Monument Chemical LLC
4 facilities · 1 state · 3.5M lbs total releases
According to the EPA Toxics Release Inventory, Monument Chemical LLC is the reported parent of 4 Form R facilities across 1 state, disclosing 3.5M lbs of toxic releases. 12 of 55 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is Texas (3.5M lbs). Those TRI figures remain self-reported disclosure pounds for Monument Chemical LLC, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Monument Chemical LLC: EPA TRI 2023 reporting year
Same facilities, both years
+13.4%
4 facilities that filed in 2022 and 2023
Whole inventory
+13.4%
141.8 thousand lb → 160.8 thousand lb, every facility that filed
- Monument Chemical LLC's total reported releases rose from 141.8 thousand lb in 2022 to 160.8 thousand lb in 2023, based on EPA TRI filings.
- Monument Chemical LLC's water releases fell from 410 lb in 2022 to 320 lb in 2023, based on EPA TRI filings.
- Monument Chemical LLC's off-site transfers rose from 115.1 thousand lb in 2022 to 136.4 thousand lb in 2023, based on EPA TRI filings.
- Monument Chemical LLC's air releases fell from 26.3 thousand lb in 2022 to 24.1 thousand lb in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Monument Chemical LLC from filing to facility
Largest Form R sites under this parent: Monument Chemical Port Arthur LLC; Monument Chemical Houston LLC; Monument Chemical Bayport LLC; Monument Chemical Baytown LLC. Neighbor parents on the disclosure ladder: Targa Resources Corp; Ineos US I Inc. Largest disclosed chemicals by pounds: Methanol; Isobutyraldehyde; Ethylene glycol; n-Butyl alcohol; Naphthalene. Heaviest-reporting states in this extract: Texas. Industry labels on the parent rollup: Chemicals. Start from those named sites and neighbors rather than a generic parent blurb; pounds stay disclosure, not risk.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files Toxics Release Inventory (TRI) · August 2026
Largest Form R sites under this parent: Monument Chemical Port Arthur LLC; Monument Chemical Houston LLC; Monument Chemical Bayport LLC; Monument Chemical Baytown LLC. Neighbor parents on the disclosure ladder: Targa Resources Corp; Ineos US I Inc. Largest disclosed chemicals by pounds: Methanol; Isobutyraldehyde; Ethylene glycol; n-Butyl alcohol; Naphthalene. Heaviest-reporting states in this extract: Texas. Industry labels on the parent rollup: Chemicals.
Monument Chemical LLC ranks #327 of 4,988 slug-merged TRI parents, a smaller disclosed-volume parent relative to the national Form R parent set. Monument Chemical LLC's TRI Form R footprint is concentrated in a single state (Texas), so statewide context matters more than a multi-state portfolio read. Releases are facility-concentrated: Monument Chemical Port Arthur LLC accounts for most of Monument Chemical LLC's disclosed pounds, so peer comparisons should weight that site, not an even portfolio average.
Parent aggregation for Monument Chemical LLC follows facility-reported names. Compare the named neighbors (Targa Resources Corp; Ineos US I Inc) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Monument Chemical LLC sits among TRI parents
Monument Chemical LLC sits on a disclosure ladder beside Targa Resources Corp and Ineos US I Inc. Open those parents for a different facility count, state span, and chemical mix.
Higher disclosed volume
- Targa Resources Corp · rank #325 · 105.5M lbs
- Ineos US I Inc · rank #326 · 94.2M lbs
Largest chemicals disclosed by Monument Chemical LLC
Methanol; Isobutyraldehyde; Ethylene glycol; n-Butyl alcohol; Naphthalene lead the Form R pound rollup for this parent, including filings such as Monument Chemical Port Arthur LLC. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Methanol | 2.7M lbs |
| Isobutyraldehyde | 447.0K lbs |
| Ethylene glycol | 136.1K lbs |
| n-Butyl alcohol | 88.8K lbs |
| Naphthalene | 24.7K lbs |
Facilities (4)
| Facility | Releases |
|---|---|
| Monument Chemical Port Arthur LLC Port Arthur, TX | 2.9M lbs |
| Monument Chemical Houston LLC Houston, TX | 522.2K lbs |
| Monument Chemical Bayport LLC Pasadena, TX | 132.3K lbs |
| Monument Chemical Baytown LLC Baytown, TX | 27.4K lbs |
Frequently Asked Questions
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Compare beyond the release ladder
Nationwide peers by disclosed pounds & facility count
Cross-portfolio TRI parents nearest Monument Chemical LLC on total disclosed release pounds (3.5M lbs) and reporting facility count (4). Release-volume peers include Alpek Polyester USA LLC, Olin Corp, Aurorium Ppc Holdings LLC. Facility-count peers include A Stucki Holding Corp, Advanced Heat Treat Corp, Alleima USA LLC. Neighborhoods are forced disjoint so each axis surfaces a different set of parents.
Similar disclosed release pounds
Nearest parents (≥3 facilities, ≥10k lbs) by absolute TRI disclosed pounds, not rank-adjacent ladder neighbors.
Similar facility count
Nearest parents by reporting-site count (deduped against the release-pound neighborhood).
About This Data
EPA TRI parent totals cover all media. This extract's heaviest states for the parent are Texas; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Monument Chemical LLC's TRI parent record
From Monument Chemical LLC, open Monument Chemical Port Arthur LLC or compare against Targa Resources Corp rather than reading rank alone.
- Open the largest Form R site for Monument Chemical LLC (Monument Chemical Port Arthur LLC in TX). Largest facility
- Compare against Ineos US I Inc, the next-higher disclosed-volume parent. Higher-volume parent
- Browse the full parent release ranking to see where Monument Chemical LLC sits among all slug-merged TRI parents. All parent companies
Rank and peers (Targa Resources Corp, Ineos US I Inc) are disclosure volume only, not toxicity-weighted risk or enforcement status.
Use and verify this record
Monument Chemical LLC's record groups disclosed TRI parent-company filings so readers can compare reporting context without treating the total as a measure of risk.
Company release figures are computed directly from EPA Toxic Release Inventory data; source names and the record-linking method are documented in the methodology.
Primary sources
- EPA Toxics Release Inventory Basic Data Files - annual facility-level chemical-release disclosures
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.