Backflow Testing Services in Westminster, California
Finding a reliable backflow testing professional in Westminster, California is essential for maintaining a safe water supply and staying in compliance with local regulations. Our directory lists 21 backflow testing companies serving Westminster and surrounding communities including Stanton, Garden Grove, Cypress.
Whether you need annual backflow testing, RPZ (Reduced Pressure Zone) valve inspection, or cross-connection control services, the providers listed below offer professional testing services for both residential and commercial properties throughout the Westminster area.
Most water authorities in California require annual testing and reporting for all backflow prevention assemblies. A certified backflow tester will inspect your devices, perform the required differential pressure tests, and file compliance reports with your local water authority.
Browse the listings below to compare ratings, read customer reviews, and contact backflow testing professionals near Westminster directly. Use the filters above to narrow results by rating, review count, or specific services like RPZ testing and preventer installation.
Data source: Google Maps. Always verify licensing with your local water authority.
21 listed providers

CAL VALVE INC.
Testing Verified · Anaheim, CA · 7 mi
“Great location right off Anaheim blvd so it’s super convenient. They always have what I need especially when it comes to backflow parts that can be annoying to track down elsewhere. The staff are…”
Read more on Google
Prevent Backflow & Plumbing Inc.
No reviews yet
Testing Verified · Anaheim, CA · 7 mi

Pacific Plumbing of Southern California
Testing Verified · Santa Ana, CA · 8 mi

Pete's Plumbing
No reviews yet
Testing Verified · Signal Hill, CA · 9 mi

Prodigy Plumbing | Long Beach Plumber
Testing Verified · Long Beach, CA · 9 mi

A-1 Performance Rooter & Plumbing
No reviews yet
Testing Verified · Long Beach, CA · 9 mi

J & D Plumbing & Heating Contractors
No reviews yet
Long Beach, CA · 10 mi
Roto-Rooter Plumbing & Water Cleanup
No reviews yet
Long Beach, CA · 10 mi
Cover Your Brass - Backflow Testing and Backflow Cage Manufacturer
Testing Verified · Signal Hill, CA · 10 mi
“Our plumbing company in Orange County Ca needed backflow anti theft cages asap for our customers who had their backflow assemblies stolen. Bill the owner came through for us! The products we…”
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Advance Mechanical Contractors
No reviews yet
Testing Verified · Signal Hill, CA · 10 mi
Atlas Backflow Services - Backflow Testing Los Angeles + Orange County
Testing Verified · Signal Hill, CA · 10 mi



BAVCO - Backflow Repair Parts & Backflow Supply
Long Beach, CA · 13 mi
“I ordered the parts for my PVB backflow preventer and it seem like I just got off the Internet and the parts were at my door it was fast!!!!! Customer service was very good, trust me, I would’ve gave…”
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Spectrum Backflow Testing
No reviews yet
Testing Verified · Irvine, CA · 14 mi

A-A Backflow Testing and Maintenance
Testing Verified · Torrance, CA · 19 mi

All Star Plumbing & Fire Sprinkler Inc
Testing Verified · Lake Forest, CA · 19 mi
Helpful resources
Frequently Asked Questions About Backflow Testing in Westminster
Most jurisdictions in California require backflow testers to hold a current certification from an approved training program, typically involving classroom instruction, a hands-on practical exam, and continuing education credits. Some municipalities maintain their own approved-tester lists. Always verify certification before hiring.
Residential tests typically involve a single PVB or DCVA device and are quicker to complete. Commercial properties in Westminster often have multiple assemblies, RPZ devices, and fire-line backflow preventers that require more time and specialized equipment. Pricing and scheduling may differ for each type.
Many certified backflow testers in Westminster will file test reports directly with your local water authority or municipality on your behalf. Confirm this with your provider before scheduling. Some jurisdictions require the property owner to submit reports, while others accept direct submissions from the tester.
Backflow testing in Westminster, California typically costs between $50 and $200 per device, depending on the type of backflow preventer and the complexity of the installation. RPZ assemblies generally cost more to test than double check valve assemblies. Contact providers listed above for current pricing in the Westminster area.
If a backflow preventer fails its annual test, the certified tester will diagnose the issue — often a worn check valve, damaged disc, or fouled relief valve. Most testers in Westminster can repair the device on site and re-test it the same day. Your water authority may require the passing report within a set deadline.
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