EPA Air · stack tests by county and year
Air-emissions stack tests in Merrimack County, New Hampshire, 2026
- 6Stack 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 Merrimack County, New Hampshire 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 Merrimack County facility page.
Merrimack County, New Hampshire, 2026
- Inspections 10
Air-emissions stack tests in Merrimack County, other years
What stands out
- Stack tests in Merrimack County, New Hampshire, fell from 13 in 2025, the previous year on file, to 6 in 2026.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 6 stack tests rank 3rd of the 6 county cells in New Hampshire for 2026.
- Its 6 stack tests are 15.8% of the 38 the state’s file holds for 2026.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Merrimack County, New Hampshire, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-09-16 | WHEELABRATOR CONCORD COMPANY, L.P. | Pending | State |
| 2026-09-15 | FOSTER MATERIALS, INC. | Pending | State |
| 2026-06-25 | WHEELABRATOR CONCORD COMPANY, L.P. | Pass | State |
| 2026-06-24 | WHEELABRATOR CONCORD COMPANY, L.P. | Pass | State |
| 2026-04-16 | WHEELABRATOR CONCORD COMPANY, L.P. | Pass | State |
| 2026-04-15 | WHEELABRATOR CONCORD COMPANY, L.P. | 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 Merrimack county, NH, for 2026. Stack tests recorded in 2026: 4.