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EPA TRI Chemical

Dimethyl Sulfate

CAS Number: 77-78-1

Total releases
11.2K lbs
Number of facilities
27
Carcinogen
Yes
PBT substance
No
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Carcinogen

According to the EPA Toxics Release Inventory, Dimethyl Sulfate (CAS 77-78-1) is disclosed by 27 Form R facilities totaling 11.2K lbs of reported releases. The TRI extract marks this chemical with a carcinogen classification flag. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Dimethyl Sulfate (CAS 77-78-1) 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.

The carcinogen flag above reflects an assessment from EPA, the International Agency for Research on Cancer, or the National Toxicology Program, not a TRI-specific determination. The largest individual disclosure in the current dataset comes from STEPAN CO MILLSDALE ROAD in IL at 8.4K 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.

AIR pathway mix

Dimethyl Sulfate: how the 11.2K lbs splits

11.2K lbs across all reported pathways

  • Air Releases11.2K lbs99.7%
  • Water Discharges35 lbs0.3%
  • Off-site Transfers0 lbs<0.1%
  • Land Disposal0 lbs<0.1%

Dimethyl Sulfate's 11.2K lbs Form-R total is AIR, with air releases making up 99.7% of the bar. Next segment: water discharges at 0.3%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Dimethyl Sulfate releases across all reporting facilities decreased by 59% (1.2K lbs → 511 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Dimethyl Sulfate is highly concentrated: Illinois accounts for 75.4% of the reported total (2 facilities). Next: Georgia.

  • Illinois 8.4K lbs
  • Georgia 1.3K lbs
  • Pennsylvania 422 lbs
  • West Virginia 395 lbs
  • Wisconsin 231 lbs
Industry Sources

Reporting for Dimethyl Sulfate is highly concentrated by industry: Chemicals facilities account for 99.8% of the reported total (22 facilities). Next: Hazardous Waste.

  • Chemicals 11.2K lbs
  • Hazardous Waste 20 lbs
  • Nonmetallic Mineral Product 0 lbs

Which facilities release the most of this chemical?

Facilities with the largest reported releases of Dimethyl Sulfate. Up to 50 shown.

# Facility Release (lbs)
1 Stepan Co Millsdale Road
8.4K lbs
2 Stepan Co
1.3K lbs
3 Croda Inc
422 lbs
4 Chemours Belle Plant
395 lbs
5 Evonik Industries
231 lbs
6 Bayer Cropscience LP - Kc
92 lbs
7 Basf Corp - Hannibal Site
60 lbs
8 Chemtrade Refinery Solutions LP
50 lbs
9 Iofina Chemical Inc.
50 lbs
10 3M Chemical Operations' Cordova Facility
45 lbs
11 Eco-Services Operations
44 lbs
12 Lycus Ltd
40 lbs
13 Piedmont Chemical Industries I LLC
26 lbs
14 Veolia Es Technical Solutions LLC Port Arthur Facility
19 lbs
15 Mpm Silicones LLC
15 lbs
16 Pharmacia & Upjohn Co LLC a Subsidiary of Pfizer Inc
12 lbs
17 Clean Harbors el Dorado LLC
1 lbs
18 Ross Incineration Services Inc
0 lbs
19 Heritage Thermal Services
0 lbs
20 Norlite LLC
0 lbs
21 Buckman Laboratories Inc.
0 lbs
22 Abitec Corp Janesville Plant
0 lbs
23 Dow Silicones Corp
0 lbs
24 Chemtall Incorporated; Flocryl LLC
0 lbs
25 Archroma US Inc
0 lbs
26 Weylchem US Inc.
0 lbs
27 Dystar LP
0 lbs

Frequently Asked Questions

What is Dimethyl Sulfate in the EPA TRI? ▼
Dimethyl Sulfate (CAS Number: 77-78-1) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. The TRI extract marks it with a carcinogen classification flag based on EPA/IARC/NTP listings. 27 facilities in the United States report releasing this chemical to the EPA.
How much Dimethyl Sulfate is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 11.2K lbs of Dimethyl Sulfate releases to the EPA Toxic Release Inventory across 27 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 Dimethyl Sulfate? ▼
Dimethyl Sulfate carries a carcinogen classification flag in the TRI database (drawn from EPA, IARC, or NTP listings). 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 Dimethyl Sulfate? ▼
Stepan Co Millsdale Road in IL reports the largest disclosed release of Dimethyl Sulfate in this dataset, at 8.4K lbs. Most reporting facilities for this chemical fall under chemicals. Release data is self-reported annually to the EPA under the TRI program. View the full list of 27 facilities on this page.
What is the CAS number for Dimethyl Sulfate? ▼
The CAS (Chemical Abstracts Service) Registry Number for Dimethyl Sulfate is 77-78-1. 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

Carcinogen Classification: This chemical is classified as a known or suspected carcinogen by the EPA under the Toxic Release Inventory program. This classification is based on evaluations by agencies including the International Agency for Research on Cancer (IARC), the National Toxicology Program (NTP), and the EPA itself.

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.