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Merrimack County, New Hampshire: environmental and disease records

Cancer mortality in Merrimack County is 148.5 deaths per 100,000 people per year against a U.S. rate of 143.2. The strongest disease signals are Brain & nervous system deaths at 1.5 times the U.S. rate. Federal databases place 827 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (336), Air permit holder (minor source) (180), Gas station (mapped facility) (74). 4 correctional facilities operate in the county. EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 20 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: 43.3038, -71.6768.

How this county ranks in New Hampshire

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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 Merrimack County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
Brain & nervous systemDeaths6.74.41.52xSignificant5.2 to 8.62020-2024
BladderNew cases26.218.71.4xSignificant23.2 to 29.52019-2023
Brain & nervous systemNew cases8.46.21.35xSignificant6.6 to 10.62019-2023
ThyroidNew cases17131.31xSignificant14.2 to 20.12019-2023
Melanoma of the skinNew cases30.123.81.26xSignificant26.8 to 33.92019-2023
Non-Hodgkin lymphomaDeaths5.94.81.23x4.5 to 7.62020-2024
EsophagusDeaths4.43.71.19x3.3 to 5.92020-2024
LeukemiaNew cases16.914.51.17x14.4 to 19.82019-2023
EsophagusNew cases5.34.61.15x4.1 to 6.92019-2023
Lung & bronchusNew cases58.151.81.12xSignificant53.7 to 62.92019-2023
All cancerNew cases502.4453.41.11xSignificant488.5 to 516.62019-2023
PancreasNew cases1513.91.08x12.7 to 17.62019-2023
PancreasDeaths11.911.31.05x9.9 to 14.12020-2024
Melanoma of the skinDeaths2.121.05x1.3 to 3.32020-2024
Non-Hodgkin lymphomaNew cases19.418.51.05x16.7 to 22.42019-2023
All cancerDeaths148.5143.21.04x141.2 to 156.12020-2024
LeukemiaDeaths5.95.71.04x4.5 to 7.72020-2024
Kidney & renal pelvisNew cases18.117.91.01x15.6 to 212019-2023
StomachNew cases6.56.60.98x4.9 to 8.32019-2023
Lung & bronchusDeaths29.330.20.97x26.2 to 32.72020-2024
Liver & bile ductNew cases7.78.70.89x6.1 to 9.62019-2023
BladderDeaths3.44.10.83x2.4 to 4.82020-2024
Kidney & renal pelvisDeaths2.83.40.82x1.9 to 4.12020-2024
Liver & bile ductDeaths5.36.60.8x4 to 6.92020-2024
StomachDeaths1.92.70.7x1.1 to 32020-2024

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 Merrimack County
MeasureCountyU.S. medianDifferenceUnit
Premature death6,692.39,842.6-32%years of life lost before age 75 per 100,000
Life expectancy7975.3+5%years
Child mortality29.859.8-50%deaths under age 18 per 100,000
Infant mortality3.56.2-43%deaths under age 1 per 1,000 live births
Injury deaths93.896.9-3%deaths per 100,000
Drug overdose deaths29.328.6+3%deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 20 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

  • Formaldehyde13.76 per million
  • Carbon Tetrachloride2.99 per million
  • Acetaldehyde1.65 per million
  • Naphthalene1.55 per million

EPA Air Quality Index 2025

Monitored on 212 days: 205 good, 0 unhealthy for sensitive groups or worse. Median AQI 37, peak 90.

Regulated facilities, sites and hazards by type

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

  • NPDES wastewater discharge permit336
  • Air permit holder (minor source)180
  • Gas station (mapped facility)74
  • Auto repair or body shop (mapped facility)55
  • Brownfield property33
  • Rail grade crossing25
  • Small hazardous waste generator19
  • Toxic chemical release facility (TRI)16
  • Heliport15
  • TRI reporting facility12
  • Large hazardous waste generator10
  • Industrial wastewater discharge10
  • Hydroelectric plant10
  • Hazardous waste transporter5
  • Public airport4
  • Correctional facility (prison or jail)4
  • Major air pollution source3
  • Dry cleaner (mapped facility)3
  • EPA air quality monitor2
  • Airfield2
  • Landfill (mapped facility)2
  • Wastewater plant (mapped facility)2
  • Commercial airport1
  • Large greenhouse gas emitter1
  • Biomass power plant1
  • Coal power plant1
  • Scrapyard (mapped facility)1

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. Gsp Merrimack Llc, Bow

    TRI reporting facility. Penalties $202,208.

    EPA FRS registry ID 110071198058 (U.S. EPA ECHO) Agency record

    Severity 9.1

  2. Merrimack Station, Bow

    Toxic chemical release facility (TRI). Chemicals: Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Barium And Barium Compounds, Ammonia and 4 more. Reports carcinogens. 181,257 lbs released over 5 years.

    TRI facility ID 03304PBLCS97RIV (U.S. EPA Toxics Release Inventory)

    Severity 8.5

  3. Elektrisola Inc., Boscawen

    Toxic chemical release facility (TRI). Chemicals: N-Methyl-2-pyrrolidone, Phenol, Cresol (mixed isomers), Xylene (mixed isomers) and 4 more. Reports carcinogens. 35,849 lbs released over 5 years.

    TRI facility ID 03303LKTRS126HI (U.S. EPA Toxics Release Inventory)

    Severity 8

  4. Kalwall Corp Flat Shee T Div, Bow

    Toxic chemical release facility (TRI). Chemicals: Styrene, Methyl methacrylate, Propylene. Reports carcinogens. 10,931 lbs released over 5 years.

    TRI facility ID 03301KLWLLRIVER (U.S. EPA Toxics Release Inventory)

    Severity 7.6

  5. Ge Co, Hooksett

    Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Chromium, Nickel, Barium compounds (except for barium sulfate (CAS No. 7727-43-7)). Reports carcinogens. 616 lbs released over 5 years.

    TRI facility ID 03106GNRLL31HOO (U.S. EPA Toxics Release Inventory)

    Severity 6.6

  6. Watts Regulator Co Dba Webster Valve, Franklin

    Toxic chemical release facility (TRI). Chemicals: Copper, Zinc compounds, Copper compounds, Copper And Copper Compounds and 4 more. Reports carcinogens. 413 lbs released over 5 years.

    TRI facility ID 03235WBSTRSMAIN (U.S. EPA Toxics Release Inventory)

    Severity 6.5

  7. Gsp Merrimack Llc, Bow

    Major air pollution source. Penalties $202,208.

    EPA FRS registry ID 110071198058 (U.S. EPA ECHO) Agency record

    Severity 6.5

  8. Merrimack, Bow

    Coal power plant.

    Record ID 2364 (U.S. Energy Information Administration)

    Severity 6.5

  9. Pitco Frialator Inc, Bow

    Toxic chemical release facility (TRI). Chemicals: Chromium, Nickel, Manganese. Reports carcinogens. 174 lbs released over 5 years.

    TRI facility ID 03304PTCFR509RT (U.S. EPA Toxics Release Inventory)

    Severity 6.2

  10. Gsp Merrimack Llc, Bow

    NPDES wastewater discharge permit. Penalties $202,208.

    EPA FRS registry ID 110071198058 (U.S. EPA ECHO) Agency record

    Severity 6

  11. Elektrisola Inc, Boscawen

    TRI reporting facility.

    EPA FRS registry ID 110000313795 (U.S. EPA ECHO) Agency record

    Severity 5.8

  12. Kalwall Flat Sheet Division, Bow

    TRI reporting facility.

    EPA FRS registry ID 110024891535 (U.S. EPA ECHO) Agency record

    Severity 5.6

  13. Heat & Control, Pembroke

    Toxic chemical release facility (TRI). Chemicals: Nickel, Chromium. Reports carcinogens. 20 lbs released over 5 years.

    TRI facility ID 03275HTCNT339CM (U.S. EPA Toxics Release Inventory)

    Severity 5.5

  14. Wrbp Franklin Wastewater Treatment Plant, Franklin

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110001523343 (U.S. EPA ECHO) Agency record

    Severity 5.5

  15. Gsp Merrimack Llc, Bow

    Large greenhouse gas emitter. Penalties $202,208.

    EPA FRS registry ID 110071198058 (U.S. EPA ECHO) Agency record

    Severity 5.5

  16. Webster Valve, Franklin

    TRI reporting facility.

    EPA FRS registry ID 110000313697 (U.S. EPA ECHO) Agency record

    Severity 5.4

  17. Pike Industries Inc - Northfield, Northfield

    Toxic chemical release facility (TRI). Chemicals: Polycyclic aromatic compounds, Benzo[g,h,i]perylene, Lead. Reports carcinogens. 10 lbs released over 5 years.

    TRI facility ID 0327WPKNDS35IND (U.S. EPA Toxics Release Inventory)

    Severity 5.3

  18. Hooksett Crushed Stone Pike Industries Inc, Hooksett

    Toxic chemical release facility (TRI). Chemicals: Polycyclic aromatic compounds, Lead, Benzo[g,h,i]perylene. Reports carcinogens. 4 lbs released over 5 years.

    TRI facility ID 03106HKSTT38HAC (U.S. EPA Toxics Release Inventory)

    Severity 5

  19. Pittsfield Wastewater Treatment Facility, Pittsfield

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110006619436 (U.S. EPA ECHO) Agency record

    Severity 5

  20. General Electric Aviation, Hooksett

    TRI reporting facility.

    EPA FRS registry ID 110000313660 (U.S. EPA ECHO) Agency record

    Severity 5

  21. Henniker Wastewater Treatment Facility, Henniker

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110006619276 (U.S. EPA ECHO) Agency record

    Severity 4.8

  22. Ge Aerospace, Hooksett

    Large hazardous waste generator. Penalties $7,005.

    EPA FRS registry ID 110067203822 (U.S. EPA ECHO) Agency record

    Severity 4.8

  23. Pitco Frialator Inc, Bow

    TRI reporting facility.

    EPA FRS registry ID 110000313811 (U.S. EPA ECHO) Agency record

    Severity 4.7

  24. Brox Industries Inc, Hooksett

    Toxic chemical release facility (TRI). Chemicals: Benzo[g,h,i]perylene, Polycyclic aromatic compounds. Reports carcinogens.

    TRI facility ID 03106BRXND1500H (U.S. EPA Toxics Release Inventory)

    Severity 4.5

  25. Agile Magnetics, Concord

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

    TRI facility ID 03301RGNLM24CHE (U.S. EPA Toxics Release Inventory)

    Severity 4.5

Correctional facilities

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

Discovery / public records

Records to request for Merrimack County

  • New Hampshire 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 Merrimack County, and their findings.

  • New Hampshire vital statistics office

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

  • New Hampshire health department, environmental epidemiology

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

  • New Hampshire 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.

  • New Hampshire 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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