Backflow prevention testing and certification in Antelope

What our Antelope certified backflow service includes

Backflow assemblies protect the municipal drinking water grid from hazardous cross-contamination. Under California state health mandates, these mechanical safety devices must be tested and certified annually by a licensed, certified technician.

Our complete certified backflow testing and repair includes: - Annual performance testing of RPZ, Double Check (DCVA), and Pressure Vacuum Breaker (PVB) assemblies - Five-valve differential pressure gauge diagnostic testing calibrated to factory tolerances - On-site rebuilding of worn internal rubber check discs, diaphragm seals, and stainless steel springs - Direct digital submittal of certified test reports to the Sacramento Suburban Water District and Sacramento County EMD - Weatherproof laminated inspection tagging affixed directly to the backflow assembly - Above-ground thermal insulation audit and winter freeze-protection recommendations

Testing internal check valve differential pressures using a calibrated five-valve test kit.

What backflow is and why annual testing is mandatory

Backflow is the unwanted reversal of non-potable water, chemicals, or contaminants into the municipal drinking water supply. Under normal conditions, water flows under positive pressure from the water main into a building.

However, if municipal pressure suddenly drops—due to a main water break down the street or heavy fire hydrant draw during an emergency—a vacuum (backsiphonage) can develop. Siphonage can draw contaminated water from commercial cooling towers, industrial chemical processes, or commercial lawn fertilizer injectors back into the drinking water system.

To protect public drinking water, state and local water purveyors mandate that all commercial properties, industrial facilities, and dedicated irrigation services install certified backflow prevention assemblies. Under the California Health and Safety Code and Sacramento County Environmental Management regulations, these assemblies must undergo mandatory certified testing every twelve months.

Testing Reduced Pressure Zone (RPZ) and Double Check assemblies

Different property types require different backflow prevention assemblies based on hazard level:

• Reduced Pressure Zone (RPZ) Assemblies (High Hazard): Used where cross-connections involve health hazards (commercial kitchens, chemical facilities, industrial parks, and dental offices). An RPZ contains two independent spring-loaded check valves separated by a hydraulically operated differential relief valve that vents water to the atmosphere if either check valve fails.
• Double Check Valve Assemblies (DCVA) (Low Hazard): Used where hazards are aesthetic rather than toxic (fire sprinkler systems and commercial landscape irrigation lines without chemical injection). Contains two spring-loaded check valves in series.

Inspecting the differential relief valve on an RPZ assembly engineered for high-hazard cross-connections.

Auditing double-check valve assemblies installed on dedicated irrigation and commercial fire lines.

Our 5-step certified testing and certification protocol

Our technicians are certified backflow prevention testers holding active credentials recognized across Sacramento County, the Sacramento Suburban Water District, and the City of Sacramento Department of Utilities.

Our testing protocol follows exact field standards: 1. Visual & Test Cock Inspection: We inspect the shutoff valves, test cocks, and physical enclosure for leaks, structural damage, or freeze cracking, then briefly flush the test cocks to clear debris. 2. Differential Pressure Gauge Hookup: We attach our calibrated five-valve differential pressure test gauge to the assembly's test cocks using high-pressure flexible hoses. 3. Relief Valve Differential Testing: On RPZ units, we measure the exact PSI opening point of the differential relief valve to confirm it discharges before line pressure drops below safety thresholds. 4. Check Valve Tightness Verification: We test the differential pressure hold across the first check valve (minimum 5.0 PSI for RPZ) and verify the second check valve seals tightly against backpressure. 5. Official Certification & Direct Submittal: Once the assembly passes, we affix a signed, laminated inspection tag to the device and submit the official certified test report directly to your serving water purveyor.

Rebuilding failed backflow assemblies on the same visit

If a backflow assembly fails its annual test—usually due to grit lodging between the rubber check disc and brass seat or a broken internal spring—our technicians carry genuine manufacturer rebuild kits for Febco, Wilkins (Zurn), Watts, and Ames assemblies.

We disassemble the valve body, clean internal chambers, replace rubber check discs, diaphragm gaskets, and springs, reassemble the unit, and re-test it to pass municipal certification on the same visit without requiring a second service call.

Attaching signed, laminated compliance certification tags satisfying Sacramento County regulations.

Winter freeze protection for backflow assemblies

Because backflow assemblies are installed above ground, they are exposed to winter freezing temperatures. Freezing water inside the brass body expands, cracking the expensive casting. Facility managers and property owners should ensure their backflow assemblies are protected with insulated weatherproof enclosure bags or fiberglass hot boxes before winter cold snaps along Dry Creek and Arcade Creek basins.