EPA Air · stack tests by county and year

Air-emissions stack tests in Simpson County, Mississippi, 2026

28Stack 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 Simpson County, Mississippi 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 Simpson County facility page.

Air-emissions stack tests in Simpson County, other years

Air-emissions stack tests recorded in Simpson County, Mississippi, 2026

Date	Facility	Kind	Agency
2026-05-06	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-06	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-06	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-06	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-06	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-06	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-05	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-05	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-05	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-05	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-05	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-05-05	ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-14	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	Pass	State

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