EPA-regulated facilities near O'Fallon, MO

There are 1,163 EPA-regulated facilities within 5 miles of O'Fallon, Missouri. The most common kinds are water discharge (876), hazardous waste (259), air emissions (70). 4 are currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 12 have a violation on record. Penalties over the last five years total $20k across 1 site.

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1,163facilities within 5 miles

4in significant noncompliance

12with a violation on record

$20kin penalties, last 5 years

By category

Category	Facilities
Hazardous waste	259
Treatment, storage or disposal	1
Large quantity generators	5
Small quantity generators	102
Transporters	2
Chemical (RMP/TRI)	25
Air emissions	70
Major sources	2
Synthetic minor sources	4
Minor sources	51
Water discharge	876
Major permits	2
Minor permits	844
Drinking water systems	34
Data centers	2
Scrap yards	2

A facility enrolled in several programs counts once in the total and once in each of its categories.

In significant noncompliance

The EPA's designation for its most serious or persistent violations, as of the latest data.

BMC O'FALLON 1440 TERRA LANE WEST, O'FALLON, MO, 63366 · 1.9 mi Significant noncompliance
DARDENNE PRAIRIE SM MS4 2032 HANLEY RD, O'FALLON, MO, 63368 · 2.6 mi Significant noncompliance
LAKE SAINT LOUIS COMMUNITY ASSOCIATION 100 COGNAC COURT, LAKE SAINT LOUIS, MO, 63367 · 2.7 mi Significant noncompliance
MEMC ELECTRONIC MATERIALS INC 501 PEARL DRIVE, O FALLON, MO, 63366 · 3.8 mi Significant noncompliance

Largest penalties

Penalties assessed over the last five years.

A SQUARE SYSTEMS INC. 808 CORPORATE CENTRE DRIVE, O'FALLON, MO, 63368 · 4.5 mi $20k in penalties

Data centers

CENTENE DATA CENTER WATERBURY AND WELDON SPRING RD - LOT A, O FALLON, MO, 63376 · 3.9 mi
CENTENE DATA CENTER 6430 WELDON SPRING DRIVE, OFALLON, MO, 63304 · 4.8 mi

County

St. Charles County

Nearby towns

Reading these numbers

These are regulatory records, not measurements of pollution. Most facilities appear because they hold a permit or file reports, and most of them are compliant; a listing is not a claim that a facility has polluted anything. Compliance status and penalties are the EPA's own determinations in data retrieved Oct 9, 2026. Distances are from the center of O'Fallon as the Census Bureau records it. The Data page explains where each record comes from and how it can mislead.