EPA Air · stack tests by county and year

Air-emissions stack tests in Stanislaus County, California, 2025

• 579Stack 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 Stanislaus County, California 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 Stanislaus County facility page.

Stanislaus County, California, 2025

• Inspections 176

Air-emissions stack tests in Stanislaus County, other years

• 2026 246
• 2024 3,977
• 2023 595
• 2022 627
• 2021 1,917
• 2020 846
• 2019 349
• 2018 548
• 2017 382

Air-emissions stack tests recorded in Stanislaus County, California, 2025

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 Stanislaus county, CA, in 2025. It lists 579 stack tests recorded in 2025.