EPA TRI Facility · Electric Utilities
Mystic Station
Charlestown, MA · Parent: Constellation Energy Generation LLC
- Total releases
- 46.4K lbs
- Chemicals reported
- 4
- Carcinogens
- 2
- Primary pathway
- Air Releases
AIR Form-R mix
Mystic Station: how the 46.4K lbs splits
46.4K lbs across all reported pathways
- Air Releases 46.2K lbs 99.6%
- Water Discharges 115 lbs 0.2%
- Off-site Transfers 77 lbs 0.2%
Mystic Station's 46.4K lbs Form-R total is AIR - air releases is 99.6% of the bar. Next segment: water discharges at 0.2%. Leading chemical by pounds: Ammonia.
Carcinogen-classified pounds vs other reported pounds
Same cumulative TRI total as above, split by EPA/IARC carcinogen classification on each chemical: pounds share, not chemical count. Classification is not a site health-risk score.
LIGHT volume AIR pathway TRACE-CARC
Mystic Station is an EPA Toxics Release Inventory reporter in Charlestown, MA, in the electric utilities sector. It reported 9.5K lbs of releases across 3 chemicals in 2021, and 46.4K lbs in total across its 2019-2021 reporting years. That ranks 6,283 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. In Massachusetts's 373 reporting TRI sites, pounds #1 is not chemical-count #1. Mystic Station is pounds #64 and chemical-count #71 at 46.4K lbs. Solutia Inc leads reported pounds (2.5M lbs) at 9 chemicals (chemical-count #10). Astro Chemicals Inc leads chemical count at 17 chemicals (5.9K lbs, pounds #154). Pounds reported are not a measure of toxicity or health risk. Nearest other TRI reporters: Holcim - Ner Inc.; Exxon Mobil Corp Everett Terminal; Boston Sand & Gravel - Charlestown Plant & Garage; Dampney Co Inc. Similar-scale Electric Utilities peers outside Massachusetts: Bayswater Peaking Facility LLC; Pseg Power Connecticut LLC Bridgeport Harbor Station; Kleen Energy Systems LLC; Gainesville Regional Utilities Deerhaven Generating Station. Other Constellation Energy Generation LLC sites in this extract: Perryman Generating Station. Largest disclosed chemicals by pounds: Ammonia; Polycyclic aromatic compounds; Benzo[g,h,i]perylene; Naphthalene.
Compare Mystic Station with
Nearest reporters in Massachusetts
- Holcim - Ner Inc. Everett · 2 lbs
- Exxon Mobil Corp Everett Terminal Everett · 20.7K lbs
- Boston Sand & Gravel - Charlestown Plant & Garage Charlestown · 222 lbs
- Dampney Co Inc Everett · 48.8K lbs
Similar-scale Electric Utilities sites elsewhere: Bayswater Peaking Facility LLC (NY) · Pseg Power Connecticut LLC Bridgeport Harbor Station (CT) · Kleen Energy Systems LLC (CT)
Mystic Station stamps LIGHT volume with a dominant AIR pathway (99.6% air releases) across 4 chemicals · 2 carcinogen-classified. Cumulative Form-R extract: 46.4K lbs (2019–2021). All figures are self-reported EPCRA §313 estimates, not measured stack emissions or a health-risk score. Scale peers include Bayswater Peaking Facility LLC and Pseg Power Connecticut LLC Bridgeport Harbor Station.
Mystic Station vs. every reporting TRI facility
Cumulative reported release pounds, with this facility marked in the national distribution
46K lbs Top 24% higher than 76% of 25,986 reporting TRI facilities
Each bar is a $1M-wide band; taller bars hold more reporting TRI facilities. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
Mystic Station: Ammonia-led volume
Among the 513 Electric Utilities facilities in this database, Mystic Station reports the 346th-largest volume (46.4K lbs). Its reported volume is concentrated rather than spread: Ammonia alone is more than 99.9% of the total. Scale peers outside Massachusetts include Bayswater Peaking Facility LLC and Pseg Power Connecticut LLC Bridgeport Harbor Station.
Concentrated means ≥60% of Mystic Station's pounds in one chemical - here Ammonia at more than 99.9%. Not a toxicity score.
Mystic Station Form-R facts
Compare this facility
See how Mystic Station stacks up against nearby facilities and the typical reporter.
23201.2× more than the comparison
33% more than the comparison
Comparison reflects reported pounds and chemical counts, not toxicity or health risk. Averages cover facilities reporting any release.
How does this facility release toxic chemicals?
How Mystic Station releases toxic chemicals into the environment. Total: 46.4K lbs.
Emissions Trend Summary
From 2019 to 2021, total releases decreased by 54% (20.8K lbs to 9.5K lbs).
Mystic Station: annual Form-R pounds
LIGHT site · AIR pathway · TRI years 2019–2021
- 2019 0
- 2020 0
- 2021 0
What this shows Mystic Station year-over-year reported totals (decreased by 54% from 2019 to 2021). TRI figures are self-reported estimates and can swing with production, waste handling, and reporting changes, not only with controls. Lead chemical in the extract: Ammonia.
| Year | Total | Chemicals |
|---|---|---|
| 2019 | 20.8K lbs | 4 |
| 2020 | 16.2K lbs | 3 |
| 2021 | 9.5K lbs | 3 |
Chemical Releases
Aggregated across all reporting years (2019–2021). 2 of 4 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Ammonia | 46.4K lbs | - |
| Polycyclic aromatic compounds | 32 lbs | Carcinogen |
| Benzo[g,h,i]perylene | 1 lbs | - |
| Naphthalene | 0 lbs | Carcinogen |
Mystic Station · AIR-pathway site
Nearest TRI Facilities to Mystic Station
Closest other reporters in Massachusetts - including Holcim - Ner Inc., Exxon Mobil Corp Everett Terminal, Boston Sand & Gravel - Charlestown Plant & Garage, ordered by distance.
Showing 8 of 372 other reporting facilities in Massachusetts.
Similar Electric Utilities Facilities
Other Electric Utilities facilities with similar total release volumes (±80%), outside Massachusetts - e.g. Bayswater Peaking Facility LLC, Pseg Power Connecticut LLC Bridgeport Harbor Station, Kleen Energy Systems LLC.
Compare beyond Massachusetts
Nationwide peers by reported pounds & chemical count
Cross-state TRI reporters nearest Mystic Station on cumulative reported pounds (46.4K lbs) and distinct chemical count (4). Release-pound peers include Heidelberg Materials US Cement LLC, Primary Packaging Inc (0679000276), Molded Plastic Industries Inc. Chemical-count peers include Hamilton Sundstrand de Puerto Rico Inc., Abb Installation Products Caribe LLC, Cooley Inc. Neighborhoods are forced disjoint so each axis surfaces a different set of sites.
Similar reported release pounds
Nearest out-of-state reporters (≥1,000 lbs) by absolute TRI pounds, not same-industry or same-county neighbors.
- Heidelberg Materials US Cement LLC Mason City, IA · Nonmetallic Mineral Product 46.4K lbs reported
- Primary Packaging Inc (0679000276) Bolivar, OH · Plastics and Rubber 46.4K lbs reported
- Molded Plastic Industries Inc Holt, MI · Transportation Equipment 46.4K lbs reported
- Parker Hannifin Corp Huntsville, AL · Fabricated Metals 46.4K lbs reported
Similar chemical count
Nearest out-of-state reporters by distinct Form-R chemicals (deduped against the release-pound neighborhood).
- Hamilton Sundstrand de Puerto Rico Inc. Santa Isabel, PR · Transportation Equipment 4 chemicals
- Abb Installation Products Caribe LLC Vega Baja, PR · Electrical Equipment 4 chemicals
- Cooley Inc Pawtucket, RI · Textiles 4 chemicals
- Manchester Street Llc. Providence, RI · Electric Utilities 4 chemicals
Other Constellation Energy Generation LLC Facilities
Same-parent TRI sites ranked by reported releases - including Perryman Generating Station.
About TRI Data
Data as of 2023 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
On this page the largest disclosed chemicals include Ammonia, Polycyclic aromatic compounds, Benzo[g,h,i]perylene, Naphthalene; nearby reporters include Holcim - Ner Inc.. Mystic Station stamps LIGHT volume · AIR pathway · TRACE-CARC carcinogen-lbs on this Form-R extract. Totals are self-reported estimates under EPCRA §313, not measured stack emissions or a health-risk score.
Use and verify this record
This Mystic Station TRI extract (LIGHT · AIR · TRACE-CARC · lead Ammonia) joins EPA Form-R filings with facility identity - reported pounds, not a health-risk rating.
Mystic Station totals are self-reported EPCRA §313 estimates for Charlestown, MA, latest year 2021. Form-R rows span 2019–2021 (3 years). NAICS 221112 · Electric Utilities. 18.3% of Suffolk TRI pounds in this extract. Nearest ABS peer: Heidelberg Materials US Cement LLC (Δ 2 lbs). Pounds ≠ exposure.
Mystic Station stamps LIGHT volume · AIR pathway · TRACE-CARC · lead Ammonia. PlainEnviro renders this EPA Form-R extract from its pipeline; no figure is typed in by an editor. Corrections: editorial policy.
All federal data sources used on this page
- EPA Toxics Release Inventory (TRI) Basic Data Files - annual self-reported chemical-release filings. epa.gov
- EPA TRI Program reference - how chemicals and reported releases are counted. epa.gov
- EPA Facility Registry Service - facility location and identity. epa.gov
- EPA ECHO - regulatory and compliance context. epa.gov
- EPA Envirofacts - the EPA data warehouse exposing these datasets. epa.gov