EPA Air · stack tests by county, year by year

Air-emissions stack tests in Pierce County, Washington, year by year

• 248Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every year on record for Pierce County, Washington, most recent first. Each year page lists the events recorded at sources in the county that year.

Pierce County, Washington, by year

• 2025 15
• 2024 16
• 2023 13
• 2022 22
• 2021 31
• 2020 46
• 2019 37
• 2018 37
• 2017 31

All sources in Pierce County →

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