TRI air releases
TRI air releases at Pennsylvania have more than halved since 2010 (through 2024).
State · TRI 2024
Pennsylvania Pollution
829 TRI facilities, 1,782 public water systems, and 127 Superfund / NPL sites across 62 counties. Statewide TRI releases fell modestly year over year (-5%). Toxic releases concentrations have more than halved since 2010.
FIPS 42 · population 13,002,700 · 67 counties total
Anomaly engine
Notable Signals At The State Level
Total TRI releases
Total TRI releases at Pennsylvania have more than halved since 2010 (through 2024).
TRI land + off-site releases
TRI land + off-site releases at Pennsylvania have more than halved since 2010 (through 2024).
Where the burden sits
County-Level TRI Choropleth
A color-shaded map of pollution data. Darker counties report more pounds of toxic chemicals released to the EPA's Toxics Release Inventory (TRI).
Shaded by total reported releases for 2024. Counties without a published page render as “no TRI data”. Red dots mark this state's top emitters.
Statewide pollutant pathways
Pennsylvania Pollutant Multi-Year Trends
PM2.5 annual mean (NAAQS 9 µg/m³ (annual))Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.
PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have more than halved since 2010.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour))Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour)) concentrations have more than halved since 2010.
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour))Health riskGround-level ozone (smog) forms when vehicle and industrial emissions react in sunlight. Inflames the airways, triggers asthma attacks, and worsens heart and lung disease.
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) concentrations have fallen 21% since 2010.
NO₂ annual mean (NAAQS 53 ppb (annual))Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.
NO₂ annual mean (NAAQS 53 ppb (annual)) concentrations have more than halved since 2010.
Lifetime cancer risk all pollutants (100 in a million (EPA elevated threshold))Health riskEPA-modeled added cancer cases per million residents from a lifetime of breathing local air toxics. EPA flags 100-in-a-million as elevated.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Formaldehyde ambient mean (0.077 µg/m³ (1-in-a-million URE))Health riskAn air toxic emitted by refineries, wood products, and combustion. EPA classifies it as a known human carcinogen — long-term inhalation raises cancer risk.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Benzene ambient mean (0.13 µg/m³ (1-in-a-million URE))Health riskAn air toxic from gasoline, refineries, and tobacco smoke. A known human carcinogen — chronic exposure is linked to leukemia and other blood cancers.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
TRI air releases (5.1 fugitive + 5.2 stack)Health riskToxic chemicals reported by industrial facilities as released into the air — fugitive leaks plus smokestack emissions. Higher pounds means more inhaled exposure for nearby residents.
TRI air releases (5.1 fugitive + 5.2 stack) concentrations have more than halved since 2010.
TRI water releases (5.3)Health riskToxic chemicals reported by industrial facilities as discharged to surface waters (rivers, lakes, the ocean). Affects fishing, recreation, and downstream drinking-water intakes.
TRI water releases (5.3) concentrations have fallen 47% since 2010.
TRI land + off-site releasesHealth riskToxic chemicals released to land on-site or transferred off-site for disposal — landfills, deep-well injection, and similar. Risks groundwater contamination over time.
TRI land + off-site releases concentrations have more than halved since 2010.
Greenhouse gases (GHGRP large emitters, through 2023)Health riskGreenhouse gases reported by large industrial emitters under EPA's GHGRP, in metric tons of CO₂ equivalent. Drives climate warming and the heat-related health effects that follow.
Greenhouse gases (GHGRP large emitters, through 2023) concentrations are roughly unchanged from 2010.
| County | Population | Facilities | Total releases | YoY | Top chemical |
|---|---|---|---|---|---|
| Allegheny CountyFIPS 42003 | 1,245,310 | 45 | 9.0M lb | +7% | Zinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR) |
| Berks CountyFIPS 42011 | 428,483 | 34 | 4.1M lb | +35% | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) |
| Butler CountyFIPS 42019 | 194,562 | 26 | 2.7M lb | -17% | Manganese compoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR) |
| Westmoreland CountyFIPS 42129 | 354,414 | 31 | 2.6M lb | -61% | Manganese And Manganese CompoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR) |
| Schuylkill CountyFIPS 42107 | 143,201 | 15 | 2.2M lb | -10% | Barium And Barium CompoundsHealth riskSoluble barium compounds are toxic if ingested, affecting the heart, kidneys, and nervous system. Insoluble forms (e.g. barium sulfate) are far less toxic. (EPA) |
| York CountyFIPS 42133 | 457,051 | 39 | 1.9M lb | +5% | AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA) |
| Cambria CountyFIPS 42021 | 133,263 | 9 | 1.7M lb | +24% | Barium And Barium CompoundsHealth riskSoluble barium compounds are toxic if ingested, affecting the heart, kidneys, and nervous system. Insoluble forms (e.g. barium sulfate) are far less toxic. (EPA) |
| Montgomery CountyFIPS 42091 | 856,399 | 32 | 1.5M lb | +108% | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) |
| Northampton CountyFIPS 42095 | 314,299 | 24 | 1.5M lb | +18% | AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA) |
| Indiana CountyFIPS 42063 | 83,394 | 4 | 1.4M lb | +30% | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)Health riskAcid mists are an IARC Group 1 carcinogen via inhalation (laryngeal cancer) and corrosive on contact. (IARC) |
| Facility | City | Top chemical | Total releases | YoY |
|---|---|---|---|---|
| Uss Mon Valley Works - Edgar Thomson PlantUS Steel CORP | Braddock | Zinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR) | 4.2M lb | +17% |
| Uss-Clairton PlantUS Steel CORP | Clairton | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) | 3.2M lb | -15% |
| Carpenter Technology CorpCarpenter Technology CORP | Reading | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) | 2.5M lb | +62% |
| Cleveland-Cliffs Steel Corp /Butler WorksCleveland-Cliffs INC | Butler | Manganese compoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR) | 2.3M lb | -6% |
| Conemaugh Generating StationKeystone-Conemaugh Projects LLC | New Florence | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)Health riskAcid mists are an IARC Group 1 carcinogen via inhalation (laryngeal cancer) and corrosive on contact. (IARC) | 1.4M lb | +140% |
| Max Environmental -- Yukon Facility | Yukon | Lead compoundsHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR) | 1.1M lb | -79% |
| Keystone Power PlantKeystone-Conemaugh Projects LLC | Shelocta | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)Health riskAcid mists are an IARC Group 1 carcinogen via inhalation (laryngeal cancer) and corrosive on contact. (IARC) | 1.1M lb | +165% |
| Ati Flat Rolled Products Holdings LLCAti INC | Vandergrift | Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)Health riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA) | 1.1M lb | +28% |
| Colver Green EnergyGeneration Holdings LP | Colver | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)Health riskAerosolized HCl is a corrosive respiratory irritant; chronic exposure damages teeth and respiratory tissue. (NIOSH) | 1.0M lb | +8% |
| Saint Nicholas Cogeneration Project | Shenandoah | Barium And Barium CompoundsHealth riskSoluble barium compounds are toxic if ingested, affecting the heart, kidneys, and nervous system. Insoluble forms (e.g. barium sulfate) are far less toxic. (EPA) | 887k lb | -3% |
Water utilities to watch
Largest Water Systems With Unresolved Health-Based Violations
Sorted to surface utilities serving the most people that still have an active health-based SDWIS violation on the record. Systems in compliance with no unresolved issues fall to the bottom of the ranking.
| Water system | PWSID | Population served | Health-based · 5yr | Status |
|---|---|---|---|---|
| Aqua Pa Main System Private | PA1460073 | 822,600 | 2 | UNRESOLVED |
| York Water Co Private | PA7670100 | 206,762 | 4 | UNRESOLVED |
| Mawc Yough Plant Municipal | PA5260036 | 133,000 | 6 | UNRESOLVED |
| Wilkinsburg-Penn Jt Water Auth Municipal | PA5020056 | 125,000 | 2 | UNRESOLVED |
| Altoona Water Authority Municipal | PA4070023 | 62,500 | 3 | UNRESOLVED |
| Bcwsa Main Lower South Municipal | PA1090079 | 52,621 | 12 | UNRESOLVED |
| Moon Twp Muni Auth Municipal | PA5020011 | 38,000 | 2 | UNRESOLVED |
| Northampton Bucks Co Mun Auth Municipal | PA1090089 | 36,750 | 3 | UNRESOLVED |
| Pottstown Borough Water Auth Municipal | PA1460037 | 36,000 | 6 | UNRESOLVED |
| Chambersburg Boro Water Sys Municipal | PA7280005 | 31,048 | 1 | UNRESOLVED |
Superfund / NPL sites
Federal Cleanup Sites In Pennsylvania
Sites on EPA's Superfund National Priorities List, plus deleted sites whose cleanup objectives EPA has finalized. Federal-facility sites (defense, DOE, etc.) are flagged separately. Each link routes to a per-site page.
| Site | City | Status | Federal facility | Primary contaminant |
|---|---|---|---|---|
| A.I.W. Frank/Mid-County Mustang | Exton | NPL FINAL | No | 1,1-DichloroethaneHealth riskSuspected carcinogen (EPA C/likely); CNS depressant. Common at solvent-contaminated sites as a degradation intermediate. (EPA, ATSDR) |
| Avco Lycoming (Williamsport Division) | Williamsport | NPL FINAL | No | 1,2-Dichloroethene (Cis And Trans Mixture) |
| Baghurst Drive | Harleysville | NPL FINAL | No | 1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR) |
| Bally Ground Water Contamination | Bally | NPL FINAL | No | 1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR) |
| Bell Landfill | Terry Township | NPL FINAL | No | 1,1,1,2-Tetrachloroethane |
| Bendix Flight Systems Division | South Montrose | NPL FINAL | No | Carbon TetrachlorideHealth riskIARC Group 2B possible carcinogen; liver toxic. EPA MCL 5 µg/L. Banned for most uses since 1986. (IARC, EPA) |
| Berks Sand Pit | Longswamp Township | NPL FINAL | No | TetrachloroetheneHealth riskPCE / 'perc'. IARC Group 2A probable carcinogen; central-nervous-system effects; common dry-cleaning solvent and DNAPL plume contaminant. EPA MCL 5 µg/L. (IARC, EPA) |
| Blosenski Landfill | West Caln Township | NPL FINAL | No | AcetoneHealth riskLow chronic toxicity; high acute exposure causes CNS depression and respiratory irritation. (EPA, NIOSH) |
| Boarhead Farms | Bridgeton Township | NPL FINAL | No | Chloroethene (Vinyl Chloride)Health riskIARC Group 1 carcinogen — angiosarcoma of the liver. Final TCE/PCE biodegradation product; commonly found in groundwater plumes. EPA MCL 2 µg/L. (IARC, EPA) |
| Borit Asbestos | Ambler | NPL FINAL | No | AsbestosHealth riskIARC Group 1 carcinogen. Causes mesothelioma, lung cancer, and asbestosis. (IARC, EPA) |
Showing the top 10 sites by status priority. 117 additional NPL-relevant sites in Pennsylvania have entity pages — browse them via the host-county or host-city page rollups.
Equity context · ACS 2018-2022 · USEPA-clone EJ disparity
Statewide Population Characteristics
All Pennsylvania block groups: 13,002,700 residents. Statewide disparity score for pm2.5 (fine particulate) sits below the reference (53). Why we surface this →
State-level percentiles are aggregated from block-group EJScreen data. The EJ pattern within the state will be sharper at the county level — drill down for the meaningful spatial detail.
11.8%
Low-income
25.5%
People of color
5.6%
Under age 5
18.7%
Over age 64
- PM2.5 (fine particulate)Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.49near the national median
- OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.47near the national median
- Nitrogen dioxide (NO₂)Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.41near the national median
- Diesel particulateHealth riskSoot from diesel engines (trucks, trains, ports, construction). EPA classifies it as a likely human carcinogen and a major driver of childhood asthma near freight corridors.55near the national median
- Toxic releases (RSEI)Health riskEPA's Risk-Screening Environmental Indicators score — weights TRI chemical releases by toxicity, where they go, and how many people are nearby. Higher means greater modeled cancer and chronic-health risk.84in the highest 20% nationally
- Traffic proximityHealth riskPopulation-weighted distance to high-volume roads. Living close to heavy traffic raises exposure to PM2.5, NO₂, and diesel exhaust — and the cardiovascular and asthma risks that follow.63above the national median
- Lead-paint risk (pre-1960 housing)Health riskShare of housing built before 1960, when lead-based paint was common. Dust from deteriorating paint is the leading cause of childhood lead poisoning, which permanently impairs cognitive development.76above the national median
- Superfund site proximityHealth riskPopulation-weighted distance to NPL Superfund sites — the most contaminated waste sites in the country. Nearby groundwater, soil, and air can carry industrial solvents, metals, and other long-lived contaminants.79above the national median
- RMP-facility proximityHealth riskDistance to facilities holding chemicals at quantities large enough to require an EPA Risk Management Plan (refineries, fertilizer plants, etc.). These pose acute exposure risk during accidental releases.67above the national median
- Hazardous-waste site proximityHealth riskDistance to RCRA hazardous-waste handlers (treatment, storage, disposal facilities). Indicates potential exposure to industrial chemicals in air, soil, and groundwater.64above the national median
- Underground storage tanksHealth riskDensity of underground tanks (gasoline, heating oil, industrial fluids). Leaking tanks are a leading source of benzene and other volatile organic compounds in groundwater drinking-water supplies.75above the national median
- NPDES wastewater proximityHealth riskDistance to permitted industrial wastewater dischargers. Closer proximity raises exposure to pollutants released into surface waters used for fishing, recreation, and downstream drinking-water intakes.87in the highest 20% nationally
- Drinking-water non-complianceHealth riskEPA score for public water systems with health-based Safe Drinking Water Act violations. Higher means more residents on systems that recently exceeded safe limits for contaminants like lead, arsenic, or nitrate.85in the highest 20% nationally
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 53 | below the reference |
| Ozone | 62 | below the reference |
| Nitrogen dioxide (NO₂) | 51 | below the reference |
| Diesel particulate | 60 | below the reference |
| Toxic releases (RSEI) | 68 | below the reference |
| Traffic proximity | 60 | below the reference |
| Lead-paint risk (pre-1960 housing) | 75 | below the reference |
| Superfund site proximity | 52 | below the reference |
| RMP-facility proximity | 60 | below the reference |
| Hazardous-waste site proximity | 60 | below the reference |
| Underground storage tanks | 63 | below the reference |
| NPDES wastewater proximity | 69 | below the reference |
| Drinking-water non-compliance | 12 | well below the reference |
Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror). EJ disparity scores via the USEPA-clone GitHub mirror after EPA deprecated the public EJScreen tool in 2025; demographics from Census ACS.
Browse
All 62 Pennsylvania Counties With TRI Data
Pollution trends and TRI 2024 pages for every tracked county. Alphabetical.
- Adams County pollution· 1 facility
- Allegheny County pollution· 45 facilities
- Armstrong County pollution· 5 facilities
- Beaver County pollution· 27 facilities
- Bedford County pollution· 8 facilities
- Berks County pollution· 34 facilities
- Blair County pollution· 5 facilities
- Bradford County pollution· 5 facilities
- Bucks County pollution· 38 facilities
- Butler County pollution· 26 facilities
- Cambria County pollution· 9 facilities
- Cameron County pollution· 1 facility
- Carbon County pollution· 7 facilities
- Centre County pollution· 7 facilities
- Chester County pollution· 21 facilities
- Clarion County pollution· 2 facilities
- Clearfield County pollution· 8 facilities
- Clinton County pollution· 3 facilities
- Columbia County pollution· 3 facilities
- Crawford County pollution· 13 facilities
- Cumberland County pollution· 14 facilities
- Dauphin County pollution· 12 facilities
- Delaware County pollution· 11 facilities
- Elk County pollution· 19 facilities
- Erie County pollution· 42 facilities
- Fayette County pollution· 3 facilities
- Franklin County pollution· 11 facilities
- Fulton County pollution· 2 facilities
- Greene County pollution· 1 facility
- Huntingdon County pollution· 2 facilities
- Indiana County pollution· 4 facilities
- Jefferson County pollution· 10 facilities
- Juniata County pollution· 2 facilities
- Lackawanna County pollution· 8 facilities
- Lancaster County pollution· 50 facilities
- Lawrence County pollution· 11 facilities
- Lebanon County pollution· 15 facilities
- Lehigh County pollution· 19 facilities
- Luzerne County pollution· 30 facilities
- Lycoming County pollution· 15 facilities
- McKean County pollution· 11 facilities
- Mercer County pollution· 28 facilities
- Mifflin County pollution· 3 facilities
- Monroe County pollution· 7 facilities
- Montgomery County pollution· 32 facilities
- Montour County pollution· 3 facilities
- Northampton County pollution· 24 facilities
- Northumberland County pollution· 11 facilities
- Philadelphia County pollution· 19 facilities
- Potter County pollution· 1 facility
- Schuylkill County pollution· 15 facilities
- Snyder County pollution· 3 facilities
- Somerset County pollution· 3 facilities
- Tioga County pollution· 3 facilities
- Union County pollution· 4 facilities
- Venango County pollution· 13 facilities
- Warren County pollution· 5 facilities
- Washington County pollution· 23 facilities
- Wayne County pollution· 1 facility
- Westmoreland County pollution· 31 facilities
- Wyoming County pollution· 1 facility
- York County pollution· 39 facilities
Sources.
- EPA Toxics Release Inventory · retrieved 2026-05-07.