EPA Air · stack tests by state, industry and year

NAICS 9999: stack tests in Washington, 2024

• 7Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row is one stack test recorded during 2024 at a Washington source whose primary industry code is NAICS 9999. A facility filing more than one industry code is counted under the first one on its record.

NAICS 9999 in Washington, other years

• 2025 6
• 2023 4
• 2022 7
• 2021 16
• 2020 24
• 2019 23
• 2018 12
• 2017 29

Other industries in Washington, 2024

• Paper manufacturing (NAICS 3221) 88
• Mining and quarrying (NAICS 2123) 40
• Petroleum and coal products manufacturing (NAICS 3241) 27
• Utilities (NAICS 2211) 25
• Utilities (NAICS 2213) 23
• Transportation equipment manufacturing (NAICS 3364) 23
• Pipeline transportation (NAICS 4862) 20
• Chemical manufacturing (NAICS 3251) 17
• Chemical manufacturing (NAICS 3253) 9
• Merchant wholesalers, nondurable goods (NAICS 4247) 7
• Nonmetallic mineral product manufacturing (NAICS 3272) 6
• Primary metal manufacturing (NAICS 3311) 5
• Nonmetallic mineral product manufacturing (NAICS 3273) 5
• Wood product manufacturing (NAICS 3211) 4
• Support activities for transportation (NAICS 4883) 4
• Primary metal manufacturing (NAICS 3313) 4
• Primary metal manufacturing (NAICS 3315) 3
• Wood product manufacturing (NAICS 3212) 3
• Food manufacturing (NAICS 3119) 3

Air-emissions stack tests recorded in Washington, 2024

Primary NAICS code as filed on the facility record; dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.