Skip to main content
24/7 Emergency DispatchCALL NOW (310) 808-7343
Mainline Plumbing
Backflow Testing & Repair.

Expert Plumbing Services

Backflow Testing & Repair.

Property-Friendly Plumber™|18+ Years Experience
Property-Friendly Plumber™

Schedule This Service

Fast, certified technicians dispatched to your location.

Emergency / Standard

or reach us directly

(310) 808-7343

Your information is secure and never shared

About This Service

Backflow assembly installation, repair and replacement, with the California-required annual test done by a certified backflow tester on the job.

Backflow prevention assemblies stop contaminated water from flowing backward into the public supply. California requires annual testing on every reduced-pressure (RP), double-check (DC), and pressure-vacuum-breaker (PVB) assembly — typically on irrigation systems, fire sprinkler lines, commercial properties, and any cross-connection between potable and non-potable water.

Mainline installs, repairs and replaces backflow assemblies, and we bring a certified backflow tester on the job to verify the device. The tester runs the annual test, tags the assembly and files the report with your water supplier — Cal Water, Golden State Water, LADWP, Long Beach Water or your city's department. If the device fails, our crew repairs or replaces it and it's retested before the report goes in.

Most South Bay assemblies needing annual testing are on commercial properties, irrigation systems for larger residential lots, and properties with a fire sprinkler system. Water suppliers send notices before the deadline but can issue fines or shut off service when a test lapses, so don't let the notice sit.

The Property-Friendly Difference: 18+ Years of Subterranean Infrastructure Mastery in the South Bay. Fully Licensed, Bonded, Insured, and Factory-Certified.

0
Tester on Every Job
0
Or Replace Failed Devices
0
With Your Water Supplier

Step by Step

How It Works

1

Schedule before the deadline

Annual testing is due 12 months from the prior test. Call when your water supplier's notice arrives, not after it lapses.

2

Certified test on the job

A certified backflow tester checks both check valves, relief valve operation (RP only) and the pressure differential, then tags the device.

3

Repair if it fails

Most failures are worn rubber parts covered by a manufacturer rebuild kit. Our crew repairs or replaces the assembly, and it's retested.

4

Report filed

The certified tester files the signed report with your water supplier. You get a copy for your records.

The Difference

Traditional vs. Property-Friendly

Traditional Method
  • Destructive excavation of your property
  • Days or weeks of disruption
  • Expensive landscape restoration
  • Mess and debris left behind
Property-Friendly Method
  • Minimal to no excavation needed
  • Completed in hours, not days
  • Your landscaping stays intact
  • Clean, professional worksite

Where We Serve

Backflow Testing & Repair in the South Bay

We provide backflow testing & repair services across the South Bay of Los Angeles and surrounding communities.

Torrance
Redondo Beach
Hermosa Beach
Manhattan Beach
El Segundo
Hawthorne
Gardena
Carson
Lomita
Rolling Hills Estates
Palos Verdes
San Pedro
Lawndale
Inglewood
Culver City
Long Beach

Common Questions

Frequently Asked Questions

SERVICE AREA

Backflow Testing & Repair Across the South Bay

We provide backflow testing & repair to every neighborhood in these South Bay cities.

Ready to Get Started?

Our Property-Friendly technicians specialize in backflow testing & repair. Call now or dispatch online.