What San Diego Homeowners Should Know About Backflow Preventers

Backflow preventers aren’t something most homeowners think about—until there's a problem. But in cities like San Diego, where protecting the public water supply is a big deal, it’s important to understand your responsibilities when it comes to backflow compliance.

Why Backflow Preventers Matter

A backflow preventer is a device that stops water from flowing backward into the public water system. This protects drinking water from being contaminated by things like fertilizers, pool chemicals, or even bacteria from irrigation systems. It’s a safeguard—and the City takes it seriously.

Who Needs One?

Not every residential property in San Diego is required to have a backflow preventer. But if your home has a water meter that’s 1.5 inches or larger, you’re responsible for having one installed. These are often required in homes with larger irrigation systems, pools, or multiple units on the same property.

The City doesn’t just suggest it—they mandate it. And once installed, the homeowner is responsible for making sure it’s tested and working properly year after year.

Where It Needs to Go

Backflow preventers must be installed above ground, not buried or tucked away. The City requires that the device is accessible and visible—usually located near the front of your property, close to the water meter. That way, it’s easy for a certified tester to access it during annual inspections

Stay Compliant and Protect Your Water Supply

San Diego’s strict residential backflow preventer requirements are in place to protect drinking water and keep communities safe. If your property has a backflow preventer, staying on top of testing and maintenance is essential. Missing a test can lead to fines, service disruptions, and potential health risks.

San Diego Backflow Testing is a trusted, family-owned business that handles everything from testing and repairs to new installations. When you call, you’ll speak directly with Adam or Jen. No middlemen, no confusion. They handle the paperwork, submit the test results to the city, and keep your system compliant year-round.

Take action now to avoid fines and protect your water supply. Upload your test form to schedule a test or call 877-363-8378 to speak with Adam or Jen. Staying compliant has never been easier!