Summer is finally here, and for most homeowners, that means dragging out the garden hose, firing up the sprinkler system, and maybe topping off the pool. All of that outdoor water use is great, but there’s one thing worth paying attention to before the season gets fully underway: backflow.

It sounds technical, but it’s actually a pretty straightforward concept, and knowing how to protect against it can keep your family’s drinking water clean and safe all summer long.

What Is Backflow, and Why Does It Matter?

Your home’s plumbing is designed to move water in one direction: from the main supply line to your faucets, appliances, hoses, and fixtures. Backflow happens when water reverses direction and flows back into the clean water supply, potentially pulling in contaminants along the way.

There are two main ways this can happen. The first is back-siphonage, which occurs when water pressure in the main supply drops suddenly, such as during a water main break or heavy municipal demand, creating a suction effect that pulls water back. The second is back-pressure, which happens when pressure on the downstream side of a system exceeds the supply pressure, forcing water the wrong direction.

Either way, the result can be contaminated water making its way into the lines you and your family drink from. That’s a problem worth preventing.

Hoses: A Surprisingly Common Risk

Garden hoses are one of the most overlooked sources of backflow risk around the house. When you drop the end of a hose into a bucket of soapy water, a pet dish, or a kiddie pool and leave it there, you’ve created a direct path for that water to siphon back if pressure drops in the line.

The fix is simple: never leave a hose submerged in any container or body of water. Attach a hose vacuum breaker to each outdoor spigot, and disconnect hoses from the spigot when you’re done using them. These small, inexpensive devices allow water to flow out normally but close automatically if backflow starts.

Sprinkler Systems: Where Backflow Preventers Are Non-Negotiable

Irrigation and sprinkler systems sit underground, where they’re in regular contact with soil, fertilizers, pesticides, and other contaminants. When backflow occurs in a sprinkler system, those contaminants can be pulled directly into your home’s water supply.

Most local codes require a backflow preventer on any in-ground irrigation system, and for good reason. The most common types are pressure vacuum breakers and reduced pressure zone (RPZ) assemblies. Pressure vacuum breakers are installed above ground and are a good fit for many residential setups. RPZ assemblies offer higher protection and are often required in areas with stricter regulations or where chemicals are regularly introduced into the irrigation line, such as fertilizer injection systems.

If you’re not sure whether your sprinkler system has a backflow preventer installed or when it was last tested, this is a good time to have a licensed plumber take a look. Many municipalities require annual testing by a certified professional to make sure the device is functioning correctly.

Pools: Don’t Forget the Fill Hose

Filling or topping off a pool is another backflow risk that often flies under the radar. If you’re using a garden hose to add water to the pool and the hose end is submerged below the waterline, you’ve got the same type of siphon risk as with a bucket.

Keep the hose end above the waterline at all times while filling. If your pool has a dedicated fill line connected to the plumbing system, make sure there’s a proper backflow preventer on that line. An air gap, which is simply a physical space between the water source and the pool surface, is the most reliable and code-friendly solution for dedicated fill connections.

Ready for a Backflow Check?

Summer should be simple. A quick inspection of your outdoor spigots, your sprinkler system, and your pool fill setup can give you real confidence that your water supply is protected through the whole season.

If you’d like a licensed plumber to inspect your backflow prevention devices or test your irrigation system’s preventer, Madsen is here to help. Call us today at (610) 356-4800 to schedule a visit, and enjoy summer knowing your home’s water is working exactly the way it should.