Backflow Testing and Certification in Hanford

Certified Backflow Prevention Testing & Certification in Hanford

Commercial facilities, irrigation systems, and multifamily properties connected to the City of Hanford water distribution network must install and maintain certified backflow prevention assemblies. Our ASSE-certified backflow testers conduct annual differential pressure decay tests on Reduced Pressure Zone (RPZ), Double Check Valve (DCVA), and Pressure Vacuum Breaker (PVB) devices. We ensure your cross-connection controls prevent contaminated industrial or agricultural water from siphoning back into the municipal drinking supply, filing official compliance documents directly with the City of Hanford Public Works Department.

Certified Backflow Procedures

Specialized Field Protocol

State-Certified RPZ Backflow Testing Protocol

• High-precision five-valve differential pressure test gauge hookup
• Testing relief valve opening point (minimum 2.0 psid safety threshold)
• Direct filing of certification compliance forms with local water authorities

How We Complete Your Service

1. Assembly Identification & Inspection: We record device serial numbers, verify clearance standards, inspect shutoff valves for corrosion, and check relief valve ports for active leakage.
2. Calibrated Differential Pressure Test: Using a certified multi-valve test kit, our technician measures the differential pressure drop across check valves to confirm they seal tightly against backpressure.
3. Immediate Component Rebuild (If Required): If a rubber disc, spring, or relief valve diaphragm fails specifications, we rebuild the internal assembly on the spot with factory-certified parts.
4. Official City Certification Filing: Once passing values are achieved, we apply the municipal inspection tag and submit the official compliance test report to the City of Hanford.