PlainEnviro

EPA TRI Chemical

Thiourea

CAS Number: 62-56-6

Total releases
164.6K lbs
Number of facilities
33
Carcinogen
Yes
PBT substance
No
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Carcinogen

According to the EPA Toxics Release Inventory, Thiourea (CAS 62-56-6) is disclosed by 33 Form R facilities totaling 164.6K 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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Thiourea (CAS 62-56-6) 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 CHEMICAL WASTE MANAGEMENT in AL at 83.0K 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

Thiourea: how the 164.6K lbs splits

164.6K lbs across all reported pathways

  • Land Disposal116.9K lbs71.0%
  • Off-site Transfers31.3K lbs19.0%
  • Air Releases16.4K lbs10.0%

Thiourea's 164.6K lbs Form-R total is LAND, with land disposal making up 71.0% of the bar. Next segment: off-site transfers at 19.0%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Thiourea releases across all reporting facilities increased by 174% (19.4K lbs → 53.3K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Thiourea is highly concentrated: Alabama accounts for 50.4% of the reported total (1 facility). Next: Minnesota.

  • Alabama 83.0K lbs
  • Minnesota 29.5K lbs
  • Texas 20.9K lbs
  • Illinois 14.5K lbs
  • Utah 10.3K lbs
Industry Sources

Reporting for Thiourea is highly concentrated by industry: Hazardous Waste facilities account for 74.0% of the reported total (10 facilities). Next: Primary Metals.

  • Hazardous Waste 121.9K lbs
  • Primary Metals 24.8K lbs
  • Miscellaneous Manufacturing 14.3K lbs
  • Chemicals 3.5K lbs
  • Nonmetallic Mineral Product 141 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Chemical Waste Management
83.0K lbs
2 Tm Deer Park Services LP
18.7K lbs
3 Evoqua Water Technologies LLC
15.2K lbs
4 Rock River Fabrication
14.5K lbs
5 Boston Scientific Weaver Lake Campus
14.3K lbs
6 Kennecott Utah Copper Smelter & Refinery
10.3K lbs
7 Elemental Environmental Solutions LLC
4.9K lbs
8 Waxahachie - Powder (dr)
1.9K lbs
9 Chemdesign Products Inc
1.1K lbs
10 Hexion Inc - Morganton Facility
308 lbs
11 Oilfield Solutions Inc
167 lbs
12 Norlite LLC
121 lbs
13 Veolia Es Technical Solutions LLC Port Arthur Facility
38 lbs
14 Keystone Cement Co
20 lbs
15 Columbus Chemical Industries Inc. Employee Stock Ownership P
10 lbs
16 Ambit Chemical Technologies
1 lbs
17 Heritage Thermal Services
1 lbs
18 Arcwood Environmental - Orange LLC
0 lbs
19 Clean Harbors el Dorado LLC
0 lbs
20 Clean Harbors Aragonite LLC
0 lbs
21 Clean Harbors Deer Park LLC
0 lbs
22 Syntech Cedar Port
0 lbs
23 Baker Petrolite Bayport Facili Ty
0 lbs
24 Pogo Mine
0 lbs
25 Brenntag Pacific Inc
0 lbs
26 Thatcher Co
0 lbs
27 Phelps Dodge Copper Products Co
0 lbs
28 Nalco Fresno Facility
0 lbs
29 Sterling Specialty Chemicals LLC
0 lbs
30 Hydrite Chemical Co.
0 lbs
31 Wego Chemical Group
0 lbs
32 Rsa Corp
0 lbs
33 Connoisseurs Products Corp
0 lbs

Frequently Asked Questions

What is Thiourea in the EPA TRI? ▼
Thiourea (CAS Number: 62-56-6) 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. 33 facilities in the United States report releasing this chemical to the EPA.
How much Thiourea is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 164.6K lbs of Thiourea releases to the EPA Toxic Release Inventory across 33 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 Thiourea? ▼
Thiourea 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 Thiourea? ▼
Chemical Waste Management in AL reports the largest disclosed release of Thiourea in this dataset, at 83.0K lbs. Most reporting facilities for this chemical fall under hazardous waste. Release data is self-reported annually to the EPA under the TRI program. View the full list of 33 facilities on this page.
What is the CAS number for Thiourea? ▼
The CAS (Chemical Abstracts Service) Registry Number for Thiourea is 62-56-6. 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
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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.