Backflow

The Commercial Plan Review Program reviews the plans for constructing or remodeling a commercial project that includes backflow assemblies and devices.

Backflow assemblies are selected and installed based upon a potential hazard. 

The following backflow protection may be found on a commercial project:

  • Air gap
    • A vertical separation between a faucet and a sink...or a drain pipe and a floor sink.
    • At least 1-inch, or twice the pipe diameter, whichever is bigger.
    • Required for:
      • Ice Machines + Ice Boxes;
      • Walk-in Cooler + Refrigerators + Freezers;
      • Three Compartment Sinks;
      • Food Prep Sinks;
      • Bar Sink + Fountain Sink;
      • Sterilizing Equipment;
      • Commercial Dishwasher + Warewashing Machine;
      • Condensate;
      • Egg Boilers + Steam Tables;
      • Beverage Dispensers = hot + cold + coffee;

epa-air-gap.jpg

  • Atmospheric Vacuum Breaker (AVB)
    • An AVB must be installed at least 6-inches above the highest outlet in a plumbing system AND no shutoff valves may be installed after the AVB.
    • AVB's are commonly found on a faucet for a mop sink.
    • --- Food Establishments ---
      • Do not install a y-valve, or splitter, on a mop sink faucet with an AVB.
      • Do not install a nozzle on a hose attached to a mop sink faucet with an AVB.
  • Pressure Vacuum Breaker (PVB)
    • A PVB must be installed at least 12-inches above the highest outlet in the plumbing system.
    • --- Food Establishments ---
      • Use this product if you want to install a y-valve / splitter on a mop sink faucet.
      • Use this product is you want to install a nozzle on a hose attached to a mop sink faucet with an AVB.
  • Double Check Valve Assembly (DCVA) with vent [ASSE 1022]
    • Must be installed before a carbonator.
    • Must be installed at least 12-inches above the floor.
  • Reduced Pressure Principle Assembly (RPPA)
    • Must be installed before a carbonator.
    • Must be installed at least 12-inches above the floor.

Additional information about backflow:

Here's how to contact the Commercial Plan Review Program:

Health front desk - 775-328-2434

Nick Florey, REHS - Commercial Plan Review Program Manager
775-328-2648
nflorey@washoecounty.us

General email
ehsplanreview@washoecounty.us

HealthEHS@washoecounty.us