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EPA Air · stack tests by state and year

Air-emissions stack tests in California, 2025

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in California during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in California, 2025

California, other years

Air-emissions stack tests recorded in California, 2025

DateFacilityWhereKindAgency
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18ELK HILLS POWER LLCTUPMAN, Kern, CAPassLocal
2025-11-18JG BOSWELL CO- OIL MILLCORCORAN, Kings, CAPassLocal
2025-11-18JG BOSWELL CO- OIL MILLCORCORAN, Kings, CAPassLocal
2025-11-18JG BOSWELL CO- OIL MILLCORCORAN, Kings, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-18CHEVRON USA PRODUCTS INCTRACY, San Joaquin, CAPassLocal
2025-11-17MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC)MOSS LANDING, Monterey, CAPassLocal
2025-11-17MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC)MOSS LANDING, Monterey, CAPassLocal
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.