EPA-regulated facilities in Siskiyou County, CA

There are 844 EPA-regulated facilities inside Siskiyou County, California. The most common kinds are hazardous waste (642), water discharge (83), drinking water systems (63). 2 are currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 25 have a violation on record. Penalties over the last five years total $5.4M across 3 sites.

Open the map of Siskiyou County

844facilities in the county

2in significant noncompliance

25with a violation on record

$5.4Min penalties, last 5 years

By category

Category	Facilities
Hazardous waste	642
Large quantity generators	29
Small quantity generators	50
Transporters	5
Chemical (RMP/TRI)	8
Superfund	9
Air emissions	61
Major sources	1
Water discharge	83
Minor permits	77
Drinking water systems	63
Scrap yards	3
Recycling centers	1

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.

SISKIYOU CO.SERVICE AREA #5/CARRICK CA Significant noncompliance
MT. SHASTA WWTP 2500 GRANT ROAD, MOUNT SHASTA, CA, 96067 Significant noncompliance

Largest penalties

Penalties assessed over the last five years.

UPS - YREKA 1535 LUCAS ROAD, YREKA, CA, 96097 $5.3M in penalties
SW MAINTENANCE CORP 3116 STATE HIGHWAY 97, WEED, CA, 96094 $68k in penalties
SOUTHERN PACIFIC TRANSPORTATION CO 5750 SACRAMENTO AVE, DUNSMUIR, CA, 96025 $66k in penalties

Superfund sites

KLAMATH NATL FOREST T36-48N RI-2W, YREKA, CA, 96097
J.H. BAXTER & CO. 422 MILL ST., WEED, CA, 96094
WEED LIBRARY 780 SOUTH DAVIS, WEED, CA, 96094
DUNSMUIR MERCURY RESIDENCE 5807 CASTLE AVE., DUNSMUIR, CA, 96025
SOUTHERN PACIFIC TRANSPORTATION CO 5750 SACRAMENTO AVE, DUNSMUIR, CA, 96025 $66k in penalties
MT. HEBRON WORK CENTER T46N R7E SEC 32, MACDOEL, CA, 96058
BLUE LEDGE MINE SECTIONS 34, TOWNSHIP 48 N, RANGE 11 W, SEIAD VALLEY, CA, 96086
SISKON MINE T14N, R5E, SECS. 20-29, SOMES BAR, CA, 95568
MALIN CHRISTIAN CENTER, INC. 576 MAIN STREET, TULELAKE, CA, 96134

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.