Cross-Connection Control Program

Safe Drinking Water and Cross-Connection Control

The City of Mt. Vernon delivers thousands of gallons of safe, high-quality drinking water to residents and businesses every day. Our water meets all state and federal drinking water standards and undergoes rigorous testing to ensure safety and quality. However, the safety of our water depends on proper management of cross-connections, which can pose risks to the water supply.

A cross-connection is a potential link between the drinking water system and a non-potable source. If improperly managed, it can lead to contamination caused by backflow from unsafe substances. The City of Mt. Vernon takes this issue seriously and has partnered with BSI Online to administer the cross-connection control program in our community.

Frequently Asked Questions

What is the cross-connection control program?

The Illinois Environmental Protection Agency (IEPA) requires every water supply to develop and implement a cross-connection (backflow prevention) control program. The City of Mt. Vernon partners with BSI Online to ensure proper implementation and monitoring of this program.

What is a cross-connection and a backflow preventer?

• Cross-Connection: A connection between a potable (safe for drinking) water supply and a non-potable source, where contaminants could potentially enter the water system.
• Backflow Preventer: A device that allows water to flow in one direction only, preventing contamination from flowing back into the water supply.

Examples of potential contaminants

Who has responsibility for installing backflow preventers?

Property owners are responsible for installing, maintaining, and testing backflow preventers annually. Water customers must hire a licensed professional to perform the required tests and complete any necessary repairs. Most plumbing contractors can install, repair, and certify backflow preventers.

Where would a backflow preventer be found on a water customer’s piping?

Residential backflow preventers are commonly located on:

• Lawn irrigation systems.
• Hot water heating (boiler) systems.
• Swimming pool fills.
• Water features, such as fountains or ponds.

Why did I receive a water survey from the City?

The Illinois Environmental Protection Agency (IEPA) requires every water supply to develop and implement a cross-connection (backflow prevention) control program.

As part of this program, the City sends a survey to all residential water customers every two years. The most recent survey was completed in 2024, and the next survey will be conducted in 2026. All water customers are required to complete and return this survey, which takes only a few minutes.

How do I respond to the survey?

Instructions for completing the next survey in 2026 will be provided at that time. Details will include options for submitting your responses, whether by mail, email, or other methods. Please check back closer to the survey date for updated information.

What happens if I do not fill out the survey?

Participation in the survey is mandatory for all water customers. Failure to complete and return the survey may result in penalties, fines, or service interruptions. To avoid any issues, we strongly encourage everyone to respond promptly and help the City maintain accurate records and comply with IEPA requirements.

Have questions about backflow protection?

If you aren’t sure whether you have or need backflow protection, or if you have other questions, please feel free to contact the Public Works Department at:

• Phone: 618-242-6850