EPA Air · stack tests by state and year
Air-emissions stack tests in California, 2026
- 979Stack tests
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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in California, 2026
- Kern County 320
- Stanislaus County 246
- San Joaquin County 187
- Kings County 54
- Los Angeles County 39
- Merced County 32
- Madera County 20
- San Bernardino County 19
- Monterey County 19
- Tulare County 14
- Ventura County 13
- Sacramento County 5
- Orange County 4
- Riverside County 4
California, other years
Air-emissions stack tests recorded in California, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | VRSD OXNARD LANDFILLS | OXNARD, Ventura, CA | Pass | Local |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-07 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-06 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Pass | Local |
| 2026-05-05 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-05 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-04 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-04 | DARLING INTERNATIONAL | CROWS LANDING, Stanislaus, CA | Fail | Local |
| 2026-05-04 | DARLING INTERNATIONAL | CROWS LANDING, Stanislaus, CA | Fail | Local |
| 2026-05-04 | DARLING INTERNATIONAL | CROWS LANDING, Stanislaus, CA | Fail | Local |
| 2026-05-04 | DARLING INTERNATIONAL | CROWS LANDING, Stanislaus, CA | Fail | Local |
| 2026-05-04 | DARLING INTERNATIONAL | CROWS LANDING, Stanislaus, CA | Fail | Local |
| 2026-05-04 | DARLING INTERNATIONAL | CROWS LANDING, Stanislaus, CA | Fail | Local |
| 2026-05-01 | SO CAL GAS - NEWBERRY SPRINGS | NEWBERRY SPRINGS, San Bernardino, CA | Pass | Local |
| 2026-05-01 | PREGIS INNOVATIVE PACKAGING INC | VISALIA, Tulare, CA | Pass | Local |
| 2026-05-01 | PREGIS INNOVATIVE PACKAGING INC | VISALIA, Tulare, CA | Pass | Local |
| 2026-05-01 | PREGIS INNOVATIVE PACKAGING INC | VISALIA, Tulare, CA | Pass | Local |
| 2026-05-01 | PREGIS INNOVATIVE PACKAGING INC | VISALIA, Tulare, CA | Pass | Local |
| 2026-05-01 | PREGIS INNOVATIVE PACKAGING INC | VISALIA, Tulare, CA | Pass | Local |
| 2026-05-01 | PREGIS INNOVATIVE PACKAGING INC | VISALIA, Tulare, CA | Pass | Local |
| 2026-04-30 | CAL PORTLAND CEMENT | ORO GRANDE, San Bernardino, CA | Pass | Local |
| 2026-04-30 | SACRAMENTO MUNICIPAL UTILITY DIST. FINANCING AUTHORITY DBA PROCTER GAMBLE POWER — high-priority violation on file | SACRAMENTO, Sacramento, CA | Pending | Local |
| 2026-04-30 | EF OXNARD LLC | OXNARD, Ventura, CA | Pass | Local |
| 2026-04-29 | SO CAL GAS - BLYTHE | BLYTHE, Riverside, CA | Pass | Local |
| 2026-04-29 | SO CAL GAS - BLYTHE | BLYTHE, Riverside, CA | Pass | Local |
| 2026-04-28 | SUNSHINE CYN LANDFILL REPUBLIC SERV INC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-04-28 | SOUTHERN CALIFORNIA EDISON | RANCHO CUCAMONGA, San Bernardino, CA | Pass | Local |
| 2026-04-28 | E&J GALLO WINERY — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-04-28 | E&J GALLO WINERY — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-04-28 | E&J GALLO WINERY — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-04-28 | AERA ENERGY LLC | VENTURA, Ventura, CA | Pass | Local |
| 2026-04-27 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-04-22 | SO CAL GAS - SO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-04-21 | SO CAL GAS - NO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-04-20 | THUMS LONG BEACH CO — high-priority violation on file | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2026-04-20 | PACIFIC ETHANOL STOCKTON — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-04-20 | PACIFIC ETHANOL STOCKTON — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-04-16 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-04-16 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-16 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-16 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-04-16 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-04-16 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-04-16 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-04-15 | LA CO. SANITATION DIST | CARSON, Los Angeles, CA | Pass | Local |
| 2026-04-13 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-13 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-13 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-09 | SO CAL GAS - BLYTHE | BLYTHE, Riverside, CA | Pass | Local |
| 2026-04-09 | SO CAL GAS - BLYTHE | BLYTHE, Riverside, CA | Pass | Local |
| 2026-04-09 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-09 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.