOne serves the Johnson County, Kansas area. Source.

How to file your backflow test with WaterOne

Read your notice. Each assembly gets a notification number and an assigned due date.Source.
Book a tester WaterOne accepts. See finding a tester below; book early so there is time to repair a failed assembly.
The tester tests the assembly and fills in the test report. A failed assembly is repaired and tested again.
The report is filed. Form at forms.waterone.org (Backflow Assembly Test Form). Not a third-party portal.Source.
Keep a copy and set a reminder for next year. Set a free test-due reminder.

Finding a tester WaterOne accepts

WaterOne publishes its own list of approved testers, and we load it. The 232 companies from it carry a "Utility-Approved Tester" badge on their cards here. See the utility's list.

Before you book, ask the tester:

Are you registered with WaterOne, and on its current list?
Will you send the test report to the utility for me, and how?
When is my report due? The date is on your notice; the tester needs time to test, repair if needed and file.

Other water utilities in Kansas

Read October 6, 2026. Program page: waterone.org.

Backflow testers near Lenexa

What the badges mean

✓ KS Certified Backflow Tester Verified: A state roster lists at least one certified tester at this business, with a current certificate. The state sets the exam and renewal.
✓ KS Utility-Approved Tester Verified On the city list: The company is on a water utility's own approved list (the second badge names the list). That is the utility's approval, not a state license, and it counts for that utility.
3 certified testers: How many certified testers the roster lists at this business.
★ 4.8 (25 reviews): The Google rating, shown as Google reports it. It does not change the order.

Order is by our quality score, never by payment. How we verify listings.