PlainEnviro

EPA TRI Chemical

Hydrogen Sulfide

CAS Number: 7783-06-4

Total releases
424.4M lbs
Number of facilities
570
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Hydrogen Sulfide (CAS 7783-06-4) is disclosed by 570 Form R facilities totaling 424.4M lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Hydrogen Sulfide (CAS 7783-06-4) is a chemical tracked by the EPA Toxics Release Inventory (TRI) program under Section 313 of the Emergency Planning and Community Right-to-Know Act. The TRI requires industrial facilities above specified threshold quantities to disclose annual manufacturing, processing, and otherwise-used volumes, along with quantities released to air, water, land, and off-site transfers.

A carcinogen flag, when present on other chemicals in this database, reflects an assessment from EPA, IARC, or the National Toxicology Program rather than a TRI-specific determination. The largest individual disclosure in the current dataset comes from DARK HORSE TREATING FACILITY in NM at 131.3M lbs.

TRI volumes are self-reported estimates, not measured stack emissions, and each pound counts equally regardless of chemical toxicity, so total pounds should not be equated with total risk. Inclusion of a chemical or facility in the TRI does not itself establish a health hazard; it documents the public right-to-know record. Consult EPA's IRIS (Integrated Risk Information System) and the Agency for Toxic Substances and Disease Registry for health-effect summaries.

LAND pathway mix

Hydrogen Sulfide: how the 424.4M lbs splits

424.4M lbs across all reported pathways

  • Land Disposal326.0M lbs76.8%
  • Air Releases83.8M lbs19.8%
  • Off-site Transfers13.2M lbs3.1%
  • Water Discharges1.3M lbs0.3%

Hydrogen Sulfide's 424.4M lbs Form-R total is LAND, with land disposal making up 76.8% of the bar. Next segment: air releases at 19.8%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Hydrogen Sulfide releases across all reporting facilities increased by 634% (27.6M lbs → 203.0M lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Hydrogen Sulfide is concentrated: New Mexico accounts for 46.4% of the reported total (12 facilities). Next: Texas.

  • New Mexico 196.9M lbs
  • Texas 118.2M lbs
  • North Dakota 28.8M lbs
  • North Carolina 13.5M lbs
  • Georgia 10.6M lbs
Industry Sources

Reporting for Hydrogen Sulfide is highly concentrated by industry: Natural Gas Processing facilities account for 76.9% of the reported total (25 facilities). Next: Paper.

  • Natural Gas Processing 326.6M lbs
  • Paper 50.0M lbs
  • Petroleum 18.8M lbs
  • Chemicals 17.7M lbs
  • Food 5.5M lbs

Which facilities release the most of this chemical?

Facilities with the largest reported releases of Hydrogen Sulfide. Up to 50 shown.

# Facility Release (lbs)
1 Dark Horse Treating Facility
131.3M lbs
2 Sand Hills Gas Plant
60.0M lbs
3 Midway Gas Plant
42.0M lbs
4 Oneok Rockies Midstream LLC - Grasslands Gas Plant
26.8M lbs
5 Jal 3 Gas Plant
22.0M lbs
6 Dagger Draw Gas Plant
15.8M lbs
7 Eunice Gas Plant
12.0M lbs
8 Maljamar Gas Processing Plant
11.2M lbs
9 Blanchard Refining Co LLC
10.2M lbs
10 Pcs Phosphate Co Inc
8.5M lbs
11 Monument Gas Plant
4.4M lbs
12 Rayonier Performance Fibers Jesup Mill
3.2M lbs
13 Futamura USA Inc
2.9M lbs
14 Georgia-Pacific Naheola LLC
2.4M lbs
15 Westrock Kraft Paper LLC
2.1M lbs
16 American Kraft Paper Industries LLC
1.9M lbs
17 International Paper
1.9M lbs
18 Viskase Cos Inc
1.7M lbs
19 Viskase Corp
1.7M lbs
20 International Paper-Pine Hill Mill
1.6M lbs
21 Uss-Clairton Plant
1.5M lbs
22 International Paper Rome Linerboard Mill
1.5M lbs
23 Suzano Packaging
1.3M lbs
24 Clearwater Paper - Augusta Mill
1.3M lbs
25 Georgia-Pacific Monticello LLC
1.2M lbs
26 Interstate Paper LLC DBA Dssmith Riceboro
1.2M lbs
27 Hood Container Corp
1.1M lbs
28 Georgia-Pacific Cedar Springs LLC
1.1M lbs
29 International Paper Co
1.1M lbs
30 Georgia-Pacific Brewton LLC
952.5K lbs
31 International Paper Franklin Mill
821.2K lbs
32 Ergon Refining Inc
805.5K lbs
33 Minn-Dak Farmers Cooperative
770.0K lbs
34 Domtar A.w. LLC Ashdown Mill
755.9K lbs
35 International Paper Georgetown Mill
737.7K lbs
36 Bp Products Na Whiting Business Unit
705.9K lbs
37 Essity Professional Hygiene N.a. LLC
705.6K lbs
38 Blue Ridge Paper Products LLC
703.7K lbs
39 International Paper - Riverdale Mill
682.6K lbs
40 Cabot Corp Canal Plant
679.8K lbs
41 J. R. Simplot Co
677.7K lbs
42 International Paper-Vicksburg Mill
673.3K lbs
43 Usg Paper LLC
656.3K lbs
44 International Paper Riegelwood Mill
623.7K lbs
45 Georgia-Pacific Toledo LLC
604.7K lbs
46 Graphic Packaging International LLC
561.6K lbs
47 Graphic Packaging International LLC
530.2K lbs
48 International Paper Co - Savannah Complex
525.7K lbs
49 Packaging Corp of America
524.6K lbs
50 Perdue Foods LLC - Lewiston Processing Plant
516.2K lbs

Frequently Asked Questions

What is Hydrogen Sulfide in the EPA TRI? ▼
Hydrogen Sulfide (CAS Number: 7783-06-4) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 570 facilities in the United States report releasing this chemical to the EPA.
How much Hydrogen Sulfide is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 424.4M lbs of Hydrogen Sulfide releases to the EPA Toxic Release Inventory across 570 facilities. Release quantities are self-reported estimates covering air, water, land, and off-site transfers. They are disclosure totals, not toxicity-weighted harm scores.
How does EPA TRI classify Hydrogen Sulfide? ▼
Hydrogen Sulfide is not marked as a carcinogen in the TRI classification set. TRI classification flags document inventory listing status; they are not a site-specific exposure or health diagnosis. For health-effect summaries see EPA IRIS and ATSDR toxicological profiles.
Which facilities disclose the most Hydrogen Sulfide? ▼
Dark Horse Treating Facility in NM reports the largest disclosed release of Hydrogen Sulfide in this dataset, at 131.3M lbs. Most reporting facilities for this chemical fall under natural gas processing. Release data is self-reported annually to the EPA under the TRI program. View the full list of 570 facilities on this page.
What is the CAS number for Hydrogen Sulfide? ▼
The CAS (Chemical Abstracts Service) Registry Number for Hydrogen Sulfide is 7783-06-4. CAS numbers are unique numerical identifiers assigned to every chemical substance described in the open scientific literature. This identifier is used to search scientific databases and regulatory filings.

Related Guides

Understanding TRI Data
How the Toxic Release Inventory works
Biggest Polluters in America
Which facilities release the most toxics
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Health Information

Data comes from the EPA Toxic Release Inventory (TRI) program. Release quantities are self-reported by facilities and may represent estimates. The total shown aggregates reports across all facilities and reporting years.

PlainEnviro presents this data without advocacy framing. The presence of a chemical in the TRI database does not by itself indicate a health risk at current exposure levels. For health-related questions about specific chemical exposures, consult your local health agency or a toxicologist.

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Data sourced from the U.S. Environmental Protection Agency (EPA). See our methodology for details. Retrieved and formatted by PlainEnviro

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Toxic Release Inventory (TRI). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.