Hydrogen cyanide
CAS # 74-90-8
64,293,697 lbs total reported releases across all facilities and years.
Facilities listed below reported releases of this chemical to the EPA Toxic Release Inventory (TRI). Quantities are self-reported annual totals in pounds, broken out by release pathway. Click any facility name for its full compliance profile.
National Release Trend (2015–2024)
-2% overall
| Year | Total Released (lbs) | Reporting Facilities | vs Prior Year |
|---|---|---|---|
| 2015 | 7,755,076 | 128 | — |
| 2016 | 9,182,614 | 119 | +18% |
| 2017 | 6,574,831 | 121 | -28% |
| 2018 | 6,842,752 | 121 | +4% |
| 2019 | 2,981,172 | 52 | -56% |
| 2020 | 5,841,997 | 121 | +96% |
| 2021 | 5,610,809 | 122 | -4% |
| 2022 | 5,645,292 | 124 | +1% |
| 2023 | 6,267,920 | 127 | +11% |
| 2024 | 7,591,232 | 134 | +21% |
Top Releasing Industries
| Industry Sector | Total Released (lbs) | Facilities |
|---|---|---|
| Professional, Scientific, and Technical Services | 0 | 1 |
| Manufacturing | 62,721,525 | 147 |
| Transportation and Warehousing | 754,590 | 1 |
| Mining, Quarrying, and Oil and Gas Extraction | 405,735 | 16 |
| Administrative and Support and Waste Management | 292,372 | 3 |
| Utilities | 119,475 | 2 |
| Facility | Location | Year | Total (lbs) | Air | Water |
|---|---|---|---|---|---|
| DP GLYCINE LLC (FORMERLY GEO SPECIALTY CHEMICALS) | DEER PARK, TX | 2024 | — | — | — |
| SABINE RIVER OPERATIONS | ORANGE, TX | 2024 | — | — | — |
| BAYTOWN OLEFINS PLANT | BAYTOWN, TX | 2024 | — | — | — |
| ASCEND PERFORMANCE MATERIALS CHOCOLATE BAYOU PLANT | ALVIN, TX | 2024 | 547,108 | 18,472 | — |
| CITGO CORPUS CHRISTI REFINERY EAST PLANT | CORPUS CHRISTI, TX | 2024 | 493,012 | 493,012 | — |
| HOLCIM TEXAS | MIDLOTHIAN, TX | 2024 | 396,698 | 396,698 | — |
| VALERO CORPUS CHRISTI REFINERIES - WEST PLANT | CORPUS CHRISTI, TX | 2024 | 382,162 | 382,162 | — |
| TOTALENERGIES PETROCHEMICALS & REFINING INC - PORT ARTHUR REFINERY | PORT ARTHUR, TX | 2024 | 381,949 | 381,949 | — |
| VALERO REFINING - NEW ORLEANS LLC - ST CHARLES REFINERY | NORCO, LA | 2024 | 370,639 | 370,639 | — |
| (VEOLIA) ELEMENTAL ENVIRONMENTAL SOLUTIONS LLC - GUM SPRINGS PLANT | ARKADELPHIA, AR | 2024 | 292,296 | 0 | — |
| TOTAL PORT ARTHUR REFINERY | PORT ARTHUR, TX | 2024 | 272,611 | 272,611 | — |
| PORT ARTHUR REFINERY | PORT ARTHUR, TX | 2024 | 240,263 | 240,263 | — |
| GALVESTON BAY REFINERY | TEXAS CITY, TX | 2024 | 214,000 | 214,000 | — |
| HEXCEL CORPORATION: SALT LAKE OPERATIONS | WEST VALLEY CITY, UT | 2024 | 176,276 | 176,276 | — |
| EXXONMOBIL BAYTOWN REFINERY | BAYTOWN, TX | 2024 | 160,915 | 160,000 | 120 |
| MARATHON PETROLEUM COMPANY LP - LOUISIANA REFINING DIVISION - GARYVILLE REFINERY | GARYVILLE, LA | 2024 | 159,621 | 159,621 | — |
| PHILLIPS 66 COMPANY WILMINGTON PLANT | WILMINGTON, CA | 2024 | 150,000 | 150,000 | — |
| LEHIGH CEMENT COMPANY LLC | MITCHELL, IN | 2024 | 138,772 | 138,772 | — |
| HOLCIM (US) INC. | HOLLY HILL, SC | 2024 | 122,719 | 122,719 | — |
| DELAWARE CITY REFINING COMPANY LLC | DELAWARE CITY, DE | 2024 | 114,657 | 114,473 | 184 |
| CHEVRON MM PASCAGOULA | PASCAGOULA, MS | 2024 | 114,000 | 114,000 | — |
| HOUSTON REFINERY | HOUSTON, TX | 2024 | 103,731 | 103,731 | — |
| VALERO REFINING - TEXAS, L.P. | TEXAS CITY, TX | 2024 | 100,000 | 100,000 | — |
| HOLLYFRONTIER EL DORADO REFINING | EL DORADO, KS | 2024 | 100,000 | 100,000 | — |
| TORRANCE REFINING COMPANY LLC | TORRANCE, CA | 2024 | 100,000 | 100,000 | — |
| PONCA CITY REFINERY | PONCA CITY, OK | 2024 | 98,892 | 98,892 | — |
| CITGO PETROLEUM CORP - LAKE CHARLES MANUFACTURING COMPLEX | SULPHUR, LA | 2024 | 88,240 | 88,240 | — |
| EXXONMOBIL BATON ROUGE REFINERY | BATON ROUGE, LA | 2024 | 86,000 | 86,000 | — |
| CHEVRON REFINERY RICHMOND | RICHMOND, CA | 2024 | 83,000 | 83,000 | — |
| CHALMETTE REFINING LLC | CHALMETTE, LA | 2024 | 82,600 | 82,600 | — |
| VALERO MEMPHIS REFINERY | MEMPHIS, TN | 2024 | 75,839 | 75,839 | — |
| HOLCIM US INC - STE. GENEVIEVE PLANT | BLOOMSDALE, MO | 2024 | 75,331 | 75,331 | — |
| HOUSTON REFINING LP | HOUSTON, TX | 2024 | 73,728 | 73,728 | — |
| PHILLIPS 66 COMPANY - LAKE CHARLES REFINERY | WESTLAKE, LA | 2024 | 73,374 | 73,374 | — |
| COUNTRYMARK REFINING AND LOGISTICS LLC | MOUNT VERNON, IN | 2024 | 71,343 | 71,343 | — |
| CYTEC ENGINEERED MATERIALS INC | ROCK HILL, SC | 2024 | 70,492 | 70,492 | — |
| E I DUPONT DE NEMOURS & COMPANY INC | MEMPHIS, TN | 2024 | 67,400 | 67,400 | — |
| TITAN FLORIDA LLC | MEDLEY, FL | 2024 | 62,670 | 62,670 | — |
| KROTZ SPRINGS REFINERY | KROTZ SPRINGS, LA | 2024 | 62,515 | 62,515 | — |
| MARATHON EL PASO REFINERY | EL PASO, TX | 2024 | 60,618 | 60,618 | — |
| DIAMOND SHAMROCK REFINING COMPANY, L.P. | SUNRAY, TX | 2024 | 57,000 | 57,000 | — |
| FLINT HILLS RESOURCES PINE BEND, LLC | ROSEMOUNT, MN | 2024 | 54,604 | 54,604 | — |
| EL DORADO REFINERY | EL DORADO, AR | 2024 | 54,558 | 54,558 | — |
| MARYNEAL CEMENT PLANT | MARYNEAL, TX | 2024 | 53,736 | 53,736 | — |
| ALON USA REFINERY | BIG SPRING, TX | 2024 | 52,475 | 52,475 | — |
| HOLCIM (US) INC. PORTLAND PLANT | FLORENCE, CO | 2024 | 52,144 | 52,144 | — |
| MARATHON ST. PAUL PARK REFINERY | ST. PAUL PARK, MN | 2024 | 52,000 | 52,000 | — |
| ROANOKE CEMENT COMPANY | TROUTVILLE, VA | 2024 | 51,792 | 51,792 | — |
| PHILLIPS 66 BAYWAY REFINERY | LINDEN, NJ | 2024 | 50,100 | 50,100 | — |
| VALERO WILMINGTON REFINERY | WILMINGTON, CA | 2024 | 48,000 | 48,000 | — |