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EPA TRI Chemical

Pentachlorobenzene

CAS Number: 608-93-5

Total releases
4.4K lbs
Number of facilities
27
Carcinogen
No
PBT substance
Yes
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PBT

According to the EPA Toxics Release Inventory, Pentachlorobenzene (CAS 608-93-5) is disclosed by 27 Form R facilities totaling 4.4K lbs of reported releases. It is also listed as a persistent bioaccumulative toxicant (PBT) in the TRI extract. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Pentachlorobenzene (CAS 608-93-5) 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 PBT (persistent, bioaccumulative, toxic) status above carries a lower TRI reporting threshold than most listed chemicals, reflecting elevated regulatory concern about long-term environmental buildup. The largest individual disclosure in the current dataset comes from CHEMOURS JOHNSONVILLE PLANT in TN at 2.1K 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

Pentachlorobenzene: how the 4.4K lbs splits

4.4K lbs across all reported pathways

  • Land Disposal3.8K lbs86.6%
  • Water Discharges418 lbs9.6%
  • Air Releases141 lbs3.2%
  • Off-site Transfers29 lbs0.7%

Pentachlorobenzene's 4.4K lbs Form-R total is LAND, with land disposal making up 86.6% of the bar. Next segment: water discharges at 9.6%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Pentachlorobenzene releases across all reporting facilities increased by 24% (574 lbs → 714 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Pentachlorobenzene is concentrated: Tennessee accounts for 48.0% of the reported total (1 facility). Next: Mississippi.

  • Tennessee 2.1K lbs
  • Mississippi 1.3K lbs
  • Texas 632 lbs
  • Alabama 165 lbs
  • Arkansas 138 lbs
Industry Sources

Reporting for Pentachlorobenzene is highly concentrated by industry: Chemicals facilities account for 80.3% of the reported total (10 facilities). Next: Hazardous Waste.

  • Chemicals 3.5K lbs
  • Hazardous Waste 455 lbs
  • Petroleum 404 lbs
  • Electric Utilities 2 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Chemours Johnsonville Plant
2.1K lbs
2 Chemours Delisle Plant
1.3K lbs
3 Flint Hills Resources Corpus Christi LLC - West Plant
305 lbs
4 Chemical Waste Management
165 lbs
5 Elemental Environmental Solutions LLC
138 lbs
6 Dow Chemical Co Freeport Facility
115 lbs
7 Flint Hills Resources Corpus Christi LLC - East Plant
99 lbs
8 Tm Deer Park Services LP
83 lbs
9 Vickery Environmental Inc.
37 lbs
10 Freeport_olin Bc
29 lbs
11 Wayne Disposal Inc
28 lbs
12 The Dow Chemical Co - Louisiana Operations
8 lbs
13 The Dow Chemical Co
3 lbs
14 Westlake US 2 LLC
2 lbs
15 Veolia N.a. Inc.
1 lbs
16 Clean Harbors Deer Park LLC
1 lbs
17 Veolia Es Technical Solutions LLC Port Arthur Facility
1 lbs
18 Clean Harbors el Dorado LLC
1 lbs
19 Clean Harbors Environmental Services Inc
0 lbs
20 Westlake Vinyls Inc
0 lbs
21 Clean Harbors Aragonite LLC
0 lbs
22 Heritage Thermal Services
0 lbs
23 Chemical & Metal Industries Inc
0 lbs
24 Arcwood Environmental - Orange LLC
0 lbs
25 Blue Cube Operations LLC - Plaquemine Site
0 lbs
26 Westlake Chemicals & Vinyls LLC
0 lbs
27 Ross Incineration Services Inc
0 lbs

Frequently Asked Questions

What is Pentachlorobenzene in the EPA TRI? ▼
Pentachlorobenzene (CAS Number: 608-93-5) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. It is classified as a persistent bioaccumulative toxicant (PBT) in the TRI extract. 27 facilities in the United States report releasing this chemical to the EPA.
How much Pentachlorobenzene is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 4.4K lbs of Pentachlorobenzene 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 Pentachlorobenzene? ▼
Pentachlorobenzene is not marked as a carcinogen in the TRI classification set. It is also listed as a persistent bioaccumulative toxicant (PBT), which uses lower TRI reporting thresholds. 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 Pentachlorobenzene? ▼
Chemours Johnsonville Plant in TN reports the largest disclosed release of Pentachlorobenzene in this dataset, at 2.1K 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 Pentachlorobenzene? ▼
The CAS (Chemical Abstracts Service) Registry Number for Pentachlorobenzene is 608-93-5. 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

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How to Check Environmental Quality
Step-by-step guide to checking your local environment

Health Information

Persistent Bioaccumulative Toxicant (PBT): This chemical is classified as a PBT by the EPA. PBT chemicals are toxic, persist in the environment, and bioaccumulate in food chains. Because of these properties, even relatively small releases can pose a significant threat to human health and the environment over time.

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.