Serving Montclair & the Inland Empire
Licensed & Insured Honest. Reliable. Local.
Sweetwater Plumbing 💬 Text us ☎ (909) 312-4516

Backflow protection,
code compliant.

Backflow preventers quietly protect your water from contamination, keeping used water from flowing back into the clean public supply. Most water districts require them on irrigation systems, fire sprinkler systems, and certain commercial properties, and we install, repair, replace, and test them, then file the test results with your water provider for you.

Backflow preventer types

Choosing the right device.

  • Reduced Pressure Zone (RPZ): highest protection, required for high-hazard and many commercial connections
  • Double Check Valve Assembly (DCVA): low-hazard connections; some districts accept it for irrigation
  • Pressure Vacuum Breaker (PVB): irrigation, low-hazard residential
  • Atmospheric Vacuum Breaker (AVB): simplest, used on irrigation anti-siphon valves (hose spigots use a hose-bib vacuum breaker)

Your water district specifies which type is required for your property. We confirm requirements before installation.

Service Area

Serving 24 cities across the Inland Empire.

Chino · Chino Hills · Claremont · Colton · Corona · Diamond Bar · Eastvale · Fontana · Grand Terrace · Highland · La Verne · Loma Linda · Mira Loma · Montclair · Norco · Ontario · Pomona · Rancho Cucamonga · Redlands · Rialto · Riverside · San Bernardino · San Dimas · Upland

What customers say

Real reviews from real customers.

★★★★★4.8 / 5 average
· View all 588+ Google reviews →
MP
Mary Pettitt
★★★★★ Dec 2025
GOOGLE

Sweetwater Plumbing is my go-to place for all my plumbing needs. In fact, I tend to save up plumbing work until something big needs attention. Today, I had three separate jobs. The plumbers were on time, wearing neat and orderly work clothes. They wore…

GH
Gloria Hernandez
★★★★★ May 2026
GOOGLE

Great experience with this Sweetwater plumbing. They were easy to schedule, arrived on time, and quickly fixed the issue. Everything was explained clearly and we're very professional. I highly recommend.

AF
Aaron Foley
★★★★★ Apr 2026
GOOGLE

John and his team have been extremely helpful in alleviating my plumbing issues on two separate occasions now, and I would not hesitate to recommend them.They have been very clear about estimates, scope of work, have arrived promptly at decided start times…

Common Questions

Frequently asked questions.

How much does backflow prevention cost in the Inland Empire?
It depends on the device your water district requires and how it has to be installed. You get your options in writing, each with one flat-rate price, before any work begins, and the price you approve is the price you pay. Our customers tell us our pricing is honest and fair.
Are you licensed for backflow prevention in California?
Yes. Sweetwater Plumbing is a licensed C-36 Plumbing Contractor (California CSLB #889182), fully bonded with $2M general liability insurance. Our backflow testers are certified.
Where do you offer backflow prevention?
We provide backflow prevention throughout the Inland Empire, including Montclair, Ontario, Upland, Rancho Cucamonga, Chino, Chino Hills, Pomona, Claremont, Fontana, Riverside, and 14 other cities. Call (909) 312-4516 to confirm coverage.

Related services

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