Do You Need a Pressure Vacuum Breaker? A Twin Cities Homeowner's Guide to Backflow Prevention
If you have an in-ground sprinkler system, there’s a small device in your yard doing a big job: keeping lawn water from ever mixing with the water you drink.
It’s called a pressure vacuum breaker, or PVB, and most homeowners don’t give it a thought until a notice shows up from the water utility, or a plumber points at it and starts using terms they’ve never heard. We get it, and we’ve got you.
We’ll explain PVBs (in plain language!), including why Minnesota requires one, and what you need to know about installation and yearly testing.
What is a pressure vacuum breaker (PVB)?
A pressure vacuum breaker is a backflow preventer made for lawn irrigation. It sits on the supply line that feeds your sprinklers, and its whole purpose is to make sure water flows one direction only: out to the lawn, never back toward the house.
Inside, it’s straightforward. A spring-loaded check valve holds the line closed against backward flow, and an air inlet vent opens if the pressure behind it drops. Working together, they physically stop water from reversing course.
You’ll find the PVB above ground, mounted at least 12 inches above your highest sprinkler head, usually near the main irrigation shutoff. That height isn’t for looks. It’s part of what lets the device do its job.
Why your PVB matters for your drinking water
Most of the time, city water pushes steadily in one direction. But if the main-line pressure suddenly drops, which can happen when a hydrant is opened nearby, when a water main breaks, or during a heavy draw upstream, the flow can briefly reverse and pull water backward through the pipes.
Without a working backflow preventer, the water getting pulled back toward the house could be irrigation water, which may carry lawn fertilizer, pesticides, soil bacteria, or animal waste. A PVB blocks that reversal before any of it reaches your drinking water. There’s nothing you have to switch on and nothing to monitor. It just holds the line when it counts.
Do you need a pressure vacuum breaker?
If you have an in-ground irrigation system in the Twin Cities, the answer is almost always yes. The Minnesota State Plumbing Code requires backflow prevention on lawn irrigation systems, and a PVB is the most common residential option because it mounts above ground and handles this kind of backsiphonage risk (that’s a fancy word for contaminated backflow that happens via suction).
Whether you’re in Minneapolis, St. Paul, or anywhere else in Minnesota, if your sprinklers connect to your home’s water supply, you’re expected to have a backflow preventer on that line. It’s the rule for a reason, since contaminated backflow is not your friend!
How homeowners usually find out they need a PVB
Almost nobody researches this topic for fun. Most people arrive here for one of a few reasons:
- A backflow testing notice showed up from the water utility.
- They’re installing a new irrigation or sprinkler system.
- A plumber or landscaper flagged the PVB during another project.
- An existing unit started leaking or spraying, or it failed its annual test.
If a “pressure vacuum breaker leaking” search is what brought you here, don’t sit on it. A PVB that’s dripping or spraying is often a PVB that has stopped protecting your water.
What PVB installation with Bonfe looks like
Good news: this is a quick one. A PVB installation is typically about a two-hour appointment, and we can often get you on the schedule the same day or the next.
Here’s what our licensed plumbers handle:
- Install the PVB at least 12 inches above your highest sprinkler head.
- Connect it to the irrigation supply line.
- Pressure-test the unit and confirm it passes.
- Pull a permit wherever the city requires one.
Licensed Bonfe plumber installs and tests new pressure vacuum breaker for irrigation system in Minneapolis
Minnesota’s code does let a homeowner install their own backflow preventer. Even so, we’d gently point you toward a licensed plumber for this job. The installation has to pass inspection, the device has to be tested by a certified tester, and if the connection isn’t airtight, the very thing meant to guard your drinking water can’t. It’s a small job with real consequences, so it’s worth getting right the first time.
The annual testing requirement for PVBs (and why it exists)
Minnesota’s plumbing code doesn’t stop at installation. Testable backflow devices installed on or after January 23, 2016 have to be tested every year by a certified tester, and Twin Cities municipalities enforce that requirement.
Why every year? The internal seals and check valves can wear, stick, or fail over time, and a PVB can look perfectly fine from the outside while no longer protecting your water. The test itself is quick when a certified tester performs it, and it’s the only reliable way to know the device still works.
This is where having one team helps. Bonfe does backflow testing as well as installation, so the same crew that puts your PVB in can keep it certified season after season. No separate tester to track down every spring.
Your warranty options
A PVB sits outdoors through Minnesota’s temperature swings, from January cold to July heat, so long-term coverage is worth considering. We offer two warranty options on PVB installations:
- A 10-year warranty
- Our Lifetime Parts & Labor Warranty
The Lifetime option gives you the most long-term peace of mind. As long as the coverage terms are met, you won’t be paying again for parts or labor on that device down the road.
Why choose Bonfe for backflow prevention
When a job’s whole point is protecting your drinking water, you want a team that does this work regularly. Bonfe offers:
- Licensed plumbers with real experience in Twin Cities backflow prevention and irrigation.
- Two warranty options, including our Lifetime Parts & Labor Warranty on recommended installations.
- Annual backflow testing available in-house, so one team both installs and certifies.
- Upfront pricing, so nothing changes on you once the job starts.
- 4.8 stars from more than 11,000 Google reviews.
- 100% family-owned, serving the Twin Cities since 1993.
- Regular rates from 7 a.m. to 10 p.m., seven days a week, plus 24/7/365 emergency service for after-hours issues.
Getting a backflow testing notice, planning a new sprinkler system, or eyeing a PVB that’s seen better days?
We’ve got you covered. Schedule your pressure vacuum breaker installation or annual backflow test today.
