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Backflow Testing Services in South Pasadena, California

Finding a reliable backflow testing professional in South Pasadena, California is essential for maintaining a safe water supply and staying in compliance with local regulations. Our directory lists 15 backflow testing companies serving South Pasadena and surrounding communities including Alhambra, Pasadena, San Gabriel.

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 South Pasadena 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 South Pasadena 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.

15 listed providers

Services:
Hydro Backflow backflow testing
5 mi

Hydro Backflow

5.0(2)

Arcadia, CA · 5 mi

Annual Certification FilingCommercialResidential
Website
Precision Backflow Testing & Repairs backflow testing
Testing Verified
7 mi

Precision Backflow Testing & Repairs

5.0(19)

Testing Verified · La Cañada Flintridge, CA · 7 mi

Backflow TestingPreventer RepairAnnual Certification

Had a great experience with Precision Backflow! I called for information as we were looking for a new backflow testing company-we had a few bad experiences with the company we’d been using. I talked…

Read more on Google
Website
H. L. Moe Co., Inc backflow testing
Testing Verified
7 mi

H. L. Moe Co., Inc

4.8(467)

Testing Verified · Glendale, CA · 7 mi

Backflow TestingCommercialResidential
Website
USC Foundation for Cross-Connection Control and Hydraulic Research backflow testing
8 mi

USC Foundation for Cross-Connection Control and Hydraulic Research

5.0(2)

Los Angeles, CA · 8 mi

Backflow TestingCross-Connection Control
Website
Los Angeles Plumbing & Backflow backflow testing
Testing Verified
9 mi

Los Angeles Plumbing & Backflow

5.0(3)

Testing Verified · Irwindale, CA · 9 mi

Backflow TestingPreventer InstallationPreventer Repair
Website
VB
Testing Verified
10 mi

Valley Backflow

3.0(4)

Testing Verified · Burbank, CA · 10 mi

Called a handful of companies and they were the most responsive at the best price. Service was great and I would use again!

Read more on Google
Website
Plumbquest Plumbing & Backflow testing backflow testing
11 mi

Plumbquest Plumbing & Backflow testing

No reviews yet

Los Angeles, CA · 11 mi

CommercialEmergency ServiceFree Estimates
Website
Hydro Backflow backflow testing
15 mi

Hydro Backflow

5.0(2)

West Covina, CA · 15 mi

Annual Certification FilingCommercialResidential
Website
Mr. Rooter Plumbing of Long Beach backflow testing
16 mi

Mr. Rooter Plumbing of Long Beach

No reviews yet

Long Beach, CA · 16 mi

Emergency Service
Website
American Drain Works and Plumbing Company backflow testing
17 mi

American Drain Works and Plumbing Company

5.0(45)

Los Angeles, CA · 17 mi

Commercial
Website
BAVCO - Backflow Repair Parts & Backflow Supply backflow testing
19 mi

BAVCO - Backflow Repair Parts & Backflow Supply

4.7(26)

Long Beach, CA · 19 mi

Preventer RepairSame-Day Service

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…

Read more on Google
Website
AB
Testing Verified
19 mi

Accurate Backflow Testing

3.9(8)

Testing Verified · Van Nuys, CA · 19 mi

Backflow TestingPreventer InstallationPreventer Repair

This is a vendor partner Branded Group can trust! We've recently given them a few more jobs and they have done superbly well every single time we've given them a work order. They've earned themselves…

Read more on Google
Website
A-1 Performance Rooter & Plumbing backflow testing
Testing Verified
19 mi

A-1 Performance Rooter & Plumbing

No reviews yet

Testing Verified · Long Beach, CA · 19 mi

Emergency Service
Website
Mr Fix It Plumbing backflow testing
Testing Verified
20 mi

Mr Fix It Plumbing

No reviews yet

Testing Verified · Long Beach, CA · 20 mi

Backflow TestingCommercial
Website

Frequently Asked Questions About Backflow Testing in South Pasadena

Many certified backflow testers in South Pasadena 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 South Pasadena, 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 South Pasadena 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 South Pasadena 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.

Cross-connection control prevents contaminated water from flowing backwards into the clean water supply. Backflow prevention devices are installed at cross-connection points to protect public health. Regular testing ensures these devices function properly. Many municipalities in California require cross-connection control programs for commercial properties and irrigation systems.

Many municipalities in California require annual backflow testing for commercial and residential properties with backflow prevention devices. Your local water authority in South Pasadena can confirm the exact testing schedule and deadlines for your area. Failing to test on time may result in fines or water service interruption.

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