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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Frederick county, VA, in 2026. Stack tests recorded in 2026: 3.