EPA Air · stack tests by county and year

Air-emissions stack tests in Armstrong County, Pennsylvania, 2025

17Stack 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 Armstrong 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 Armstrong County facility page.

Armstrong County, Pennsylvania, 2025

Air-emissions stack tests in Armstrong County, other years

Air-emissions stack tests recorded in Armstrong County, Pennsylvania, 2025

Date	Facility	Kind	Agency
2025-11-13	EXCO APPALACHIA MIDSTREAM LLC/SAWMILL COMP STA	Pass	State
2025-11-12	PEOPLES NATURAL GAS CO LLC/ROARING RUN STA	Pass	State
2025-08-11	PEOPLES NATURAL GAS CO LLC/VALLEY STA	Pass	State
2025-08-05	SNYDER BROS INC/HOGBACK COMP STA	Pass	State
2025-07-21	INFINITY NATURAL RESOURCES SOUTH BEND COMP STA	Pass	State
2025-06-18	PEOPLES NATURAL GAS CO LLC/VALLEY STA	Pending	State
2025-06-17	PEOPLES NATURAL GAS CO LLC/VALLEY STA	Pass	State
2025-06-11	PEOPLES NATURAL GAS CO LLC/BELKNAP COMP STA	Pass	State
2025-05-22	SNYDER BROS INC/WHITE COMP STA	Pass	State
2025-05-21	SNYDER BROS INC/AMBROSE COMP STA	Pass	State
2025-05-20	SNYDER BROS INC/MUSHROOM MINE COMP STA	Pass	State
2025-05-15	SNYDER BROS INC/FURNACE RUN COMP STA	Pass	State
2025-05-15	SNYDER BROS INC/ENSIGN COMPRESSOR STATION	Pass	State
2025-05-01	EASTERN GAS TRANS & STORAGE/RURAL VLY COMP STA	Pass	State
2025-04-15	EQM GATHERING OPCO LLC/TERRA COMP STA	Pass	State
2025-02-06	INFINITY NATURAL RESOURCES SOUTH BEND COMP STA	Pass	State
2025-01-14	EXCO APPALACHIA MIDSTREAM LLC/POVERTY HILL COMP STA	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 and stack tests in Armstrong county, PA, in 2025. It lists 17 stack tests recorded in 2025.