EPA Air · stack tests by county and year
Air-emissions stack tests in Northampton County, Pennsylvania, 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 Northampton County, Pennsylvania 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 Northampton County facility page.
Northampton County, Pennsylvania, 2025
Air-emissions stack tests in Northampton County, other years
What stands out
- Stack tests in Northampton County, Pennsylvania, rose from 10 in 2024, the previous year on file, to 15 in 2025.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 15 stack tests rank 19th of the 48 county cells in Pennsylvania for 2025.
- Its 15 stack tests are 1.6% of the 957 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 Northampton County, Pennsylvania, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-29 | COLUMBIA GAS TRANS CORP/FORKS TWP FAC EASTON CTA | Pass | State |
| 2025-10-29 | ADELPHIA GATEWAY/MARTINS CREEK STA | Pass | State |
| 2025-10-17 | KEYSTONE PORTLAND CEMENT/EAST ALLEN — high-priority violation on file | Pass | State |
| 2025-10-15 | UE-02102PA LLC/FED EX ALLENTOWN | Pass | State |
| 2025-07-23 | HERCULES CEMENT CO LLC/STOCKERTOWN | Pass | State |
| 2025-07-17 | KEYSTONE PORTLAND CEMENT/EAST ALLEN — high-priority violation on file | Pass | State |
| 2025-06-20 | HEIDELBERG MATERIALS US CEMENT LLC/NAZARETH | Pass | State |
| 2025-06-19 | HEIDELBERG MATERIALS US CEMENT LLC/NAZARETH | Pass | State |
| 2025-06-10 | FRESHPET INC/BETHLEHEM | Pass | State |
| 2025-05-29 | ARIA ENERGY EAST LLC | Pass | State |
| 2025-05-21 | KEYSTONE PORTLAND CEMENT/EAST ALLEN — high-priority violation on file | Pass | State |
| 2025-03-26 | NORTHAMPTON GEN CO/NORTHAMPTON | Pass | State |
| 2025-03-18 | NORTHAMPTON GEN CO/NORTHAMPTON | Pass | State |
| 2025-02-25 | CALPINE BETHLEHEM LLC/BETHLEHEM — high-priority violation on file | Pass | State |
| 2025-01-30 | COLUMBIA GAS TRANS CORP/HELLERTOWN CT | 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 Northampton county, PA, in 2025. It lists 15 stack tests recorded in 2025.