Double M Plumbing warns Dallas owners to check backflow test deadlines

Double M Plumbing is urging Dallas property owners to confirm when their backflow prevention assemblies were last tested as irrigation systems hit peak season. The warning matters because missed deadlines can threaten water service and backflow failures can expose the public drinking supply to contaminated water.

Why it matters: - A missed backflow test can affect continued water service for Dallas properties. - Irrigation systems are one of the most common cross-connections between a property and the public drinking water supply. - Summer irrigation increases the risk of back-siphonage and backpressure when demand peaks, mains break and hydrants are drawn down. - Water sitting in irrigation lines can move toward the potable supply if the backflow assembly is not working.

What happened: - Double M Plumbing is urging Dallas homeowners, landlords and commercial property owners to check the date of their last backflow prevention assembly test. - The company tied the reminder to irrigation season, when systems are running at their heaviest load. - Dallas Water Utilities requires annual testing under its Backflow Prevention and Cross-Connection Control Program. - DWU sets the deadline by the anniversary date of the previous test and sends notification letters about 60 days before the due date. - Properties that miss the deadline face escalating enforcement.

The details: - Texas backflow prevention rules fall under Title 30, Chapter 290 of the Texas Administrative Code, administered by the Texas Commission on Environmental Quality. - Sections 290.44 and 290.46 set minimum cross-connection control standards. - Assemblies must be tested when installed, repaired, replaced or relocated. - Assemblies installed to protect against a health hazard must be tested at least annually. - No more than 12 months may pass from the previous test date. - TCEQ requires a licensed tester to check an assembly installed on an irrigation system. - Individual water providers can require additional annual testing. - Texas requires a current Backflow Prevention Assembly Tester license from TCEQ. - That license requires an approved 40-hour course and a state examination. - Testers must use gauges calibrated annually by an approved laboratory. - Reduced pressure principle assemblies, double check valve assemblies, pressure vacuum breakers and spill-resistant vacuum breakers are testable. - Single check valves and atmospheric vacuum breakers are not testable. - An on-site sewage facility raises the hazard classification of an irrigation system. - That higher hazard classification requires a reduced pressure assembly rather than a lesser device. - A customer service inspection is required for all new construction, for existing customers with substantial plumbing modifications, and when there is reason to suspect a hazard or contamination source. - Owners who remodeled, added an irrigation system or bought a property with unclear records are the most likely to be out of compliance without knowing it.

Between the lines: - Dallas property owners may already be in the enforcement window if they rely on a prior notice rather than the actual anniversary date. - The reminder targets a common paperwork gap: owners can have a required test due even when day-to-day plumbing still appears to function normally. - Properties with pools, irrigation additions or sewage facilities can face higher scrutiny because the hazard level changes the required device.

What's next: - Property owners should locate the last test report and confirm the anniversary date. - Owners who cannot find records should schedule an inspection rather than wait for a notice. - Double M Plumbing says owners who recently purchased a property, added irrigation or added a pool fill line should assume an inspection is warranted. - Double M Plumbing provides backflow testing, assembly installation and annual maintenance and can be reached at 214-714-6600.

The bottom line: - In Dallas, backflow testing is a recurring compliance deadline, not a one-time plumbing task.