Every property with underground irrigation faces two specific threats to its drinking water supply — back siphonage and back pressure. The Matheson team recently certified a Reduced Pressure Zone assembly in Novi that protects against both.
Back siphonage vs back pressure:
• Back siphonage — supply pressure drops and pulls contaminated water backwards through cross connections into the drinking supply
• Back pressure — pump pressure or elevation on the irrigation side exceeds supply pressure and pushes contaminated water backwards against normal flow direction
Standard preventer vs RPZ:
• Standard single check valve preventer resists back siphonage but lacks redundancy for back pressure — and fails silently when the check valve wears
• RPZ assembly uses two independent check valves with a differential relief valve — stops both threats and fails safely with visible discharge rather than silent contamination
Annual certification:
• Oakland County requires annual testing — Matheson completes testing, documentation, and submission on site for $95 flat
After 80 years the most trusted RPZ certification specialist in Oakland and Livingston County.
📞 248-363-4154
🌐 www.mathesonheating.com
