EPA Air · stack tests by county and year

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

14Stack 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 Delaware 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 Delaware County facility page.

Delaware County, Pennsylvania, 2025

Air-emissions stack tests in Delaware County, other years

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

Date	Facility	Kind	Agency
2025-10-31	KIMBERLY CLARK CORP/CHESTER OPR	Pass	State
2025-10-14	MONROE ENERGY LLC/TRAINER — high-priority violation on file	Pass	State
2025-09-24	REWORLD DELAWARE VALLEY LP/DELAWARE VALLEY RES REC — high-priority violation on file	Pass	State
2025-08-13	NEW CONGOL/TRAINER PLT — high-priority violation on file	Pass	State
2025-07-02	DELAWARE CNTY REG WA/DELCORA WESTERN REG TRMT PLT	Pass	State
2025-07-01	DELAWARE CNTY REG WA/DELCORA WESTERN REG TRMT PLT	Pass	State
2025-07-01	HEIDELBERG MTLS NORTHEAST PA / GLEN MILLS HMA PLT — high-priority violation on file	Pass	State
2025-06-18	REWORLD DELAWARE VALLEY LP/DELAWARE VALLEY RES REC — high-priority violation on file	Pass	State
2025-06-11	ENERGY TRANSFER MKT & TERM LP/TWIN OAKS TERM	Pass	State
2025-06-10	ENERGY TRANSFER MKT & TERM LP/TWIN OAKS TERM	Pass	State
2025-04-03	BOEING CO PHILA/RIDLEY PARK PA FAC — high-priority violation on file	Pass	State
2025-04-03	BOEING CO PHILA/RIDLEY PARK PA FAC — high-priority violation on file	Pass	State
2025-03-04	VILLANOVA UNIV/MAIN CAMPUS	Pass	State
2025-01-21	VILLANOVA UNIV/MAIN CAMPUS	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 stack tests at Clean Air Act facilities in Delaware county, PA, for 2025. It lists 14 stack tests recorded in 2025.