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Horry County, South Carolina: environmental and disease records

Cancer mortality in Horry County is 153.9 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 1.2 times the U.S. rate. Federal databases place 1,761 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (1,220), Gas station (mapped facility) (170), Rail grade crossing (145). 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: 33.9345, -78.9729.

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 Horry County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
Melanoma of the skinDeaths2.521.25x1.9 to 3.22020-2024
Lung & bronchusDeaths37.330.21.24xSignificant35.1 to 39.62020-2024
Melanoma of the skinNew cases29.123.81.22xSignificant27 to 31.42019-2023
Childhood cancer (under 15)New cases19.916.41.21x14.8 to 26.22019-2023
Brain & nervous systemNew cases7.56.21.21xSignificant6.4 to 8.82019-2023
Brain & nervous systemDeaths5.34.41.2x4.4 to 6.22020-2024
Lung & bronchusNew cases60.751.81.17xSignificant57.9 to 63.62019-2023
BladderDeaths4.74.11.15x3.9 to 5.72020-2024
EsophagusDeaths4.13.71.11x3.4 to 4.92020-2024
EsophagusNew cases54.61.09x4.2 to 62019-2023
Kidney & renal pelvisNew cases19.317.91.08x17.6 to 21.22019-2023
All cancerDeaths153.9143.21.07xSignificant149.3 to 158.62020-2024
Non-Hodgkin lymphomaDeaths5.14.81.06x4.3 to 6.12020-2024
PancreasNew cases14.213.91.02x12.9 to 15.82019-2023
Liver & bile ductDeaths6.66.61x5.7 to 7.62020-2024
Non-Hodgkin lymphomaNew cases18.418.50.99x16.7 to 20.22019-2023
All cancerNew cases450.7453.40.99x442.4 to 459.12019-2023
PancreasDeaths11.111.30.98x9.9 to 12.42020-2024
BladderNew cases18.318.70.98x16.8 to 202019-2023
LeukemiaDeaths5.55.70.96x4.7 to 6.52020-2024
Liver & bile ductNew cases8.38.70.95x7.3 to 9.42019-2023
Kidney & renal pelvisDeaths3.13.40.91x2.5 to 3.92020-2024
LeukemiaNew cases12.414.50.86x11 to 142019-2023
StomachDeaths2.22.70.81x1.6 to 2.82020-2024
ThyroidNew cases10.2130.78x8.8 to 11.92019-2023
StomachNew cases56.60.76x4.2 to 5.92019-2023

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 Horry County
MeasureCountyU.S. medianDifferenceUnit
Premature death11,7479,842.6+19%years of life lost before age 75 per 100,000
Life expectancy74.675.3-1%years
Child mortality62.659.8+5%deaths under age 18 per 100,000
Infant mortality6.76.2+8%deaths under age 1 per 1,000 live births
Injury deaths114.496.9+18%deaths per 100,000
Drug overdose deaths56.328.6+97%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.

  • Formaldehyde18.06 per million
  • Carbon Tetrachloride2.94 per million
  • Acetaldehyde1.59 per million
  • Benzene0.8 per million

EPA Air Quality Index 2025

Monitored on 325 days: 268 good, 3 unhealthy for sensitive groups or worse. Median AQI 39, peak 170.

Regulated facilities, sites and hazards by type

1,761 active records inside the county from EPA ECHO, TRI, Superfund, Brownfields, NPDES, EIA, FAA, FRA and corrections data.

  • NPDES wastewater discharge permit1,220
  • Gas station (mapped facility)170
  • Rail grade crossing145
  • Auto repair or body shop (mapped facility)69
  • Air permit holder (minor source)63
  • Small hazardous waste generator31
  • Toxic chemical release facility (TRI)14
  • TRI reporting facility13
  • Dry cleaner (mapped facility)7
  • Major air pollution source5
  • Public airport4
  • Hazardous waste transporter4
  • Commercial airport3
  • Heliport3
  • Large hazardous waste generator2
  • Solar power plant2
  • Wastewater plant (mapped facility)2
  • EPA air quality monitor1
  • Landfill (mapped facility)1
  • Biomass power plant1
  • Oil-fired power plant1

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. New South Lumber & Wood Preserving Cos. - Conway Plant, Conway

    Toxic chemical release facility (TRI). Chemicals: Methanol, Manganese compounds, Lead And Lead Compounds, Dioxin and dioxin-like compounds. Reports carcinogens. 177,089 lbs released over 5 years.

    TRI facility ID 29526NWSTHHIGHW (U.S. EPA Toxics Release Inventory)

    Severity 8.5

  2. Avx Corp - Myrtle Beach Facility, Myrtle Beach

    Large hazardous waste generator. Penalties $13,000.

    EPA FRS registry ID 110056954158 (U.S. EPA ECHO) Agency record

    Severity 7

  3. Aalberts Integrated Piping System Americas, Myrtle Beach

    TRI reporting facility. Penalties $6,500.

    EPA FRS registry ID 110000587482 (U.S. EPA ECHO) Agency record

    Severity 6.4

  4. Aalberts Integrated Piping Systems Americas, Conway

    Toxic chemical release facility (TRI). Chemicals: Chromium, Nickel, Cobalt, Manganese and 3 more. Reports carcinogens. 254 lbs released over 5 years.

    TRI facility ID 29526CNBRCHWY50 (U.S. EPA Toxics Release Inventory)

    Severity 6.3

  5. Canfor Southern Pine - Conway Mill, Conway

    TRI reporting facility.

    EPA FRS registry ID 110000740789 (U.S. EPA ECHO) Agency record

    Severity 6.3

  6. Cresent Beach Wwtp, North Myrtle Beach

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110039693347 (U.S. EPA ECHO) Agency record

    Severity 6

  7. Gsw&Sa/Conway Wwtp, Conway

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110006623243 (U.S. EPA ECHO) Agency record

    Severity 5.8

  8. Gsw&Sa Longs Wwtp, Longs

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110009793376 (U.S. EPA ECHO) Agency record

    Severity 5.8

  9. Avx Corp - Myrtle Beach Facility, Myrtle Beach

    NPDES wastewater discharge permit. Penalties $13,000.

    EPA FRS registry ID 110056954158 (U.S. EPA ECHO) Agency record

    Severity 5.5

  10. Coastal Carolina University, Conway

    EPA air quality monitor.

    Record ID 450510008 (U.S. EPA AirData)

    Severity 5.4

  11. Gsw&Sa Schwartz Myrtle Beach & Bucksport Reg Wwtps, Conway

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110039825543 (U.S. EPA ECHO) Agency record

    Severity 5.3

  12. Avx Corp - Myrtle Beach Facility, Myrtle Beach

    Air permit holder (minor source). Penalties $13,000.

    EPA FRS registry ID 110056954158 (U.S. EPA ECHO) Agency record

    Severity 5

  13. Soilutions, Llc/Edge Road Mine, Conway

    NPDES wastewater discharge permit. Penalties $16,000.

    EPA FRS registry ID 110071206158 (U.S. EPA ECHO) Agency record

    Severity 5

  14. Myrtle Beach Intl, Myrtle Beach

    Commercial airport. O.

    Record ID MYR (FAA / U.S. DOT)

    Severity 5

  15. Aalberts Integrated Piping System Americas, Myrtle Beach

    Large hazardous waste generator. Penalties $6,500.

    EPA FRS registry ID 110000587482 (U.S. EPA ECHO) Agency record

    Severity 4.8

  16. Gsw&Sa/George R Vereen Wwtp, Conway

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110009793438 (U.S. EPA ECHO) Agency record

    Severity 4.8

  17. Rinker Myrtle Beach Pipe, Aynor

    Toxic chemical release facility (TRI). Chemicals: Lead. Reports carcinogens.

    TRI facility ID 2951WRNKRM582VA (U.S. EPA Toxics Release Inventory)

    Severity 4.5

  18. S&W Little River Plant, Little River

    Toxic chemical release facility (TRI). Chemicals: Lead. Reports carcinogens.

    TRI facility ID 2956WSWLTT14RED (U.S. EPA Toxics Release Inventory)

    Severity 4.5

  19. S&W Murrells Inlet, Murrells Inlet

    Toxic chemical release facility (TRI). Chemicals: Lead. Reports carcinogens.

    TRI facility ID 2957WSWMRR12414 (U.S. EPA Toxics Release Inventory)

    Severity 4.5

  20. S&W Conway Plant, Conway

    Toxic chemical release facility (TRI). Chemicals: Lead. Reports carcinogens.

    TRI facility ID 2952WSWCNW13WIN (U.S. EPA Toxics Release Inventory)

    Severity 4.5

  21. Avx Corporation, Conway

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110000862488 (U.S. EPA ECHO) Agency record

    Severity 4.5

  22. Gsw&Sa Yauhannah Tree Farm, Conway

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110028273384 (U.S. EPA ECHO) Agency record

    Severity 4.5

  23. Metglas Inc, Conway

    Toxic chemical release facility (TRI). Chemicals: Nickel compounds, Cobalt And Cobalt Compounds, Phosphorus (yellow or white), Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) and 2 more. Reports carcinogens.

    TRI facility ID 29526HNYWL440AL (U.S. EPA Toxics Release Inventory)

    Severity 4.5

  24. Wolverine Brass Inc, Conway

    Toxic chemical release facility (TRI). Chemicals: Lead, Copper. Reports carcinogens.

    TRI facility ID 29526WLVRN8027H (U.S. EPA Toxics Release Inventory)

    Severity 4.5

  25. Bucksport Wtr Sys Pauley Swamp Well Ros, Conway

    NPDES wastewater discharge permit. Penalties $5,000.

    EPA FRS registry ID 110063023749 (U.S. EPA ECHO) Agency record

    Severity 4.3

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 Horry 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 Horry 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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