Backflow Prevention Device Inspection, Installation, & Certification

RPZ (Reduced Pressure Zone) valves are a type of backflow prevention device used to protect water supplies from contamination.

All local municipalities require annual testing for residential and commercial properties. Cahill performs annual testing. Call us when you are notified by your municipality.

Did You Know?

Illinois state law requires backflow protection devices be installed for lawn sprinklers, boiler feeds, and fire protection. These devices keep contaminated water from entering your potable water supply. Cahill installs, inspects, and certifies these devices.

water heater part
stainless steel plumbing backflow preventer

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John J. Cahill, Inc. 1515 Church Street
Evanston IL 60201

Phone: (847) 864-5225

Lic. # 058-196977

Business Hours: Monday - Friday: 7:30am - 5:00pm
Saturday & Sunday: Closed
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Showroom Hours: Monday - Friday: 10:00am - 3:00pm
Saturdays/other hours: By Appointment