EPA Air · stack tests by county and year
Air-emissions stack tests in Frederick County, Virginia, 2026
- 3Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Frederick County, Virginia during 2026. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Frederick County facility page.
Frederick County, Virginia, 2026
- Inspections 52
Air-emissions stack tests in Frederick County, other years
Air-emissions stack tests recorded in Frederick County, Virginia, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-05-13 | CARDINAL ENERGY CORPORATION | Pass | State |
| 2026-04-15 | HP HOOD LLC | Pass | State |
| 2026-02-18 | O-N MINERALS (CHEMSTONE) COMPANY - MIDDLETOWN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.