WSSC Certified Master Plumber
WSSC Backflow Testing & Compliance
Don’t risk hefty fines or water service interruption. WSSC backflow testing is required when the Washington Suburban Sanitary Commission (WSSC) determines that a property’s plumbing system could allow contaminated water to flow back into the public water supply. If you’ve received a WSSC backflow testing notice, the requirement is regulatory, time‑sensitive, and must be handled by an approved, properly licensed plumber.
Durance Plumbing is a WSSC‑approved provider specializing in backflow testing, repair, replacement, and compliance documentation throughout the WSSC service area.
Protecting Maryland’s Water Supply
WSSC requires annual testing for all commercial properties and select residential systems to ensure clean drinking water for the community.
What is Backflow Testing?
Backflow testing is the process of verifying that a backflow prevention assembly is operating correctly and protecting the potable water supply from contamination. WSSC mandates testing on specific plumbing connections that present a cross‑connection risk, including commercial buildings, medical offices, restaurants, irrigation systems, fire protection systems, and certain multi‑family or mixed‑use properties.
The test itself must be performed using calibrated equipment and documented in accordance with WSSC Cross‑Connection Control Program requirements.
Why WSSC Requires Backflow Testing
WSSC’s cross‑connection control program exists to protect public health. Backflow can occur due to:
- Water main breaks
- Sudden drops in system pressure
- Fire flow events
- Improper plumbing modifications
When these conditions occur, contaminated water can be siphoned back into the public system unless a properly functioning backflow preventer is in place.
Because of this risk, WSSC requires:
- Initial testing after installation
- Periodic testing (typically annually)
- Testing after repair, relocation, or replacement
What Happens If You Receive a WSSC Backflow Notice
A WSSC backflow notice typically means one of the following:
- Your annual backflow test is past due
- A newly installed device must be tested
- A previous test failed and requires correction
- WSSC records show missing or incomplete documentation
The notice will include a compliance deadline. Failure to respond can result in enforcement actions, including warnings, fines, or water service interruption.
WSSC Backflow Compliance & Testing FAQ's
How often does WSSC require backflow testing?
Most WSSC‑regulated backflow prevention assemblies must be tested annually. Some installations may require testing after installation, repair, or relocation.
Who is allowed to perform WSSC backflow testing?
Testing must be performed by a properly licensed and certified backflow technician. Not all plumbers are authorized or qualified to conduct WSSC backflow testing.
What happens if my backflow device fails the test?
If a device fails, WSSC requires corrective action. This may involve repair, rebuilding, or replacement, followed by a passing retest.
Will WSSC shut off my water if I don’t comply?
WSSC can take enforcement action for non‑compliance, which may include notices, penalties, or water service interruption if deadlines are ignored.
Do you submit the test results to WSSC?
We complete the required test documentation and provide guidance on submission. Submission requirements can vary depending on the type of account and device.
How long does a backflow test take?
Most standard backflow tests take 30–60 minutes, depending on device size, condition, and site access.
Do you service failed or older backflow assemblies?
Yes. We regularly repair and rebuild older assemblies when feasible and advise replacement when repairs are no longer reliable or cost‑effective.
Our WSSC Testing Process
Durance Plumbing follows a structure process designed to meet WSSC requirements and minimize disruption.
1. On-site Evaluation
Verify device type, size, condition and accessibility
2. Certified Backflow Test
Perform testing using calibrated equipment
3. Immediate Results
Pass/fail determination provided on site
4. Repair or Recommendations (if needed)
Discuss options if the device fails
5. WSSC Documentation
Complete required test forms and submission guidance
WSSC Service Area
We perform WSSC backflow testing throughout the WSSC service area, including but not limited to:
- Silver Spring
- Takoma Park
- Laurel
- Wheaton
- Bethesda
- Montgomery County
- Prince George’s County
If your property receives water service from WSSC, we can assist with compliance.
Backflow Repairs, Rebuilds, and Replacements
If a backflow assembly fails testing, WSSC requires corrective action. Depending on the condition of the device, this may involve:
- Cleaning and rebuilding internal components
- Replacing test cocks or shutoff valves
- Full replacement of the assembly if parts are unavailable or the body is compromised
We service and repair common WSSC‑regulated assemblies, including reduced pressure zone (RPZ) assemblies and double check valve assemblies.
Schedule WSSC Backflow Testing
If you’ve received a WSSC backflow notice or need scheduled testing, contact Durance Plumbing to arrange certified service and compliance support.
Why Choose Durance Plumbing for WSSC Backflow Testing
- WSSC Master Plumber License
- Extensive experience with WSSC cross‑connection compliance
- Familiarity with WSSC submission and inspection requirements
- Commercial, municipal, and regulated property expertise
- Ability to test, repair, replace, and document compliance
Backflow testing is not general plumbing work. It requires regulatory knowledge, certification, and experience working within WSSC’s program.