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EPA-regulated facilities in St. Louis County, MO

There are 7,497 EPA-regulated facilities inside St. Louis County, Missouri. The most common kinds are hazardous waste (3,842), water discharge (3,326), air emissions (854). 22 are currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 107 have a violation on record. Penalties over the last five years total $5.7M across 15 sites.

Open the map of St. Louis County

7,497facilities in the county
22in significant noncompliance
107with a violation on record
$5.7Min penalties, last 5 years

By category

CategoryFacilities
Hazardous waste3,842
Treatment, storage or disposal3
Large quantity generators56
Small quantity generators1,114
Transporters19
Chemical (RMP/TRI)260
Superfund36
Air emissions854
Major sources18
Synthetic minor sources29
Minor sources574
Water discharge3,326
Major permits8
Minor permits2,701
Drinking water systems222
Greenhouse gas reporters7
Data centers2
Scrap yards4
Recycling centers2

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.

Largest penalties

Penalties assessed over the last five years.

Superfund sites

Data centers

Towns in St. Louis County

Bordering counties

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. The Data page explains where each record comes from and how it can mislead.