Commercial Backflow Prevention Testing in San Antonio

Backflow preventers protect the public water supply by stopping stagnant water in your fire sprinkler system from flowing backward into drinking water lines. In San Antonio, annual testing is required by both the Texas Commission on Environmental Quality (TCEQ) and local water authorities. Fire Protection Pro connects you with certified testers serving Downtown San Antonio, The Pearl, Stone Oak, Alamo Heights.

How Backflow Testing Works

• Differential pressure test. The tester connects gauges to test ports on the backflow preventer and measures pressure differentials across each check valve. Both check valves must hold within specified tolerances.
• Forward flow test. Verifies the assembly allows proper water flow to the fire sprinkler system under operating conditions.
• Relief valve test (RPZ assemblies). Confirms the relief valve opens at the correct differential to discharge water rather than allow backflow.

Annual Certification Requirements

Texas requires annual testing of all backflow prevention assemblies on fire sprinkler systems. Test reports must be submitted to your local water authority, typically within 10 days of testing. Failed assemblies must be repaired and retested before certification. Missing your annual test can result in fines, violation notices, or water service disconnection. For a step-by-step breakdown of failed and passing outcomes, review our backflow failure response guide.

What Happens If Your Assembly Fails

A failed test means one or more components are not holding pressure within spec. Common causes include worn check valve seats, debris in the assembly, or a stuck relief valve. Most failures are repairable on-site during the same visit. After repair, the assembly is retested and certified. Call (512) 846-6499 to schedule your annual backflow test in San Antonio.