EPA Air · stack tests by county and year

Air-emissions stack tests in Kern County, California, 2026

• 320Stack 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 Kern County, California 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 Kern County facility page.

Kern County, California, 2026

• Inspections 635

Air-emissions stack tests in Kern County, other years

• 2025 3,380
• 2024 7,524
• 2023 3,964
• 2022 5,839
• 2021 5,165
• 2020 8,397
• 2019 3,121
• 2018 3,352
• 2017 5,015

Air-emissions stack tests recorded in Kern County, California, 2026

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