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.

What this page shows

This page covers Clean Air Act facilities in the EPA air register with stack tests in Marion county, IN, in 2026. The page lists 44 stack tests recorded in 2026.