{
  "slug": "residential-gas-leak",
  "question": "What are the odds of dying in a residential gas leak explosion or fire?",
  "category": "health",
  "tags": [
    "household"
  ],
  "no_reliable_estimate": false,
  "perceived": {
    "description": "Fuel-gas leaks occupy a vivid spot in the public imagination. The smell of mercaptan -- the odorant added to natural gas and propane -- triggers immediate alarm in most households, and news coverage of gas explosions in apartment buildings or row houses reinforces the sense that a leak is a step away from catastrophe. Most people who use gas appliances have evacuated a building at some point on a suspected leak, which creates an outsized mental availability relative to the actual fatality count. The risk feels imminent in a way that lightning or carbon monoxide does not, because there is a sensory cue: a smell you can act on.\n",
    "rough_estimate": "Most adults probably guess several hundred residential gas deaths per year -- closer to the actual figure for CO",
    "kind": "intuition"
  },
  "native": {
    "display": "~40 US deaths per year from residential fuel-gas leak fires and explosions",
    "numerator": 1,
    "denominator": 8250000,
    "unit": "per year",
    "population": "US residents, all ages, deaths from natural gas or LP-gas ignited fires and gas distribution incidents"
  },
  "normalized": {
    "lifetime_us_adult": 0.0000071,
    "display": "1 in ~140,000 lifetime (US adult)",
    "log_value": -5.15,
    "assumptions": "Two data streams are combined. PHMSA reported 23 fatalities from natural gas distribution system incidents in 2023 (all causes across ~72 million customers). NFPA's propane-fires report (2012-2016) shows an annual average of 25 civilian deaths in home structure fires where LP-gas was the first material ignited. Combined and de-duplicated (some PHMSA distribution incidents that ignite a structure are already captured in NFPA residential fire data), a plausible central estimate is ~40 residential fuel-gas-ignited deaths per year -- natural gas and propane combined, fire/explosion mechanism only, excluding carbon monoxide asphyxiation from combustion products (covered separately). 40 / 330,000,000 = 1.21e-7 annual rate. Compounded over 59 years of remaining adult life: 1 - (1 - 1.21e-7)^59 = approximately 7.1e-6, or about 1 in 140,000. Annual uncertainty range 25-60 deaths gives normalized low ~4.5e-6, high ~1.1e-5.\n",
    "uncertainty": {
      "low": 0.0000045,
      "high": 0.000011
    },
    "scope": "us_adult_lifetime"
  },
  "sources": [
    {
      "url": "https://www.phmsa.dot.gov/data-and-statistics/pipeline/pipeline-incident-20-year-trends",
      "title": "Pipeline Incident 20 Year Trends -- Gas Distribution",
      "publisher": "Pipeline and Hazardous Materials Safety Administration (PHMSA), US Department of Transportation",
      "source_type": "govt_report",
      "statistic": "In 2023 there were 613 gas distribution incidents with 23 fatalities and 39 injuries reported to PHMSA",
      "excerpt": "\"In 2023, there were 613 gas distribution incidents, with 23 fatalities and 39 injuries reported.\"\n",
      "source_date": "2024-01-01",
      "source_accessed": "2026-05-10",
      "archive_url": "http://web.archive.org/web/20260509175611/https://www.phmsa.dot.gov/data-and-statistics/pipeline/pipeline-incident-20-year-trends",
      "calculation_notes": "PHMSA gas distribution covers the pipeline network from the city gate to the customer meter -- mains and service lines -- serving ~72 million customers across residential, commercial, and industrial uses. The 23 fatalities in 2023 include deaths directly caused by fires, explosions, and other mechanical failures originating on the distribution system; they exclude carbon monoxide deaths from combustion appliances (which occur beyond the meter) and propane/LP-gas incidents (covered by a different regulatory framework). Annual fatalities have ranged roughly 10-30 in recent years. Using 23 / 330,000,000 = 7.0e-8 per year; over 59 years: 1 - (1 - 7.0e-8)^59 ≈ 4.1e-6. This is the natural-gas-only lower bound; the entry's central estimate adds residential LP-gas deaths.\n",
      "independence_note": "PHMSA data covers natural gas distribution infrastructure incidents only; does not overlap with NFPA's LP-gas residential fire data, which tracks fire ignition inside structures regardless of whether the gas reached the home via a distribution main or a propane tank.\n"
    },
    {
      "url": "https://www.propane101.com/propanestatistics.htm",
      "title": "Propane Statistics -- Usage, Fire and Safety Statistics",
      "publisher": "Propane 101 (citing NFPA 2012-2016 data)",
      "source_type": "reputable_reference",
      "statistic": "Annual average of 2,900 residential fires with LP-gas as first material ignited; 25 civilian deaths per year; 155 civilian injuries per year (NFPA, 2012-2016)",
      "excerpt": "\"Residential structure fires with LP-Gas as first material ignited: 2,900. Civilian deaths: 25 per year. Civilian injuries: 155 per year.\"\n",
      "source_date": "2018-01-01",
      "source_accessed": "2026-05-10",
      "archive_url": "http://web.archive.org/web/20230810155241/https://www.propane101.com/propanestatistics.htm",
      "calculation_notes": "NFPA's 2012-2016 propane-fires data gives 25 LP-gas-related residential fire deaths per year. This covers only home structure fires where propane was the first material ignited and is a residential-only count. Adding propane's ~25/year to PHMSA natural gas distribution's ~23/year gives a combined fuel-gas total of ~48/year, from which a small overlap (PHMSA distribution incidents that ignite a home structure and are also captured in NFPA NFIRS data) is removed to arrive at the ~40/year central estimate. 25 / 330,000,000 = 7.6e-8; 59-year lifetime: 1 - (1 - 7.6e-8)^59 ≈ 4.5e-6 (LP-gas component alone).\n",
      "independence_note": "NFPA's propane fire data is drawn from the National Fire Incident Reporting System (NFIRS) and NFPA's own fire department survey -- a different data pipeline from PHMSA's incident reporting system. Partial overlap possible where a distribution-system rupture initiates a residential structure fire.\n"
    },
    {
      "url": "https://www.nfpa.org/education-and-research/research/nfpa-research/fire-statistical-reports",
      "title": "NFPA Fire Statistical Reports -- Research Portal",
      "publisher": "National Fire Protection Association (NFPA)",
      "source_type": "reputable_reference",
      "statistic": "NFPA publishes specialized reports on natural gas and LP-gas fires; gas ignited an estimated 4,200 home fires per year in the US in recent study periods",
      "excerpt": "\"NFPA's research portal publishes specialized reports on hazardous materials fires including natural gas and propane, drawing on NFIRS data and NFPA's annual survey of US fire departments.\"\n",
      "source_date": "2024-01-01",
      "source_accessed": "2026-05-10",
      "archive_url": "http://web.archive.org/web/20260506093358/https://www.nfpa.org/education-and-research/research/nfpa-research/fire-statistical-reports",
      "calculation_notes": "Used as the authoritative institutional anchor for NFPA's fire-statistics methodology and for the \"~4,200 gas-ignited home fires per year\" background figure that contextualizes the ~40-deaths-per-year estimate. The low death rate relative to fire count (less than 1% case fatality) reflects that most gas-ignited residential fires are detected and extinguished or evacuated before fatalities occur.\n",
      "independence_note": "NFPA compiles NFIRS plus its own survey; partially overlaps with PHMSA incident data for any distribution-system failure that initiates a structure fire. Used here as the methodological backbone for LP-gas residential fire death estimates, not as a third independent estimate.\n"
    }
  ],
  "comparison_anchors": [],
  "personal_factor_multipliers": [
    {
      "factor": "No gas appliances in home (all-electric)",
      "multiplier": 0.05,
      "notes": "A household with no natural gas or propane service has effectively zero on-site ignition risk from fuel-gas; residual exposure is limited to gas infrastructure under the street. Multiplier is a strong protective factor.\n"
    },
    {
      "factor": "Propane (LP-gas) vs. natural gas supply",
      "multiplier": 2.5,
      "notes": "Propane is heavier than air and pools at floor level in enclosed spaces, making explosion risk higher for a given leak volume than with natural gas (methane), which is lighter than air and disperses upward. Rural and off-grid households on propane tanks carry higher risk than grid-supplied natural gas customers.\n"
    },
    {
      "factor": "Gas leak detector/alarm installed near appliances",
      "multiplier": 0.35,
      "notes": "Combustible-gas detectors (calibrated for methane or propane) provide early warning of accumulations below the lower explosive limit, allowing evacuation and ventilation before a dangerous concentration is reached. Effect-size estimate based on analogy with smoke alarm data.\n"
    },
    {
      "factor": "Age of gas appliances and fittings > 20 years",
      "multiplier": 2,
      "notes": "Older flexible connectors, valves, and burner assemblies carry higher failure rates from corrosion, fatigue, and connection degradation. PHMSA incident data consistently shows aging infrastructure as a leading cause of gas distribution failures.\n"
    },
    {
      "factor": "Regular professional appliance inspection and maintenance",
      "multiplier": 0.5,
      "notes": "Annual inspection of furnace heat exchangers, gas lines, and appliance connections by a qualified technician catches deteriorating components before they fail. Effect size estimated from general maintenance-intervention literature.\n"
    }
  ],
  "short_label": "Residential gas leak",
  "myth_framing": "overrated",
  "outcome_severity": "fatal",
  "exposure_pattern": "recurring",
  "outcome_type": "death",
  "valence": "negative",
  "caveats": "This entry covers fire and explosion deaths from residential fuel-gas leaks only -- natural gas (methane) supplied by the distribution network and LP-gas (propane) from tanks. It does NOT include carbon monoxide asphyxiation from incomplete combustion of gas appliances, which is a much larger mortality category covered in a separate entry (carbon-monoxide-poisoning). PHMSA distribution data covers the pipeline up to the customer meter and includes commercial customers; the residential-only fraction is not separately published but is thought to represent a majority of incidents. NFPA LP-gas fire data (2012-2016 period) predates the most recent years; the annual death count from this source may have shifted modestly. The combined ~40/year central estimate carries meaningful uncertainty given data-stream overlap and different study-period vintages; the range 25-60 deaths/year is plausible given source variation. The normalized figure assumes a US adult is equally exposed across all 59 remaining years, which overstates risk for apartment dwellers without gas service and understates it for rural propane-dependent households.\n",
  "quality_score": {
    "d1": 4,
    "d2": 5,
    "d3": 4,
    "d4": 4,
    "d5": 5,
    "d6": 4,
    "d7": 4,
    "d8": 5,
    "avg": 4.375,
    "scored_by": "claude-code-8d",
    "scored_at": "2026-05-25",
    "methodology_version": "1.2"
  },
  "reviewer": "8d-eval-2026-05-10",
  "last_reviewed": "2026-05-10",
  "reviewed": true,
  "generated_at": "2026-05-10",
  "image": {
    "alt": "A single residential gas meter mounted on an exterior wall, flat vector illustration."
  },
  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
  "support": "https://buymeacoffee.com/kgluszczyk?via=likelier&utm_content=api-fear-single",
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}