Cross-Connection & Backflow Control Program

To protect the City’s drinking water distribution system, the City of Modesto initiated the Cross-Connection and Backflow Control Program.

  1. Backflow Control Program

Water distribution systems are designed to distribute water to residences and businesses, with water flowing away from the supply. Backflow occurs when the water flows back to the supply, contaminating the clean water supply.

One of the most common causes is when one section of piping loses pressure. This creates a siphon, drawing water from an unknown source in the opposite direction back to the clean water supply. Another cause can be attaching a higher pressure device to the water supply, common for industrial customers.

Commercial Backflow Preventer
Small Backflow preventer
  1. What is a cross-connection?
  2. What is a backflow?
  3. What causes backflow?
  4. What can I do to safeguard my building/facility from backflow?
View All FAQs