City of St. Paul Park 

on the Mississippi

Back Flow Preventers

Preventing Sewer Backflows

Reduced Pressure Zone (RPZ) backflow preventer valves are intended to help insure protection of the drinking water supply for occupants of your building and other users of the St. Paul Park municipal water system.  RPZ valves are mainly found on water systems involving food preparation and handling, healthcare facility equipment, commercial irrigation systems, and some residential irrigation systems.

In accordance with Minnesota State Plumbing Code Section 4715.2161 valves must be tested for proper operation.  The work must be performed by a Minnesota State licensed plumber with backflow testing certification.


City of St. Paul Park, 600 Portland Avenue, St. Paul Park MN 55071