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My Watershed


Top Ten TRI Releases by Chemical

In 2015, 327 facilities in Washington submitted 1,087 reports representing the use of 114 different chemicals or chemical groups. The largest chemical releases by weight in 2015 were:

  • Methanol (primarily from the pulp and paper industry).
  • Toluene (mostly from cleanup activities on the U.S. Department of Energy's Hanford Site, aircraft manufacturing, and a petroleum refinery).
  • Lead (mostly from cleanup activities on the U.S. Department of Energy’s Hanford Site, and military operations).

Lead (a persistent, bioaccumulative, and toxic chemical, or PBT) and lead compounds were the most frequently reported chemicals. 79 facilities reported lead compounds and 68 reported lead in 2015.

Washington Top Ten TRI Releases by Chemical, 2015 (in pounds)

Chemical Name

# of Reports

Released On Site

POTW Disposal*

Off-Site Disposal

Total Released 
(On Site + POTW* + Off-site Disposal)

Methanol

31

3,734,928

0

37,199

7,507,056

Toluene 

25

3,575,553

0

3,220

7,154,326

Lead 

68

3,246,153

16

170,350

6,662,672

Xylene (mixed isomers)

27

2,709,803

0

184,292

5,603,898

Nitrate compounds

46

1,396,702

0

785,935

3,579,340

Manganese compounds

20

459,155

0

686,262

1,604,571

Ammonia

30

925,012

0

126,841

1,976,865

Carbonyl sulfide

6

1,016,392

0

0

2,032,784

Hydrochloric acid (acid aerosols only)

12

815,856

0

0

1,631,712

Zinc compounds

22

30,447

0

618,043

678,937

All Others

778

3,981,076

359

1,831,567

9,794,079

Total

1,065

21,891,077

376

4,443,709

48,226,239

*Publicly Owned Treatment Works, metals only.

For a complete list of chemicals reported in 2015, download Washington TRI Releases by Chemical 2015 (Excel spreadsheet).