Pollution Analyst
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State · TRI 2024

Oklahoma Pollution

275 TRI facilities, 884 public water systems, and 18 Superfund / NPL sites across 54 counties. Statewide TRI releases held roughly steady year over year (+1%). Toxic releases concentrations are roughly unchanged from 2010.

FIPS 40 · population 3,959,353 · 77 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/m³.11 µg/m³'10'12'14'16'18'20'22'248 µg/m³
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

Oklahoma 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.

8.17 µg/m³ · -5% YoY · -25% since 2010

PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have fallen 25% 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.

18.93 µg/m³ · -1% YoY · -26% since 2010

PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour)) concentrations have fallen 26% 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.

0.069 ppm · -2% YoY · -16% since 2010

Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) concentrations have fallen 16% 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.

6.5 ppb · -6% YoY · -27% since 2010

NO₂ annual mean (NAAQS 53 ppb (annual)) concentrations have fallen 27% 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.

29.8 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.

1.67 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.

18.1M lb · -2% YoY · -5% since 2010

TRI air releases (5.1 fugitive + 5.2 stack) concentrations are roughly unchanged from 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.

5.1M lb · +4% YoY · +24% since 2010

TRI water releases (5.3) concentrations are up 24% 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.

12.7M lb · +5% YoY · -12% since 2010

TRI land + off-site releases concentrations have fallen 12% since 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.

151M metric tons CO₂e · -8% YoY · +14% since 2010

Greenhouse gases (GHGRP large emitters, through 2023) concentrations are up 14% since 2010.

Top counties · TRI 2024

Oklahoma Counties With Most Chemical Releases

Methodology →

CountyPopulationFacilitiesTotal releasesYoYTop chemical
Mayes CountyFIPS 4009739,324116.8M lb+34%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)
Garfield CountyFIPS 4004762,45636.2M lb+4%AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)
McCurtain CountyFIPS 4008931,00366.1M lb-25%MethanolHealth riskAcutely toxic if ingested or inhaled. Metabolizes to formaldehyde and formic acid, causing blindness and metabolic acidosis. (EPA)
Major CountyFIPS 400937,67813.5M lb+23%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)
Rogers CountyFIPS 4013195,870183.2M lb+46%AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)
Tulsa CountyFIPS 40143668,923562.3M lb-18%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)
Kay CountyFIPS 4007143,85971.9M lb-2%Polychlorinated biphenylsHealth riskPCBs. IARC Group 1 carcinogen; immune, reproductive, and neurological effects; bioaccumulate in fish and breast milk. Banned in 1979; persist as legacy contamination. (IARC, EPA)
Woodward CountyFIPS 4015320,41151.4M lb+2%AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)
Osage CountyFIPS 4011346,0041500k lb-32%EthyleneHealth riskSimple asphyxiant at high concentrations; precursor to many polymers; low direct toxicity. (NIOSH)
Le Flore CountyFIPS 4007948,5253456k lb+33%Manganese And Manganese CompoundsHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR)
Top facilities · TRI 2024

The Largest Individual Emitters In Oklahoma

Methodology →

FacilityCityTop chemicalTotal releasesYoY
Koch Fertilizer Enid LLCKoch INCEnidAmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)6.1M lb+4%
International Paper COInternational Paper CoValliantMethanolHealth riskAcutely toxic if ingested or inhaled. Metabolizes to formaldehyde and formic acid, causing blindness and metabolic acidosis. (EPA)4.5M lb-22%
Clean Harbors Lone Mountain LLC Lone Mountain FacilityClean Harbors INCWaynokaChromium 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)3.5M lb+23%
Lsb Chemical L.L.C.Lsb Industries INCPryorNitrate 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)3.4M lb+33%
Pryor SolaeInternational Flavors & Fragrances INCPryorNitrate 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+40%
Terra Nitrogen L.P. Verdigris PlantCf Industries Holdings INCClaremoreAmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)2.6M lb+46%
Terra International (Oklahoma) Llc.Cf Industries Holdings INCWoodwardAmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)1.3M lb+4%
Tyson Poultry Inc-Broken Bow Processing PlantTyson Foods INCBroken BowNitrate 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)1.3M lb-38%
US Ecology Tulsa INCRepublic Services INCTulsaDiethanolamineHealth riskSkin and eye irritant. Reacts with nitrites to form nitrosamines (probable carcinogens). (NIOSH)1.3M lb-30%
A-Line Tds INC.A-Line Tds INCTonkawaPolychlorinated biphenylsHealth riskPCBs. IARC Group 1 carcinogen; immune, reproductive, and neurological effects; bioaccumulate in fish and breast milk. Banned in 1979; persist as legacy contamination. (IARC, EPA)1.3M lb+8%
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
Moore Public Works Authority MunicipalOK200141255,08312UNRESOLVED
Stillwater Utilities Authority MunicipalOK102122053,00026UNRESOLVED
Enid MunicipalOK200241249,3471UNRESOLVED
Muskogee MunicipalOK102160738,31030UNRESOLVED
Bartlesville MunicipalOK102140134,7481UNRESOLVED
Shawnee Municipal Authority MunicipalOK102050429,9908UNRESOLVED
Wagoner Co. Rwd #4 MunicipalOK102152925,79286UNRESOLVED
Ardmore MunicipalOK101081424,8939UNRESOLVED
Duncan Public Utilities Authority MunicipalOK101080923,00022UNRESOLVED
Bethany MunicipalOK200551920,3072UNRESOLVED
Superfund / NPL sites

Federal Cleanup Sites In Oklahoma

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
Eagle IndustriesMidwest CityNPL FINALNo—
Fansteel Metals/FmriMuskogeeNPL FINALNo—
Hardage/CrinerCrinerNPL FINALNo1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR)
Henryetta Iron And MetalHenryettaNPL FINALNo—
Hudson RefineryCushingNPL 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)
Oklahoma Refining Co.CyrilNPL FINALNo2,4-Dimethylphenol
Tar Creek (Ottawa County)Ottawa CountyNPL FINALNoLeadHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)
Tinker Air Force Base (Soldier Creek/Building 3001)Oklahoma CityNPL FINALFEDERALTetrachloroetheneHealth 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)
Wilcox Oil CompanyCreek CountyNPL FINALNoBenzo[A]PyreneHealth riskPAH; IARC Group 1 carcinogen; the prototypical PAH used to benchmark PAH-mixture cancer risk. EPA MCL 0.2 µg/L. (IARC, EPA)
National Zinc Corp.BartlesvillePROPOSEDNoCadmium

Showing the top 10 sites by status priority. 8 additional NPL-relevant sites in Oklahoma 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 Oklahoma block groups: 3,959,353 residents. Statewide disparity score for pm2.5 (fine particulate) sits near the reference (102). 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
15.2%

Low-income

POPULATION SHARE
36.3%

People of color

POPULATION SHARE
6.6%

Under age 5

POPULATION SHARE
15.9%

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.75above the national median
  • OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.43near 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.44near 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.37below 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.83in 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.42near 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.56near 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.66above 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.40near 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.60above 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.68above 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.97in the highest 5% nationally
EJ disparity scores · population-weighted, all state block groups (100 = national reference; higher = greater disparate burden) · Methodology →
IndicatorDisparity scoreReading
PM2.5 (fine particulate)102near the reference
Ozone91near the reference
Nitrogen dioxide (NO₂)65below the reference
Diesel particulate54below the reference
Toxic releases (RSEI)57below the reference
Traffic proximity49well below the reference
Lead-paint risk (pre-1960 housing)63below the reference
Superfund site proximity14well below the reference
RMP-facility proximity72below the reference
Hazardous-waste site proximity42well below the reference
Underground storage tanks70below the reference
NPDES wastewater proximity55below the reference
Drinking-water non-compliance61below 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 54 Oklahoma Counties With TRI Data

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

Sources.