Illinois · population 32,169
Lead pipes in O'Fallon, IL
33 lead or galvanized lines to replace
Most of O'Fallon (population 32,169) gets its water from O Fallon. That system reported 0 lead and 33 galvanized-requiring-replacement service lines out of 18,810, with 457 more of unknown material.
0.2% of O Fallon's service lines are lead or galvanized requiring replacement, lower than the Illinois average (17%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0.2%
- Unknown 2.4%
- Non-lead 97%
Latest lead test for O Fallon (Jan 2026–Dec 2028): not detected at the 90th percentile, against a 15 ppb federal action level. Full test history.
Compliance record: EPA lists no Lead and Copper Rule violations since 2015 for O Fallon.
Water systems serving O'Fallon
| Water system | Lead | Galv. | Unknown | % lead |
|---|---|---|---|---|
| O FallonMain system | 0 | 33 | 457 | 0.2% |
| IL American-East St LouisServes nearby areas | 749 | 351 | 34,431 | 1.5% |
Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.
Check your address in O'Fallon
The counts above cover the whole water system. To see whether your line is lead, look up your address on O Fallon's official inventory. Utilities had to make these public by October 16, 2024.
No map yet? Do the 2-minute scratch and magnet test.
Protect your drinking water
If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.
Choosing a lead-certified filter · Testing your water · Replacement cost
Nearby cities
- Shiloh1,100 lead + galv. lines
- Fairview Heights33 lead + galv. lines
- Swansea1,100 lead + galv. lines
- Lebanon1,423 unknown
- Caseyvilleno lead reported
- Belleville1,100 lead + galv. lines
- Collinsville13 lead + galv. lines
- Mascoutah5 lead + galv. lines
Check another water system
Questions
Does O'Fallon, IL have lead pipes?
Yes. O Fallon, which serves O'Fallon, reported 0 lead and 33 galvanized-requiring-replacement service lines, plus 457 of unknown material.
Who supplies water to O'Fallon?
EPA's service area maps place most of O'Fallon in O Fallon's service area (PWSID IL1631100). IL American-East St Louis also serves parts of the city or nearby areas.
How do I check whether my O'Fallon home has a lead service line?
Search your address on O Fallon's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.
When will lead pipes in O'Fallon be replaced?
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask O Fallon whether your street is scheduled and whether it covers the private side.