What is an RPZ valve and why do I need one?

An RPZ (Reduced Pressure Zone) valve is a backflow prevention device that stops contaminated water from flowing backward into your clean drinking water supply. It's required by most Illinois municipalities when you have an irrigation system, pool, or any connection that could introduce contaminants into the potable water system.

Where is an RPZ valve installed?

RPZ valves are typically installed above ground, downstream of the water meter, on the line feeding the irrigation system or other cross-connection. They must be accessible for annual testing and installed at least 12 inches above grade. We install protective enclosures to shield the valve from weather and freezing.

Does my RPZ valve need to be winterized?

Yes. RPZ valves contain water that will freeze and crack the valve body in Illinois winters. Before the first freeze, the valve must be shut off, drained, and the test cocks opened. Many homeowners have this done when their irrigation system is winterized. We offer winterization service and spring reactivation.

Do I need a permit for RPZ installation?

Yes. RPZ installation requires a plumbing permit in most municipalities. The valve must be tested and certified upon installation, and the test results are submitted to your local water authority. We handle the permit, installation, initial testing, and all paperwork.

What size RPZ valve do I need?

The RPZ valve is sized to match the water line feeding your irrigation system, typically 3/4 inch or 1 inch for residential systems. The size must be adequate for the flow demand of the irrigation system without causing excessive pressure drop. We size the valve based on your system's requirements and the municipal specifications.

Can an RPZ valve reduce my water pressure?

RPZ valves do create some pressure loss (typically 10-15 PSI) due to the internal check valves and relief valve. For most homes with adequate water pressure, this isn't noticeable. If your pressure is already marginal, we may recommend solutions like a larger valve size or a pressure booster to maintain adequate irrigation performance.

RPZ Valve Installation Naperville, IL | Wiz Plumbing

When You Need Expert RPZ Valve Installation

RPZ (Reduced Pressure Zone) backflow preventers protect your drinking water from contamination by irrigation systems, pools, and other potential sources. Many municipalities require RPZ valves for irrigation systems, and we're certified to install them.

We install RPZ valves that meet all local codes and pass inspection the first time. Our installations include proper enclosures for freeze protection and easy access for annual testing.

RPZ Installation Services:

RPZ valve installation
Backflow preventer installation
Irrigation system protection
Pool backflow protection
Enclosure installation
Code compliance
Permit coordination
Initial certification

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Common Questions

Our Magical Guarantee

Why Naperville Trusts The Wizard

Master Craftsmen

Same-Day Service

Honest Pricing

390+ 5-Star Reviews

Magical Savings Await

Your First Plumbing Service

Senior & Military Discount

Same-Day Add-Ons