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 cities to protect drinking water from possible contamination. This program helps make sure that unsafe water doesn’t get into our water system. The City of Mt. Vernon follows this rule by working with BSI Online to help keep our water safe.

What is a cross-connection and a backflow preventer?

• Cross-Connection: This happens when the clean drinking water line is connected to something that could be unsafe—like a hose in a bucket or pool.
• Backflow Preventer: This is a special device that stops dirty water from flowing backward into the clean water system.

What are some things that can contaminate water?

Who is responsible for backflow preventers?

Property owners must install and take care of these devices. A licensed plumber must check and test them every year to make sure they work. If repairs are needed, the plumber will fix them.

Where are backflow preventers usually found?

Backflow preventers may be installed on::

• Lawn sprinkler systems.
• Hot water heating systems (like boilers).
• Swimming pool fills.
• Fountains or decorative ponds

Why did I get a water safety survey?

The Illinois Environmental Protection Agency (IEPA) 

requires the City to send a short survey to all water customers every two years to help protect the water system. The last survey was in 2024. The next one will be in 2026. All water customers must fill it out.

How do I fill out the survey?

In 2026, the City will send you instructions with the survey. You will be able to return it by mail, email, or other ways.

What happens if I do not fill out the survey?

The survey is required by law. If you don’t return it, you could face a fine or lose your water service. Be sure to fill it out and return it on time.

Have questions about backflow or water safety?

Call the Mt. Vernon Public Works Department at 618-242-6850. We’re happy to help!