EPA Air · by county

Air-emissions sources in Weld County, Colorado

• 8,858Facilities

Every stationary source in Weld County, Colorado that holds a Clean Air Act permit or is otherwise tracked by an air agency — planned, under construction, operating, seasonal or temporarily closed. Sources EPA records as permanently closed are not listed.

By emissions classification in Weld County

A source’s classification is the size band its potential emissions put it in: a major source is large enough to need a Title V operating permit, a synthetic minor has accepted limits to stay below that line, and a minor source sits below it outright.

• Minor source 7,950
• Synthetic minor source 814
• Major source 89

Inspections in Weld County, by year

A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source.

• 2026 inspections 125
• 2025 inspections 440
• 2024 inspections 387
• 2023 inspections 289
• 2022 inspections 246
• 2021 inspections 323
• 2020 inspections 265
• 2019 inspections 152
• 2018 inspections 153
• 2017 inspections 178

Violations in Weld County, by year

A high-priority violation is the most serious class of Clean Air Act non-compliance an agency records against a source; a federally reportable violation is the next step down in severity.

• 2026 violations 4
• 2025 violations 77
• 2024 violations 128
• 2023 violations 89
• 2022 violations 43
• 2021 violations 116
• 2020 violations 66
• 2019 violations 47
• 2018 violations 53
• 2017 violations 29

Stack tests in Weld County, by year

A stack test measures what a source actually emits, at the stack, against the limit in its permit.

• 2026 stack tests 72
• 2025 stack tests 186
• 2024 stack tests 170
• 2023 stack tests 246
• 2022 stack tests 207
• 2021 stack tests 160
• 2020 stack tests 208
• 2019 stack tests 197
• 2018 stack tests 83
• 2017 stack tests 103

Inspections in Weld County, year by year · Violations in Weld County, year by year · Stack tests in Weld County, year by year

Other counties in Colorado

Every county in the state with at least three sources on file.

• Morgan County 61
• Otero County 40
• Ouray County 3
• Park County 17
• Phillips County 22
• Pitkin County 16
• Prowers County 53
• Pueblo County 162
• Rio Blanco County 402
• Rio Grande County 27
• Routt County 45
• Saguache County 14
• San Miguel County 37
• Sedgwick County 15
• Summit County 33
• Teller County 18
• Undetermined County 1,500
• Washington County 85
• Yuma County 152

Facilities

County as filed on the facility record. Figures from EPA’s ICIS-AIR download.