“Protect Your Water Supply with Backflow Inspections”
WSSC backflow testing is essential for ensuring the safety and quality of the public water supply throughout Maryland and Washington D.C. Backflow occurs when water flows in the opposite direction it is intended to, potentially contaminating the water supply with harmful substances. That’s why it’s crucial for commercial, industrial, and multi-family properties to have backflow prevention assemblies installed and tested annually.
At Durance Plumbing, we offer comprehensive backflow inspection services in Anne Arundel County, WSSC, and Washington D.C. Our certified technicians use state-of-the-art equipment and techniques to perform accurate and reliable backflow tests. Whether you’re a business owner or a property manager, our backflow inspections will help you stay in compliance with local regulations and protect your water supply from potential contamination.
Don’t wait – schedule your backflow inspection with Durance Plumbing today and enjoy peace of mind knowing your water supply is protected!
What Is Backflow and Why Does It Happen?
Backflow is the unwanted reversal of water flow in a plumbing system, which can pull non-potable water, chemicals, or other contaminants back into the clean municipal water supply. This typically happens due to two conditions: back-pressure, where downstream pressure exceeds the supply pressure, and back-siphonage, where a drop in supply pressure creates a vacuum that pulls water backward. Irrigation systems, boilers, fire suppression lines, and commercial equipment connected to the water supply are all common sources of cross-connections that can introduce contamination if not properly protected.
Why Annual Backflow Testing Is Required by Law
WSSC Water, Anne Arundel County, and DC Water all require backflow prevention assemblies to be tested annually by a certified technician as part of their cross-connection control programs. Property owners who skip required testing risk fines, water service interruptions, and legal liability if contamination occurs. Staying current on WSSC backflow testing and compliance isn’t just good practice, it’s a legal obligation for most commercial, industrial, and multi-family properties in the region.
Who Needs Backflow Prevention Testing?
Backflow testing is typically required for commercial buildings, industrial facilities, multi-family apartment or condo complexes, restaurants, medical and dental offices, properties with fire sprinkler systems, and any building with irrigation systems connected to the potable water supply. If your property has a backflow prevention assembly such as a reduced pressure zone (RPZ) valve, double check valve, or pressure vacuum breaker, it almost certainly needs to be tested every year.
What Happens During a Backflow Inspection?
During a backflow inspection, our certified technicians connect calibrated test equipment to your backflow prevention assembly to verify that internal check valves and relief valves are holding pressure correctly and preventing reverse flow. We test each component of the assembly, document the results on the required compliance forms, and submit the test report directly to WSSC, DC Water, or your local county as needed. If a device fails testing, we can repair or replace it on the spot to keep you in compliance.
What Happens If You Skip Backflow Testing?
Failing to complete annual backflow testing can result in monetary fines, a discontinuation of water service, failed inspections during property sales or refinancing, increased insurance liability, and, in the worst cases, actual contamination of the potable water supply. Staying current protects both your property and the broader public water system.
Frequently Asked Questions
How often is backflow testing required? Most jurisdictions, including WSSC, Anne Arundel County, and DC Water, require testing once every 12 months.
What is an RPZ valve? A reduced pressure zone assembly is a type of backflow preventer commonly required for high-hazard connections like irrigation and fire systems.
Who is qualified to perform backflow testing? Only certified backflow prevention testers using calibrated equipment can perform compliant tests and submit results to your local water authority.
How long does a backflow test take? Most single-assembly tests take under an hour, though larger commercial properties with multiple assemblies may take longer.
Areas We Serve
Durance Plumbing provides backflow testing and compliance services throughout Anne Arundel County, WSSC’s Montgomery and Prince George’s County service areas, and Washington D.C., including Bowie, Gaithersburg, Laurel, Rockville, Silver Spring, and Takoma Park.