Welcome to Napa Valley Backflow Testing & Repair


Napa Valley Backflow is not accepting new test requests for the year 2024.
Please try again in 2025



We are now excepting electronic payments through venmo icon
Find us at nvbackflow.
Get Venmo from The Google Play Store or Apple App Store
Google Play Store Link for Venmo Google Play Store Link for Venmo



Now Serving Yountville!

Napa Valley Backflow Testing & Repair provides testing, repair and installation services for all types of backflow preventers in Napa, Yountville, Saint Helena and American Canyon. We pride ourselves on our excellent service, knowledgable technicians, low pricing and prompt service. We are A+ certified with the Better Business Bureau and are proud to serve the beautiful Napa Valley.

Napa Valley Backflow, LLC BBB Business Review

AWWA License: #14456

AWWA License: #16720


Napa Valley Backflow Testing & Repair Provides:


  • Friendly office support
  • Easy test request system
  • Fast, efficient testing to minimize downtime
  • Friendly, knowledgeable technicians
  • Fast response to breaks and leaks
  • We file all the paperwork
  • We work closely with the city water departments
  • We offer yearly testing cycles
  • We minimize all actions needed by customer



Quick FAQ's

What exactly is backflow anyway?

Backflow is the undesirable reversal of water in a customers water system back into the city water supply. Once the water passes through your meter, the city doesn't want it back.

What's a backflow preventer?

A backflow preventer is a mechanical device, containing check valves that close when the pressure in the city water supply drops, thus preventing the reversal of water.

Why do I need an annual test?

The state of California, per Title 17, requires an annual test of all backflow preventers by an A.W.W.A certified tester. Any structure built after 1987 must have a backflow preventer.


Our Services

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Backflow Testing

We test all sizes, types and locations of backflow preventers. From 1/2" to 10" monsters, we get them all certified in Napa, Yountville, Saint Helena and American Canyon.

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Backflow Repairs

We provide repairs on all types of backflow preventers at very affordable rates. Compare our estimates with other companies and see.

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Backflow Installs

If you need a residential or commercial backflow preventer replaced call us today to get a quote. We urge you to compare our pricing to others.



How To Pay

credit card payments

We accept all major credit cards, personal checks and Venmo. We do not process credit/debit cards on our website. If you would like to pay via credit/debit card you can call our office and we will process it over the phone. We do not keep card information after payment. Under normal circumstances, if you are on our yearly cycle, we leave a self-addressed envelope containing your personal copy of your test report and an invoice for you to mail back with your check.


Paperless Options


Venmo payment
Venmo is an app for smart phones and computers that provides a secure payment system similar to PayPal. You can downlowd and install Venmo from the Google Play Store for Android devices or Apple App Store for iOS devices. Here are the links:

Once you have Venmo setup you can make payments to our account nvbackflow


Quickbooks payment
If we have your email on file we can email you your Intuit Quickbooks invoice directly from Napa Valley Backflow. This is an excellent way to pay to quickly and securely. Any debit/credit card transactions are completed on Intuits's secure payment platform.