EPA-regulated facilities in Dewey County, SD

There are 92 EPA-regulated facilities inside Dewey County, South Dakota. The most common kinds are water discharge (72), hazardous waste (7), air emissions (7). 1 is currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 2 have a violation on record. Penalties over the last five years total $2k across 1 site.

Open the map of Dewey County

92facilities in the county

1in significant noncompliance

2with a violation on record

$2kin penalties, last 5 years

By category

Category	Facilities
Hazardous waste	7
Small quantity generators	4
Superfund	2
Air emissions	7
Minor sources	1
Water discharge	72
Minor permits	36
Drinking water systems	5

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.

TIMBER LAKE WASTEWATER TREATMENT FACILITY SE1/4 SEC. 17, T17N, R25E, TIMBER LAKE, SD, 57656 Significant noncompliance

Largest penalties

Penalties assessed over the last five years.

NH-8 0212(184)143, DEWEY COUNTY, PCN 04XG US212 1.7 MILES WEST OF LANTRY, LANTRY, SD, 57636 $2k in penalties

Superfund sites

ARMSTRONG COUNTY ATG GUN RGE 6 MILES EAST OF EAGLE BUTTE, EAGLE BUTTE, SD, 57625
ISABEL HERBICIDE SPILL SITE INTERSECTION OF HIGHWAYS 63 AND 20, ISABEL, SD, 57633

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.