EPA-regulated facilities in Sierra County, CA
There are 119 EPA-regulated facilities inside Sierra County, California. The most common kinds are hazardous waste (65), air emissions (23), drinking water systems (22). 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 $261k across 1 site.
By category
| Category | Facilities |
|---|---|
| Hazardous waste | 65 |
| Large quantity generators | 3 |
| Small quantity generators | 10 |
| Chemical (RMP/TRI) | 1 |
| Air emissions | 23 |
| Major sources | 1 |
| Water discharge | 11 |
| Minor permits | 11 |
| Drinking water systems | 22 |
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.
- ORIGINAL SIXTEEN TO ONE MINE Significant noncompliance · $261k in penalties
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.