Photos of the Long Island Sound

Research & Monitoring

Status & Trends

LISS Ecosystem Targets and Supporting Indicators

Industrial Chemical Discharges (TRI data – Total LIS watershed and CT and NY portion of watershed)

Industrial Chemical Discharges (CT NY portion of watershed and Total LIS watershed)
  Total On-Site Releases, CT and NY* (millions of pounds) Surface Water Discharges, CT and NY (millions of pounds)
1988 35.145140 6.086450
1989 28.295206 4.758350
1990 23.190682 4.016130
1991 21.825380 3.906330
1992 18.222353 3.070790
1993 14.190793 2.347560
1994 11.625295 2.229990
1995 9.110131 1.490960
1996 7.487323 0.659290
1997 7.206303 0.671470
1998 5.687147 0.600930
1999 5.980331 1.013122
2000 7.938990 0.816719
2001 7.109360 0.785849
2002 5.708990 0.756887
2003 5.371430 0.731102
2004 4.751040 0.470025
2005 4.507312 0.473471
2006 3.969591 0.504173
2007 3.538951 0.442516
2008 2.727167 0.253150
2009 2.365252 0.310493
2010 1.887027 0.300821
2011  1.348123  0.243856
2012  1.240068  0.223976
2013  1.470574  0.209801
2014  1.256123  0.084907
2015  1.045478  0.068699
2016  0.941312  0.038256
On-Site releases for total LIS watershed, including upper watershed states (pounds)
  Land Water Air
2003 112,770 646,595 6,527,346
2004   61,009 432,692 5,470,965
2005  36,368 330,646 5,146,791
2006  20,636 455.288 4,219,420
2007  59,806 392,541 3,988,944
2008  24,120 175,548 3,227,530
2009  21,313 175,956 2,781,267
2010  84,077 164,110 1,883,924
2011  37,994 117,733 1,382,262
2012  10,926 137,904 1,226,061
2013    2,303 138,574 1,591,474
2014   1,926 64,866 1,690,405
2015   2,826 54,900 1,250,298
2016      662 38,242 1,136,723

WHAT ARE INDUSTRIAL CHEMICAL DISCHARGES?

The EPA maintains the Toxics Release Inventory (TRI), a national database that identifies more than 600 designated toxic chemicals manufactured and used at industrial facilities and the annual amounts of these chemicals released as waste.

WHAT DOES THIS INDICATE?

The decline in industrial chemical discharges indicates progress in reducing the release of contaminants into Long Island Sound’s watershed.

STATUS

Toxic releases in the Sound’s watershed have declined by more than 90 percent since the late 1980s. This is consistent with trends in toxic releases throughout the country. Facilities releasing industrial chemicals have been improved with better emissions-reducing technology.  There has also been an increase in the national awareness of the harmful effects of toxic releases. Air emissions account for the majority of on-site releases.

DATA NOTE

*Total on-site releases include air emissions, other on-site land releases, and surface water discharges.

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