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Darlington County, South Carolina: environmental and disease records

Cancer mortality in Darlington County is 179.4 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. The strongest disease signals are Lung & bronchus deaths at 1.4 times the U.S. rate. Federal databases place 352 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (146), Rail grade crossing (93), Air permit holder (minor source) (19). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 30 in a million, driven mainly by formaldehyde.

Rates are age-adjusted per 100,000 people. A cancer signal is marked significant when the lower bound of its 95 percent confidence interval is above the U.S. rate. Facility counts use active federal records located inside the county boundary. Approximate county center: 34.3099, -79.9117.

How this county ranks in South Carolina

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Cancer deaths and new cases versus the United States

Source: NCI and CDC State Cancer Profiles, both sexes, all ages. Sorted by the ratio of the county rate to the U.S. rate.

Cancer rates for Darlington County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
StomachDeaths42.71.48x2.3 to 6.52020-2024
Lung & bronchusDeaths41.830.21.38xSignificant35.9 to 48.52020-2024
Lung & bronchusNew cases65.851.81.27xSignificant58.4 to 742019-2023
All cancerDeaths179.4143.21.25xSignificant166.5 to 193.12020-2024
Brain & nervous systemDeaths5.44.41.23x3.3 to 8.62020-2024
Kidney & renal pelvisDeaths4.13.41.21x2.4 to 6.82020-2024
Liver & bile ductDeaths7.96.61.2x5.5 to 11.22020-2024
Non-Hodgkin lymphomaDeaths5.74.81.19x3.5 to 8.82020-2024
Liver & bile ductNew cases9.68.71.1x6.9 to 13.22019-2023
StomachNew cases7.16.61.08x4.7 to 10.42019-2023
EsophagusNew cases4.84.61.04x3 to 7.32019-2023
PancreasNew cases14.113.91.01x10.7 to 18.32019-2023
PancreasDeaths1111.30.97x8.1 to 14.82020-2024
All cancerNew cases427.7453.40.94x407.6 to 448.62019-2023
Kidney & renal pelvisNew cases16.417.90.92x12.5 to 21.22019-2023
LeukemiaDeaths5.25.70.91x3.2 to 8.22020-2024
Brain & nervous systemNew cases5.46.20.87x3.2 to 8.52019-2023
LeukemiaNew cases12.314.50.85x9 to 16.52019-2023
Non-Hodgkin lymphomaNew cases13.118.50.71x9.8 to 17.32019-2023
BladderNew cases13.118.70.7x9.9 to 17.22019-2023
Melanoma of the skinNew cases11.323.80.47x8.2 to 15.32019-2023
ThyroidNew cases5.6130.43x3.2 to 92019-2023

Mortality measures versus the U.S. county median

Source: County Health Rankings, built from CDC National Vital Statistics System death records. The comparison value is the median of all U.S. counties.

Mortality measures for Darlington County
MeasureCountyU.S. medianDifferenceUnit
Premature death15,869.39,842.6+61%years of life lost before age 75 per 100,000
Life expectancy69.975.3-7%years
Child mortality77.259.8+29%deaths under age 18 per 100,000
Infant mortality86.2+28%deaths under age 1 per 1,000 live births
Injury deaths116.396.9+20%deaths per 100,000
Drug overdose deaths30.328.6+6%deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 30 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

  • Formaldehyde21.73 per million
  • Carbon Tetrachloride2.94 per million
  • Acetaldehyde2.26 per million
  • Benzene0.82 per million

EPA Air Quality Index 2025

Monitored on 254 days: 226 good, 0 unhealthy for sensitive groups or worse. Median AQI 40, peak 97.

Regulated facilities, sites and hazards by type

352 active records inside the county from EPA ECHO, TRI, Superfund, Brownfields, NPDES, EIA, FAA, FRA and corrections data.

  • NPDES wastewater discharge permit146
  • Rail grade crossing93
  • Air permit holder (minor source)19
  • Gas station (mapped facility)16
  • Brownfield property13
  • Toxic chemical release facility (TRI)9
  • Major air pollution source8
  • Small hazardous waste generator8
  • TRI reporting facility7
  • Wastewater plant (mapped facility)7
  • Solar power plant4
  • Landfill (mapped facility)3
  • Public airport2
  • Commercial airport2
  • Auto repair or body shop (mapped facility)2
  • Large greenhouse gas emitter2
  • Large hazardous waste generator2
  • Heliport2
  • EPA air quality monitor1
  • Hazardous waste transporter1
  • Biomass power plant1
  • Nuclear power plant1
  • Oil-fired power plant1
  • Scrapyard (mapped facility)1
  • Superfund (NPL) site1

Highest-severity records

The 25 records with the highest Envyrofax severity in the county, with the agency identifier to cite in a records request.

  1. Sonoco Products Co, Hartsville

    TRI reporting facility. Penalties $77,170.

    EPA FRS registry ID 110000587491 (U.S. EPA ECHO) Agency record

    Severity 10

  2. Galey and Lord Plant, Society Hill

    Superfund (NPL) site. Hazard Ranking System score 50. NPL Site.

    EPA site ID SCD058189622 (U.S. EPA Superfund (SEMS/NPL)) Agency record

    Severity 10

  3. Sonoco Products Co, Hartsville

    Toxic chemical release facility (TRI). Chemicals: Ammonia, Methanol, Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead And Lead Compounds and 4 more. Reports carcinogens. 1,372,714 lbs released over 5 years.

    TRI facility ID 29550SNCPRNORTH (U.S. EPA Toxics Release Inventory)

    Severity 9.2

  4. Barrier Reef Pools, Timmonsville

    Toxic chemical release facility (TRI). Chemicals: Styrene. Reports carcinogens. 808,525 lbs released over 5 years.

    TRI facility ID 2916WBRRRR165EV (U.S. EPA Toxics Release Inventory)

    Severity 9

  5. Nucor Corp - Darlington Plant, Darlington

    TRI reporting facility.

    EPA FRS registry ID 110008566845 (U.S. EPA ECHO) Agency record

    Severity 8.7

  6. Stingray Boats, Hartsville

    Toxic chemical release facility (TRI). Chemicals: Styrene. Reports carcinogens. 216,925 lbs released over 5 years.

    TRI facility ID 29550STNGREASTR (U.S. EPA Toxics Release Inventory)

    Severity 8.6

  7. Nucor Steel-Darlington, Darlington

    Toxic chemical release facility (TRI). Chemicals: Zinc compounds, Manganese And Manganese Compounds, Nickel And Nickel Compounds, Copper And Copper Compounds and 4 more. Reports carcinogens. 30,190 lbs released over 5 years.

    TRI facility ID 29532NCRSTBOX52 (U.S. EPA Toxics Release Inventory)

    Severity 7.9

  8. Canfor Southern Pine-Darlington Plant, Darlington

    Toxic chemical release facility (TRI). Chemicals: Methanol, Lead And Lead Compounds, Dioxin and dioxin-like compounds. Reports carcinogens. 19,554 lbs released over 5 years.

    TRI facility ID 2953WNWSTH11CHE (U.S. EPA Toxics Release Inventory)

    Severity 7.8

  9. Wellman Inc, Darlington

    TRI reporting facility. Penalties $58,000.

    EPA FRS registry ID 110000353769 (U.S. EPA ECHO) Agency record

    Severity 7.8

  10. Sonoco Products Co, Hartsville

    Major air pollution source. Penalties $77,170.

    EPA FRS registry ID 110000587491 (U.S. EPA ECHO) Agency record

    Severity 7.5

  11. Frazier Industrial Company, Lamar

    TRI reporting facility. Penalties $500.

    EPA FRS registry ID 110001674858 (U.S. EPA ECHO) Agency record

    Severity 7.2

  12. Sonoco Products Co, Hartsville

    NPDES wastewater discharge permit. Penalties $77,170.

    EPA FRS registry ID 110000587491 (U.S. EPA ECHO) Agency record

    Severity 7

  13. Frazier Industrial Co, Lamar

    Toxic chemical release facility (TRI). Chemicals: 1,2,4-Trimethylbenzene. 136,085 lbs released over 5 years.

    TRI facility ID 29069FRZRN4537L (U.S. EPA Toxics Release Inventory)

    Severity 6.9

  14. Wellman Inc, Darlington

    NPDES wastewater discharge permit. Penalties $58,000.

    EPA FRS registry ID 110000353769 (U.S. EPA ECHO) Agency record

    Severity 6.8

  15. Stingray Boats, Hartsville

    TRI reporting facility.

    EPA FRS registry ID 110000353947 (U.S. EPA ECHO) Agency record

    Severity 6.5

  16. Nucor Corp - Darlington Plant, Darlington

    Major air pollution source.

    EPA FRS registry ID 110008566845 (U.S. EPA ECHO) Agency record

    Severity 6.5

  17. Barrier Reef Pools Llc, Timmonsville

    TRI reporting facility.

    EPA FRS registry ID 110043295984 (U.S. EPA ECHO) Agency record

    Severity 6.4

  18. Nucor Corp - Darlington Plant, Darlington

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110008566845 (U.S. EPA ECHO) Agency record

    Severity 6

  19. Hartsville Wwtf, Hartsville

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110002040425 (U.S. EPA ECHO) Agency record

    Severity 5.8

  20. Darlington/Black Creek Wwtf, Darlington

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110002041120 (U.S. EPA ECHO) Agency record

    Severity 5.8

  21. Fiber Industries Llc, Darlington

    Toxic chemical release facility (TRI). Chemicals: Ethylene glycol, Biphenyl. 2,000 lbs released over 5 years.

    TRI facility ID 29502FBRNDPOBOX (U.S. EPA Toxics Release Inventory)

    Severity 5.5

  22. Sonoco Products Co, Hartsville

    Small hazardous waste generator. Penalties $77,170.

    EPA FRS registry ID 110000587491 (U.S. EPA ECHO) Agency record

    Severity 5.5

  23. Lamar Town Of, Lamar

    NPDES wastewater discharge permit. Penalties $4,000.

    EPA FRS registry ID 110020998170 (U.S. EPA ECHO) Agency record

    Severity 5.5

  24. Canfor Southern Pine - Darlington, Darlington

    TRI reporting facility. Penalties $17,775.

    EPA FRS registry ID 110007026903 (U.S. EPA ECHO) Agency record

    Severity 5.5

  25. Polyquest Inc., Darlington

    Toxic chemical release facility (TRI). Chemicals: Ethylene glycol. 701 lbs released over 5 years.

    TRI facility ID 2954WPLYQS172MI (U.S. EPA Toxics Release Inventory)

    Severity 5.2

Correctional facilities

Prisons, jails and corrections operations with an EPA facility record, and the drinking water and wastewater compliance attached to them.

No correctional facility with an EPA record is located in this county.

Discovery / public records

Records to request for Darlington County

  • South Carolina state cancer registry

    Cancer incidence counts by census tract or ZIP code, by cancer type and year (de-identified). Any cancer cluster inquiries or investigations in Darlington County, and their findings.

  • South Carolina vital statistics office

    Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.

  • South Carolina health department, environmental epidemiology

    Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.

  • South Carolina environmental agency and the U.S. EPA regional office

    Compliance history, inspection reports, notices of violation, penalties and enforcement actions for each facility above, cited by EPA FRS registry ID.

  • South Carolina drinking water program

    Violation notices, sampling results and sanitary surveys for the public water systems serving the county, including any system serving a correctional facility.

  • Department of corrections or county sheriff

    Water testing, grievances and environmental health inspections for the correctional facilities listed above.

Each Envyrofax address report includes a printable records request worksheet with the custodian and the exact request wording per finding.

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