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Lead service lines in O Fallon, MO

12 water utilities serve O Fallon, with approximately 142,677 people served.

Last verified from EPA SDWIS + utility inventories: 2026-04-14
Known lead
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Galvanized
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Lead Service Lines in O Fallon, MO

O Fallon is served by 12 water systems that together supply drinking water to about 142,700 people. Whether your home has a lead service line—the pipe that connects the water main under the street to your house—depends on which utility serves your address and when your home was built.

What we know about lead in O Fallon

The water systems serving O Fallon have not reported known lead service lines in their current inventories. However, this doesn't mean lead pipes don't exist in the area. Many utilities are still in the process of surveying their pipes, so inventories may be incomplete. Lead service lines were commonly installed before the 1980s, and some homes built before then may still have them.

The largest utility serving O Fallon is ST CHARLES COUNTY PWSD 2, which provides water to about 100,600 people. OFALLON PWS serves roughly 32,500 residents. Nine other smaller systems serve the rest of the city.

Why this matters

Lead service lines can leach lead into your drinking water, especially if the water is corrosive or if there is disturbance to the pipe. Infants, young children, and pregnant people are at highest risk of harm from lead exposure. If you're concerned about lead in your water, your pediatrician or the CDC can help you understand your individual risk.

How to find out if you have a lead service line

Contact your water utility directly. They can tell you:

  • Whether a lead service line serves your address
  • The results of any water testing at your property
  • Whether your utility has a lead service line replacement program

To identify your utility, you can call your city's public works department or check your water bill—it usually lists the utility name and contact information.

Next steps for residents

  • Call your water utility and ask whether your address is known to have a lead service line.
  • Request a free water test if your utility offers one.
  • Check your water bill or city website for your utility's contact information and any lead reduction programs.
  • Speak with your pediatrician if you have health concerns, especially for young children.

Utilities serving O Fallon

Common questions

Does O Fallon have lead in the water?

The utilities serving O Fallon have reported no known lead service lines, but inventories may still be incomplete. Lead service lines are more common in homes built before the 1980s. Contact your water utility to learn about your specific address.

How do I know if my house has a lead service line?

Call your water utility with your address. They can tell you whether a lead service line serves your home. You can also hire a plumber to inspect the pipe where it enters your house, though it may be underground.

Is lead in drinking water dangerous?

Lead exposure can harm brain development in young children and cause other health effects. Talk to your pediatrician or contact the CDC for guidance on testing and reducing your family's risk.

What should I do if my home has a lead service line?

Ask your utility about replacement programs or financial assistance. In the meantime, run water for 30 seconds before drinking or cooking, use cold water for drinking and cooking, and consider a certified lead-removing water filter if recommended by your utility.