EPA Air · stack tests by county and year

Air-emissions stack tests in Marion County, Indiana, 2026

44Stack 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 Marion County, Indiana 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 Marion County facility page.

Marion County, Indiana, 2026

Air-emissions stack tests in Marion County, other years

Air-emissions stack tests recorded in Marion County, Indiana, 2026

Date	Facility	Kind	Agency
2026-07-23	MILESTONE CONTRACTORS LP	Pass	State
2026-07-23	MILESTONE CONTRACTORS LP	Pass	State
2026-07-23	MILESTONE CONTRACTORS LP	Pass	State
2026-07-23	MILESTONE CONTRACTORS LP	Pass	State
2026-06-24	HOWARD MATERIALS LLC — high-priority violation on file	Pass	State
2026-06-24	HOWARD MATERIALS LLC — high-priority violation on file	Pass	State
2026-06-24	HOWARD MATERIALS LLC — high-priority violation on file	Pass	State
2026-06-05	SUPERIOR METAL TECHNOLOGIES	Pass	State
2026-06-04	SUPERIOR METAL TECHNOLOGIES	Pass	State
2026-05-29	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-29	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-29	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-29	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-29	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-29	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-28	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-28	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-28	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-28	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-28	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-28	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-28	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-27	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-27	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-27	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-27	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-27	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-27	REWORLD INDIANAPOLIS INCORPORATED	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	Pass	State
2026-04-24	ALLISON TRANSMISSION INC SPEEDWAY MAIN CAMPUS — high-priority violation on file	Fail	State
2026-04-02	MPLX TERMINALS LLC - INDIANAPOLIS TERMINAL	Pass	State
2026-04-02	MPLX TERMINALS LLC - INDIANAPOLIS TERMINAL	Pass	State
2026-03-16	ZIONSVILLE COMPRESSOR STATION / PANHANDLE EASTERN PIPE LINE — high-priority violation on file	Pass	State
2026-03-16	ZIONSVILLE COMPRESSOR STATION / PANHANDLE EASTERN PIPE LINE — high-priority violation on file	Pass	State
2026-03-16	ZIONSVILLE COMPRESSOR STATION / PANHANDLE EASTERN PIPE LINE — high-priority violation on file	Pass	State
2026-02-12	ROLLS ROYCE CORPORATION	Pass	State
2026-02-12	ROLLS ROYCE CORPORATION	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.