A backflow preventer is designed to stop dirty water from flowing back into your clean plumbing lines, and testing it regularly is the only way to know it’s doing its job. At Caldwell Plumbing, we help homeowners across Durham Region stay protected with simple, reliable backflow testing that keeps your system in check.

What a Backflow Preventer Does – and Why It Matters

A backflow preventer is a small but important device that protects your home’s drinking water. It works by creating a one-way barrier in your plumbing system, making sure used or contaminated water doesn’t flow backward toward the clean water supply.

Backflow can happen when there’s a sudden change in water pressure, like during a water main break or when firefighters open a nearby hydrant. That pressure shift can pull dirty water from irrigation lines, hose attachments, or even sump systems into your household pipes. A working backflow preventer keeps that from happening.

Testing Your Backflow Preventer Is a Plumbing Must

Backflow preventers don’t last forever. Over time, the internal valves and seals can wear out or get blocked by debris. Without regular backflow preventer testing, you wouldn’t know there’s a problem until it’s too late.

That’s why annual testing is a plumbing must – especially for homes with sprinkler systems, boilers, or other cross-connection risks. At Caldwell Plumbing, we offer certified backflow testing throughout Durham Region. We’ll make sure your system is working the way it should.

How Backflow Testing Protects Your Plumbing Safety

Backflow testing gives you peace of mind that your plumbing system is doing what it’s supposed to do: protect your water, your family, and your health.

Our team of licensed plumbers is trained to catch small issues before they turn into serious risks to plumbing safety, so you can feel confident about what’s coming out of your taps.

When and How to Schedule Your Backflow Test

Most backflow devices should be tested once a year, though you may need testing more often if your system has been recently installed, repaired, or altered. Testing should always be done by a licensed plumber who understands the system and knows how to file the correct documentation.

Caldwell Plumbing makes it easy to schedule backflow testing across Durham Region, with flexible appointments and upfront pricing for all of our plumbing system maintenance services.

What To Expect When Your Backflow Preventer Is Tested

Having your backflow preventer tested is a quick and low-disruption service when handled by a professional. Here’s what’s involved:

1. Your water may be briefly shut off during the test.
2. The plumber checks pressure levels, valve function, and signs of internal failure.
3. If the preventer passes, you’ll receive documentation for your records—or for the city, if required.
4. If there’s an issue, you’ll get clear recommendations for repair or replacement.

Book Your Backflow Preventer Test With Caldwell Plumbing Today

If it’s been more than a year since your last test – or you’re not sure if you’ve ever had one – now’s the time. Backflow preventer testing is a simple way to protect your home’s water, meet code requirements, and avoid plumbing issues down the line.

Caldwell Plumbing provides certified testing across Durham Region. Contact us today or book online to schedule your inspection.

Frequently Asked Questions

What is the difference between a backflow preventer and a backwater valve?

A backflow preventer stops contaminated water from flowing backward into your drinking water lines. A backwater valve prevents sewage from entering your home through the sewer line. They serve different purposes and are installed in different parts of your plumbing system.

Is backflow testing required by law?

Yes. Many municipalities require annual testing, particularly for homes with irrigation systems, boilers, or sump pumps.

Can I do the test myself?

No, you cannot. Testing must be done by a licensed plumber certified to inspect and report on backflow systems.

How long does the test take?

Most tests take 20–30 minutes, depending on the system and setup.