Pollution Analyst
How it works→
State · TRI 2024

Indiana Pollution

722 TRI facilities, 718 public water systems, and 54 Superfund / NPL sites across 83 counties. Statewide TRI releases rose modestly year over year (+12%). Toxic releases concentrations have fallen 30% since 2010.

FIPS 18 · population 6,785,528 · 92 counties total

Top counties Top facilitiesPathwaysEquity context
PM2.5 ANNUAL MEAN (NAAQS 9 ΜG/M³ (ANNUAL)) · 2010–2024
Bar chart of annual values from 2010 to 2024, in µg/m³. Most recent year (2024): 8 µg/m³.16 µg/m³'10'12'14'16'18'20'22'248 µg/m³
Anomaly engine

Notable Signals At The State Level

LONG-ARC IMPROVEMENT · LONG-ARC SHIFT

TRI water releases

TRI water releases at Indiana 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.

STYLE
TRI total releases (lbs/yr)
LOW → HIGH
Statewide pollutant pathways

Indiana Pollutant Multi-Year Trends

CRITERIA AIRSINCE 2010

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.

7.62 µg/m³ · -21% YoY · -51% since 2010

PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have more than halved since 2010.

CRITERIA AIRSINCE 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.

16.61 µg/m³ · -40% YoY · -51% since 2010

PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour)) concentrations have more than halved since 2010.

CRITERIA AIRSINCE 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.

0.065 ppm · -10% YoY · -20% since 2010

Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) concentrations have fallen 20% since 2010.

CRITERIA AIRSINCE 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.

6.4 ppb · -2% YoY · -59% since 2010

NO₂ annual mean (NAAQS 53 ppb (annual)) concentrations have more than halved since 2010.

HAZARDOUS AIR2020 VINTAGE

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.

27.7 per million · 2020 vintage

Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.

HAZARDOUS AIR2020 VINTAGE

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.

1.37 µg/m³ · 2020 vintage

Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.

HAZARDOUS AIR2020 VINTAGE

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.

0.16 µg/m³ · 2020 vintage

Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.

TRI AIRSINCE 2010

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.

27.1M lb · +25% YoY · -43% since 2010

TRI air releases (5.1 fugitive + 5.2 stack) concentrations have fallen 43% since 2010.

TRI WATERSINCE 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.

10.1M lb · -10% YoY · -71% since 2010

TRI water releases (5.3) concentrations have more than halved since 2010.

TRI LANDSINCE 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.

77.5M lb · +11% YoY · -5% since 2010

TRI land + off-site releases concentrations are roughly unchanged from 2010.

GHGSINCE 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.

247M metric tons CO₂e · -3% YoY · -11% since 2010

Greenhouse gases (GHGRP large emitters, through 2023) concentrations have fallen 11% since 2010.

Top counties · TRI 2024

Indiana Counties With Most Chemical Releases

Methodology →

CountyPopulationFacilitiesTotal releasesYoYTop chemical
Lake CountyFIPS 18089497,6824033.0M lb+47%Manganese And Manganese CompoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR)
Cass CountyFIPS 1801737,820914.5M lb+56%Zinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR)
Porter CountyFIPS 18127173,3551710.9M lb+19%Manganese And Manganese CompoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR)
Marion CountyFIPS 18097971,737518.9M lb+21%Lead And Lead CompoundsHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)
Spencer CountyFIPS 1814719,93548.5M lb-12%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)
Posey CountyFIPS 1812925,22683.4M lb-31%Sodium nitrite
Gibson CountyFIPS 1805133,00653.4M lb+17%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)
Warrick CountyFIPS 1817364,06532.8M lb-8%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)
Perry CountyFIPS 1812319,18612.4M lb-4%Zinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR)
Tippecanoe CountyFIPS 18157186,955202.0M lb-5%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)
Top facilities · TRI 2024

The Largest Individual Emitters In Indiana

Methodology →

FacilityCityTop chemicalTotal releasesYoY
Uss Gary WorksUS Steel CORPGaryManganese And Manganese CompoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR)19.2M lb+47%
Waelz Sustainable Products LLCLogansportZinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR)14.3M lb+58%
Cleveland-Cliffs Burns Harbor LLCCleveland-Cliffs INCBurns HarborManganese And Manganese CompoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR)10.4M lb+21%
Bp Products Na Whiting Business UnitBp America INCWhitingXylene (mixed isomers)Health riskEye, skin, and respiratory irritant; central-nervous-system effects from chronic exposure. (EPA)8.6M lb+343%
Cleveland-Cliffs Steel Corp (Rockport Works )Cleveland-Cliffs INCRockportNitrate 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)7.1M lb-19%
Heritage Environmental Services LLCHeritage Environmental Services INCIndianapolisNickelHealth riskNickel compounds are IARC Group 1 carcinogens; inhalation exposure raises lung and nasal cancer risk. (IARC)5.5M lb+19%
Gibson Generating StationDuke Energy CORPOwensvilleSulfuric 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)3.2M lb+20%
Ecobat Resources Indiana LLCEcobat LLCIndianapolisLead And Lead CompoundsHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)3.0M lb+33%
Sabic Innovative Plastics Mt. Vernon LLCSabic US Holdings LPMount VernonSodium nitrite2.8M lb-29%
Waupaca Foundry-Plant 5Monomoy Capital Partners LLCTell CityZinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR)2.4M lb-4%
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.

Methodology →

Water systemPWSIDPopulation servedHealth-based · 5yrStatus
Fort Wayne - 3 Rivers Filtration Plant MunicipalIN5202020269,9943UNRESOLVED
Hammond Water Works Department MunicipalIN524502078,3842UNRESOLVED
Anderson Water Department MunicipalIN524800255,2124UNRESOLVED
City Of Lawrence Utilities MunicipalIN524900549,0006UNRESOLVED
Laporte Water Works MunicipalIN524601722,1974UNRESOLVED
Indiana American Water - Lowell MunicipalIN524502911,9088UNRESOLVED
Borden Tri-County Region MunicipalIN521000211,63716UNRESOLVED
Hoosier Hills Regional Water District MunicipalIN52690028,6604UNRESOLVED
Rural Membership Water Corp. Of Clark Co MunicipalIN52100098,6304UNRESOLVED
Salem Water Works MunicipalIN52880058,20056UNRESOLVED
Superfund / NPL sites

Federal Cleanup Sites In Indiana

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.

Methodology →

SiteCityStatusFederal facilityPrimary contaminant
American Chemical Service, Inc.GriffithNPL FINALNo1,1,1,2-Tetrachloroethane
Beck'S LakeSouth BendNPL FINALNo—
Broadway Street Corridor Groundwater ContaminationAndersonNPL FINALNo—
Cam-Or Inc.WestvilleNPL FINALNo1,4-DioxaneHealth riskIARC Group 2B possible carcinogen; persistent in groundwater, resists conventional treatment. EPA HRL 0.35 µg/L (10⁻⁶ cancer risk). (IARC, EPA)
Cliff Drive Groundwater ContaminationLogansportNPL FINALNo—
Conrail Rail Yard (Elkhart)ElkhartNPL FINALNoCarbon TetrachlorideHealth riskIARC Group 2B possible carcinogen; liver toxic. EPA MCL 5 µg/L. Banned for most uses since 1986. (IARC, EPA)
Continental Steel Corp.KokomoNPL FINALNoArsenicHealth riskIARC Group 1 carcinogen via inhalation and ingestion. EPA MCL 10 µg/L; chronic exposure causes skin, lung, bladder cancer and cardiovascular disease. (IARC, EPA, ATSDR)
Douglas Road/Uniroyal, Inc., LandfillMishawakaNPL FINALNoAntimonyHealth riskInhaled antimony trioxide is an IARC Group 2B possible carcinogen; respiratory and cardiovascular effects from long-term exposure. EPA MCL 6 µg/L. (IARC, EPA)
Elm Street Ground Water ContaminationTerre HauteNPL FINALNo1,1,2,2-Tetrachloroethane
Envirochem Corp.ZionsvilleNPL FINALNo(E)-1,3-Dichloro-1-Propene

Showing the top 10 sites by status priority. 44 additional NPL-relevant sites in Indiana 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 Indiana block groups: 6,785,528 residents. Statewide disparity score for pm2.5 (fine particulate) sits below the reference (70). 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.

POPULATION SHARE
12.3%

Low-income

POPULATION SHARE
22.8%

People of color

POPULATION SHARE
6.4%

Under age 5

POPULATION SHARE
16.2%

Over age 64

NATIONAL PERCENTILE · vs all US block groups (population-weighted; ranked against the national EJScreen indicator distribution)

Methodology →

  • 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.66above the national median
  • OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.62above 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.54near 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.57near 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.95in the highest 5% 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.45near 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.66above 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.76above 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.68above 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.56near 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.71above 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.76above the national median
  • 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.78above the national median
EJ disparity scores · population-weighted, all state block groups (100 = national reference; higher = greater disparate burden) · Methodology →
IndicatorDisparity scoreReading
PM2.5 (fine particulate)70below the reference
Ozone74below the reference
Nitrogen dioxide (NO₂)62below the reference
Diesel particulate62below the reference
Toxic releases (RSEI)76below the reference
Traffic proximity47well below the reference
Lead-paint risk (pre-1960 housing)60below the reference
Superfund site proximity45well below the reference
RMP-facility proximity63below the reference
Hazardous-waste site proximity54below the reference
Underground storage tanks61below the reference
NPDES wastewater proximity58below the reference
Drinking-water non-compliance30well 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 83 Indiana Counties With TRI Data

Pollution trends and TRI 2024 pages for every tracked county. Alphabetical.

Sources.