Facility detail

ST CHARLES OPERATIONS (TAFT/STAR) UNION CARBIDE CORP

355 LA HWY 3142 (GATE 1), HAHNVILLE, LA, 70057

Parent company: DOW INC

Carcinogen PBT — EPA classifications across all reporting years

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Year-over-year total releases

Reported on-site TRI releases in pounds (lbs), grouped by reporting year.

Top chemical totals

The 10 chemicals with the highest cumulative on-site releases in pounds (lbs) across all available years.

Full release table

Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.

All values in pounds (lbs)
Year	Ethylene	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	Propylene	Ammonia	Dichlorodifluoromethane (CFC-12)	Total (lbs)
2024	121,548	—	23,045	76,964	—	406,235
2023	125,749	63,509	29,508	37,924	—	360,969
2022	113,140	123,435	16,812	43,320	—	422,632
2021	128,634	383,886	30,166	41,660	—	717,326
2020	127,455	78,832	147,266	24,301	—	555,133
2019	162,106	316,647	33,243	21,030	—	713,063
2018	209,776	103,525	53,672	18,991	—	580,345
2017	210,967	76,825	66,534	15,527	—	561,453
2016	149,130	50,087	38,827	16,703	—	469,535
2015	120,371	216,079	40,694	15,362	—	599,136
2014	92,254	67,571	35,834	25,450	—	428,175
2013	118,230	65,859	50,400	24,631	—	501,340
2012	69,900	73,600	43,100	25,280	—	454,209
2011	74,500	88,500	25,700	26,000	—	399,450
2010	79,600	50,700	43,500	30,140	—	380,194
2009	147,900	53,000	24,912	38,080	—	470,338
2008	908,600	58,162	48,419	85,800	—	1,286,184
2007	114,755	60,181	39,919	39,681	—	635,488
2006	124,200	92,500	27,500	51,400	—	555,292
2005	363,700	145,000	71,800	40,830	—	856,253
2004	304,000	155,300	159,500	115,900	—	988,379
2003	385,851	268,000	187,067	58,556	—	1,155,945
2002	381,000	127,108	204,200	33,456	—	1,017,663
2001	283,300	156,000	177,600	31,093	—	873,835
2000	277,900	117,000	201,107	46,820	—	930,387
1999	344,400	175,000	265,955	39,300	—	1,132,169
1998	317,781	163,100	201,347	35,992	—	1,097,101
1997	354,993	165,500	198,825	35,433	—	1,145,898
1996	449,082	156,100	142,329	36,495	—	1,174,122
1995	723,710	143,760	182,645	38,643	—	1,537,880
1994	933,253	—	210,944	15,418	79,846	1,689,040
1993	506,820	—	23,159	12,916	334,515	1,520,043
1992	447,999	—	17,401	14,893	666,780	1,526,713
1991	353,570	—	18,364	18,282	—	767,977
1990	297,007	—	28,548	16,720	—	720,413
1989	386,167	—	32,352	14,487	—	912,203
1988	283,656	—	22,815	25,085	—	599,245
1987	621,858	—	—	11,320	—	1,050,886

▎ Facilities report to EPA's TRI once they manufacture, process, or use a listed chemical above set thresholds. Once that threshold is crossed, they must report actual releases regardless of size — so a small number reflects genuine low-level discharge, not a data error.