Backflow Testing, AWWA Certified Backflow Prevention Testers
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Backflow prevention Devices
Napa Valley, Napa, County, San Francisco North Bay, Ca. USA

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A backflow prevention device is used to protect water supplies from contamination or pollution. Many types of backflow prevention devices also have test cocks so that they can be tested or examined to ensure that they are functioning properly.

In the United States, the Environmental Protection Agency (EPA) holds local water suppliers responsible for maintaining a certain amount of purity in potable water systems. Many states and/or local municipalities require annual testing of backflow prevention assemblies. A check valve is a common form of backflow prevention.

Backflow prevention protects the potable water system from minor, moderate, and severe hazards. There are over 10,000 reported cases of backflow contamination each year. Some cases can be fatal. Backflow devices are required by law where needed and must be installed in accordance with plumbing or building codes. A backflow assembly has test cocks and shut-off valves and must be tested each year, if relocated or repaired, and when installed.

The simplest, and most effective way to provide backflow prevention is to provide an air gap. An air gap is simply a space between any device that opens to a plumbing system (like a valve or faucet) and any place where water can collect or pool.


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This Symbol:  **   -- Indicates AWWA Certified Backflow Prevention Testers approved by Napa City for 2011.

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Ken Johns Plumbing
1041 Robinson Ln, Napa, CA 94558 707 252-3582

**Tom Hill's Backflow Service, (Cross Connection Specialist)
707 257-8840


**AAA Backflow Prevention Services, Sean Hean, 877 226-3569

**Aaron Plumbing, Robert Amos, 707 255-1447

**Budget Backflow, Peter Cook, 707 712-0706

**Brunson Plumbing, Stephen Demille
978 Kaiser Rd, Napa, CA 94558    707 224-3355

**Cagwin & Dorward, Paul Schultz, 415 892-7710

D & D Plumbing Jack Wilcox  707-451-8911

**Independent Testing Service, Kevin Tedrick, 707-636-4487

**Inspection Services & Fire Protection, Eric Noethig, 707-523-0404

Janal Plumbing Incorporated
68 Coombs St # G1, Napa, CA 94559-3943 707 252-0295

**John's Backflow Tec & Service, John Barber, 707-205-9397

**Ken Johns Plumbing
1041 Robinson Ln, Napa, CA 94558 707 252-3582

**M & O Backflow Testers, Ole Olson, Eric Olson, 707 648-1920

**McLean & Williams, Inc., Gonzalo Salinas
878 El Centro Ave, Napa, CA 94558 707 255-6450

**Mike Morris,  707-974-8042

** Napa Valley Backflow 
Testing & Repairs, 707 224-7497

Oakville Pump Service
Mike Marcucci  707 944-2471

**Perry's Plumbing,  Perry Sylvester,  707-252-2449

Ray Binner Backflows  530 263-3724

**Robertson's Plumbing, Mike Robertson, 707-745-4125

**Roto Rooter, Jerry Bristol   707 224-2433

Tavenner/Northwood Backflow Service  800 750-4547

**Tom Hill's Backflow Service, (Cross Connection Specialist)
707 257-8840

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