EPA Air · stack tests by county and year
Air-emissions stack tests in Union County, Ohio, 2025
- 15Stack 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 Union County, Ohio during 2025. 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 Union County facility page.
Union County, Ohio, 2025
Air-emissions stack tests in Union County, other years
What stands out
- Stack tests in Union County, Ohio, rose from 3 in 2024, the previous year on file, to 15 in 2025.
- The county’s file for stack tests holds 9 years of events, from 2018 through 2026.
- Its 15 stack tests rank 30th of the 55 county cells in Ohio for 2025.
- Its 15 stack tests are 0.7% of the 2,217 the state’s file holds for 2025.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Union County, Ohio, 2025
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 Union county, OH, in 2025. It lists 15 stack tests recorded in 2025.