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Cross Connection Control Program

A cross connection is an improper and illegal plumbing arrangement between a potable and non-potable water supply. This connection, under certain hydraulic conditions, can lead to a dangerous "backflow" from a contaminated water system to drinking water.
The quality of Philadelphia's drinking water supply could be compromised if backflow from a non-potable supply containing hazardous substances occurs. The City of Philadelphia has Cross Connection Control Regulations to protect the public health and the integrity of its drinking water supply.

Cross Connection Control Resources


Cross Connection Control Manual

Full manual
Manual (without Appendix)
Appendix: 1-2, 3-13, 14-22, 23-24, 25-26, 27-31, Dwg-1-9

City Approved Backflow Prevention Assemblies and Technicians

City Approved Backflow Prevention Assemblies
Technicians for Domestic Water Systems
Technicians for Fire Sprinkler Systems

Note: The foregoing lists of approved backflow assemblies and approved technicians are updated periodically.

Backflow Prevention Forms

Form CU100 - Facility Update on Backflow Prevention
Form CP100 - Backflow Prevention Assembly Installation Permit Application
Form CR100 - Certified Backflow Assembly Technician Registration Form
Form 79-770 - Backflow Prevention Assembly Test and Maintenance Record

Frequently Asked Questions