EPA-regulated facilities in San Luis Obispo County, CA

There are 5,003 EPA-regulated facilities inside San Luis Obispo County, California. The most common kinds are hazardous waste (3,909), water discharge (568), air emissions (518). 5 are currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 28 have a violation on record. Penalties over the last five years total $8.5M across 9 sites.

Open the map of San Luis Obispo County

5,003facilities in the county

5in significant noncompliance

28with a violation on record

$8.5Min penalties, last 5 years

By category

Category	Facilities
Hazardous waste	3,909
Treatment, storage or disposal	1
Large quantity generators	70
Small quantity generators	320
Transporters	45
Chemical (RMP/TRI)	29
Superfund	4
Air emissions	518
Major sources	6
Synthetic minor sources	13
Minor sources	1
Water discharge	568
Major permits	11
Minor permits	516
Drinking water systems	195
Greenhouse gas reporters	5
Data centers	1
Scrap yards	3
Recycling centers	4

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.

HERITAGE RANCH CSD 4870 HERITAGE RD, PASO ROBLES, CA, 93446 Significant noncompliance · $24k in penalties
CITY OF PASO ROBLES WASTEWATER TREATMENT FACILITY 3400 SULPHUR SPRINGS RD, PASO ROBLES, CA, 93446 Significant noncompliance · $18k in penalties
CITY OF EL PASO DE ROBLES LANDFILL 9000 HIGHWAY 46 EAST, PASO ROBLES, CA, 93446 Significant noncompliance
SANTA MARIA FACILITY 2555 WILLOW RD., ARROYO GRANDE, CA, 93420 Significant noncompliance
PG&E DIABLO CANYON 3890 AVILA BEACH, AVILA BEACH, CA, 93424 Significant noncompliance

Largest penalties

Penalties assessed over the last five years.

UNITED PARCEL SERVICE 3601 SACRAMENTO DR, SAN LUIS OBISPO, CA, 93401 $5.3M in penalties
CALIFORNIA MENS COLONY HIGHWAY 1, SAN LUIS OBISPO, CA, 93409 $1.6M in penalties
CALIFORNIA MEN’S COLONY WATER TREATMENT PLANT HIGHWAY 1 NORTH, SAN LUIS OBISPO, CA, 93409 $1.5M in penalties
SAN LUIS OBISPO WWTP 35 PRADO RD, SAN LUIS OBISPO, CA, 93401 $69k in penalties
SOUTH SAN LUIS OBISPO SD WWTP 1600 ALOHA PLACE, OCEANO, CA, 93445 $6k in penalties

Superfund sites

RINCONADA MINE T 30S, R 14E, SEC 21, S 1/2 MT DIABLO ME, SANTA MARGARITA, CA, 93453
USDLA DEFENSE FUEL SUPPLY PT MORRO BAY 3300 PANORAMA DRIVE, MORRO BAY, CA, 93442
CAMP ROBERTS TRAINING SITE HIGHWAY 101, CAMP ROBERTS, CA, 93451
KLAU/BUENA VISTA MINE 344 KLAU MINE RD., PASO ROBLES, CA, 93446

Data centers

Digital West Data Center

Towns in San Luis Obispo 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.