{
  "id": "radon-test-results-by-zip-dupage-kane-will",
  "title": "Radon Test Results by ZIP Code — DuPage, Kane and Will Counties",
  "description": "Licensed radon measurement results submitted to IEMA-OHS, aggregated by ZIP code for DuPage, Kane and Will counties: tests, share at or above 4.0 pCi/L, median, mean and maximum.",
  "version": "1.0.0",
  "status": "published",
  "provenance": "public-source",
  "license": "CC BY 4.0 — reuse with attribution to Radon Connect and a link to the dataset page.",
  "published": "2026-09-02",
  "canonical": "https://radonconnect.com/datasets/radon-test-results-by-zip-dupage-kane-will/",
  "schema": [
    {
      "key": "county",
      "label": "County",
      "type": "string",
      "description": "County as recorded on the measurement (a ZIP that straddles a county line appears once per county)."
    },
    {
      "key": "zip",
      "label": "ZIP code",
      "type": "string",
      "description": "Five-digit ZIP code of the tested address."
    },
    {
      "key": "tests",
      "label": "Valid tests",
      "type": "number",
      "unit": "tests",
      "description": "Licensed measurements IEMA-OHS recorded as valid, in homes without a mitigation system at the time of the test."
    },
    {
      "key": "shareAtOrAbove4",
      "label": "Share at or above 4.0 pCi/L",
      "type": "number",
      "unit": "percent",
      "description": "Percentage of those tests at or above the EPA action level of 4.0 pCi/L."
    },
    {
      "key": "medianPciL",
      "label": "Median result",
      "type": "number",
      "unit": "pCi/L",
      "description": "The 50th percentile of results in the ZIP — the better summary of a typical home."
    },
    {
      "key": "meanPciL",
      "label": "Mean result",
      "type": "number",
      "unit": "pCi/L",
      "description": "Arithmetic mean; pulled upward by a small number of very high results."
    },
    {
      "key": "maxPciL",
      "label": "Highest result",
      "type": "number",
      "unit": "pCi/L",
      "description": "The single highest valid result recorded in the ZIP."
    }
  ],
  "methodology": {
    "question": "What have licensed radon tests found, ZIP by ZIP, in DuPage, Kane and Will counties?",
    "construction": [
      "On 2 September 2026 the public ArcGIS feature service behind the IEMA-OHS Public Radon Dashboard (Radon_Full/FeatureServer/0, \"RadonLicensedMeasurements\", 544,664 rows statewide) was queried for grouped statistics per ZIP: the count of results, their mean, their maximum, their 50th percentile, and the count of results at or above 4.0 pCi/L.",
      "Share at or above 4.0 pCi/L is the second count divided by the first, in percent, rounded to one decimal place. Results are rounded to one decimal place.",
      "No individual measurement, address, licensee name or device serial number was requested or stored; the service was asked only for aggregates."
    ],
    "inclusion": [
      "Measurements whose county is Du Page, Kane or Will, whose InvalidReason is N (recorded as valid) and whose HasMigationSystem is N (no mitigation system present at the time of the test).",
      "ZIP codes with at least 20 such measurements. Smaller ZIPs are excluded because a handful of tests does not describe a ZIP.",
      "A ZIP that straddles a county line appears once per county, carrying only that county’s measurements."
    ],
    "limitations": [
      "These are results from tests performed by licensed professionals and reported to the state. Homeowner self-test kits are not in the service, so the sample leans toward real-estate transactions and follow-up testing.",
      "The service exposes no machine-readable test date, so the period covered is not computed here. IEMA-OHS describes the dashboard as the licensed measurements submitted to it, and its description governs.",
      "A ZIP statistic predicts nothing about any single house. Neighbouring homes routinely test on opposite sides of 4.0 pCi/L; only a test of the house in question answers for that house.",
      "The mean is pulled upward by a small number of very high results; the median is the better summary of a typical home in the ZIP.",
      "IEMA-OHS has not reviewed this table. Any aggregation error is ours; the underlying records are the agency’s."
    ]
  },
  "rowCount": 98,
  "rows": [
    {
      "county": "DuPage",
      "zip": "60540",
      "tests": 3690,
      "shareAtOrAbove4": 47.9,
      "medianPciL": 3.8,
      "meanPciL": 5.4,
      "maxPciL": 74.5
    },
    {
      "county": "DuPage",
      "zip": "60137",
      "tests": 2773,
      "shareAtOrAbove4": 41.5,
      "medianPciL": 3.3,
      "meanPciL": 5.1,
      "maxPciL": 154.2
    },
    {
      "county": "DuPage",
      "zip": "60189",
      "tests": 2384,
      "shareAtOrAbove4": 48.3,
      "medianPciL": 3.8,
      "meanPciL": 5.6,
      "maxPciL": 58.7
    },
    {
      "county": "DuPage",
      "zip": "60126",
      "tests": 2312,
      "shareAtOrAbove4": 32.4,
      "medianPciL": 2.8,
      "meanPciL": 3.9,
      "maxPciL": 52.2
    },
    {
      "county": "DuPage",
      "zip": "60563",
      "tests": 1945,
      "shareAtOrAbove4": 44.5,
      "medianPciL": 3.5,
      "meanPciL": 4.9,
      "maxPciL": 94.6
    },
    {
      "county": "DuPage",
      "zip": "60565",
      "tests": 1843,
      "shareAtOrAbove4": 48.6,
      "medianPciL": 3.8,
      "meanPciL": 5.5,
      "maxPciL": 68.5
    },
    {
      "county": "DuPage",
      "zip": "60187",
      "tests": 1679,
      "shareAtOrAbove4": 44.1,
      "medianPciL": 3.5,
      "meanPciL": 5,
      "maxPciL": 51.2
    },
    {
      "county": "DuPage",
      "zip": "60521",
      "tests": 1670,
      "shareAtOrAbove4": 35.6,
      "medianPciL": 3,
      "meanPciL": 4.1,
      "maxPciL": 34.1
    },
    {
      "county": "DuPage",
      "zip": "60502",
      "tests": 1575,
      "shareAtOrAbove4": 31.4,
      "medianPciL": 2.8,
      "meanPciL": 3.6,
      "maxPciL": 33.2
    },
    {
      "county": "DuPage",
      "zip": "60148",
      "tests": 1553,
      "shareAtOrAbove4": 38.1,
      "medianPciL": 3.1,
      "meanPciL": 4.6,
      "maxPciL": 57
    },
    {
      "county": "DuPage",
      "zip": "60515",
      "tests": 1550,
      "shareAtOrAbove4": 43,
      "medianPciL": 3.5,
      "meanPciL": 5.2,
      "maxPciL": 56.1
    },
    {
      "county": "DuPage",
      "zip": "60532",
      "tests": 1333,
      "shareAtOrAbove4": 48.3,
      "medianPciL": 3.8,
      "meanPciL": 6,
      "maxPciL": 56.4
    },
    {
      "county": "DuPage",
      "zip": "60504",
      "tests": 1306,
      "shareAtOrAbove4": 33.2,
      "medianPciL": 2.6,
      "meanPciL": 3.8,
      "maxPciL": 46.3
    },
    {
      "county": "DuPage",
      "zip": "60516",
      "tests": 1255,
      "shareAtOrAbove4": 44.2,
      "medianPciL": 3.6,
      "meanPciL": 5.1,
      "maxPciL": 48.6
    },
    {
      "county": "DuPage",
      "zip": "60517",
      "tests": 944,
      "shareAtOrAbove4": 38.7,
      "medianPciL": 2.9,
      "meanPciL": 4.4,
      "maxPciL": 36.5
    },
    {
      "county": "DuPage",
      "zip": "60103",
      "tests": 914,
      "shareAtOrAbove4": 34.7,
      "medianPciL": 2.8,
      "meanPciL": 4.3,
      "maxPciL": 65
    },
    {
      "county": "DuPage",
      "zip": "60185",
      "tests": 901,
      "shareAtOrAbove4": 50.1,
      "medianPciL": 4,
      "meanPciL": 5.5,
      "maxPciL": 81.2
    },
    {
      "county": "DuPage",
      "zip": "60108",
      "tests": 894,
      "shareAtOrAbove4": 32.4,
      "medianPciL": 2.3,
      "meanPciL": 4.1,
      "maxPciL": 37.4
    },
    {
      "county": "DuPage",
      "zip": "60561",
      "tests": 888,
      "shareAtOrAbove4": 38.6,
      "medianPciL": 3.2,
      "meanPciL": 4.5,
      "maxPciL": 57
    },
    {
      "county": "DuPage",
      "zip": "60527",
      "tests": 874,
      "shareAtOrAbove4": 37.6,
      "medianPciL": 3.2,
      "meanPciL": 4.6,
      "maxPciL": 42
    },
    {
      "county": "DuPage",
      "zip": "60188",
      "tests": 862,
      "shareAtOrAbove4": 28.5,
      "medianPciL": 2.5,
      "meanPciL": 3.6,
      "maxPciL": 99.1
    },
    {
      "county": "DuPage",
      "zip": "60564",
      "tests": 854,
      "shareAtOrAbove4": 32.8,
      "medianPciL": 3,
      "meanPciL": 3.9,
      "maxPciL": 34.6
    },
    {
      "county": "DuPage",
      "zip": "60514",
      "tests": 749,
      "shareAtOrAbove4": 33,
      "medianPciL": 2.9,
      "meanPciL": 4.1,
      "maxPciL": 40.7
    },
    {
      "county": "DuPage",
      "zip": "60190",
      "tests": 734,
      "shareAtOrAbove4": 46,
      "medianPciL": 3.5,
      "meanPciL": 5,
      "maxPciL": 48.7
    },
    {
      "county": "DuPage",
      "zip": "60181",
      "tests": 728,
      "shareAtOrAbove4": 30.2,
      "medianPciL": 2.6,
      "meanPciL": 3.6,
      "maxPciL": 36.5
    },
    {
      "county": "DuPage",
      "zip": "60559",
      "tests": 722,
      "shareAtOrAbove4": 36.1,
      "medianPciL": 3,
      "meanPciL": 4.3,
      "maxPciL": 42.4
    },
    {
      "county": "DuPage",
      "zip": "60523",
      "tests": 613,
      "shareAtOrAbove4": 36.1,
      "medianPciL": 3,
      "meanPciL": 4.5,
      "maxPciL": 66
    },
    {
      "county": "DuPage",
      "zip": "60172",
      "tests": 453,
      "shareAtOrAbove4": 39.3,
      "medianPciL": 3.1,
      "meanPciL": 5,
      "maxPciL": 63.5
    },
    {
      "county": "DuPage",
      "zip": "60101",
      "tests": 440,
      "shareAtOrAbove4": 34.1,
      "medianPciL": 2.9,
      "meanPciL": 4.5,
      "maxPciL": 66.2
    },
    {
      "county": "DuPage",
      "zip": "60555",
      "tests": 419,
      "shareAtOrAbove4": 41.3,
      "medianPciL": 3,
      "meanPciL": 5.3,
      "maxPciL": 34.8
    },
    {
      "county": "DuPage",
      "zip": "60139",
      "tests": 260,
      "shareAtOrAbove4": 20.4,
      "medianPciL": 1.9,
      "meanPciL": 3.1,
      "maxPciL": 23.2
    },
    {
      "county": "DuPage",
      "zip": "60143",
      "tests": 230,
      "shareAtOrAbove4": 47,
      "medianPciL": 3.6,
      "meanPciL": 5.1,
      "maxPciL": 32.4
    },
    {
      "county": "DuPage",
      "zip": "60133",
      "tests": 173,
      "shareAtOrAbove4": 22,
      "medianPciL": 1.9,
      "meanPciL": 2.8,
      "maxPciL": 17.3
    },
    {
      "county": "DuPage",
      "zip": "60191",
      "tests": 167,
      "shareAtOrAbove4": 31.1,
      "medianPciL": 2.8,
      "meanPciL": 3.6,
      "maxPciL": 16.2
    },
    {
      "county": "DuPage",
      "zip": "60439",
      "tests": 147,
      "shareAtOrAbove4": 39.5,
      "medianPciL": 2.9,
      "meanPciL": 4.6,
      "maxPciL": 47.7
    },
    {
      "county": "DuPage",
      "zip": "60106",
      "tests": 143,
      "shareAtOrAbove4": 27.3,
      "medianPciL": 2.5,
      "meanPciL": 3.5,
      "maxPciL": 27
    },
    {
      "county": "DuPage",
      "zip": "60184",
      "tests": 91,
      "shareAtOrAbove4": 61.5,
      "medianPciL": 5,
      "meanPciL": 5.9,
      "maxPciL": 17.2
    },
    {
      "county": "DuPage",
      "zip": "60157",
      "tests": 70,
      "shareAtOrAbove4": 48.6,
      "medianPciL": 3.8,
      "meanPciL": 5.8,
      "maxPciL": 33.6
    },
    {
      "county": "DuPage",
      "zip": "60440",
      "tests": 44,
      "shareAtOrAbove4": 18.2,
      "medianPciL": 1.8,
      "meanPciL": 2.9,
      "maxPciL": 17.9
    },
    {
      "county": "DuPage",
      "zip": "60174",
      "tests": 36,
      "shareAtOrAbove4": 8.3,
      "medianPciL": 1.7,
      "meanPciL": 1.9,
      "maxPciL": 6.2
    },
    {
      "county": "Kane",
      "zip": "60134",
      "tests": 3231,
      "shareAtOrAbove4": 43.7,
      "medianPciL": 3.4,
      "meanPciL": 5.3,
      "maxPciL": 89.2
    },
    {
      "county": "Kane",
      "zip": "60174",
      "tests": 2183,
      "shareAtOrAbove4": 49.4,
      "medianPciL": 3.9,
      "meanPciL": 5.3,
      "maxPciL": 71.9
    },
    {
      "county": "Kane",
      "zip": "60175",
      "tests": 2125,
      "shareAtOrAbove4": 44.4,
      "medianPciL": 3.6,
      "meanPciL": 5.9,
      "maxPciL": 1403
    },
    {
      "county": "Kane",
      "zip": "60510",
      "tests": 1944,
      "shareAtOrAbove4": 49.8,
      "medianPciL": 3.9,
      "meanPciL": 5.8,
      "maxPciL": 61.8
    },
    {
      "county": "Kane",
      "zip": "60506",
      "tests": 1169,
      "shareAtOrAbove4": 51.8,
      "medianPciL": 4.1,
      "meanPciL": 5.5,
      "maxPciL": 64
    },
    {
      "county": "Kane",
      "zip": "60542",
      "tests": 904,
      "shareAtOrAbove4": 37.9,
      "medianPciL": 3.1,
      "meanPciL": 4.3,
      "maxPciL": 30.1
    },
    {
      "county": "Kane",
      "zip": "60177",
      "tests": 896,
      "shareAtOrAbove4": 47.4,
      "medianPciL": 3.8,
      "meanPciL": 5.1,
      "maxPciL": 59.2
    },
    {
      "county": "Kane",
      "zip": "60119",
      "tests": 709,
      "shareAtOrAbove4": 49.9,
      "medianPciL": 3.9,
      "meanPciL": 5.5,
      "maxPciL": 44.1
    },
    {
      "county": "Kane",
      "zip": "60554",
      "tests": 684,
      "shareAtOrAbove4": 66.8,
      "medianPciL": 5.4,
      "meanPciL": 6.9,
      "maxPciL": 41.7
    },
    {
      "county": "Kane",
      "zip": "60123",
      "tests": 598,
      "shareAtOrAbove4": 50.2,
      "medianPciL": 4,
      "meanPciL": 5.7,
      "maxPciL": 44.8
    },
    {
      "county": "Kane",
      "zip": "60124",
      "tests": 585,
      "shareAtOrAbove4": 41.7,
      "medianPciL": 3.3,
      "meanPciL": 4.9,
      "maxPciL": 43
    },
    {
      "county": "Kane",
      "zip": "60118",
      "tests": 367,
      "shareAtOrAbove4": 59.1,
      "medianPciL": 5,
      "meanPciL": 6.9,
      "maxPciL": 51.7
    },
    {
      "county": "Kane",
      "zip": "60140",
      "tests": 316,
      "shareAtOrAbove4": 37.7,
      "medianPciL": 3.2,
      "meanPciL": 4.4,
      "maxPciL": 37.3
    },
    {
      "county": "Kane",
      "zip": "60502",
      "tests": 302,
      "shareAtOrAbove4": 33.4,
      "medianPciL": 3.2,
      "meanPciL": 4.1,
      "maxPciL": 18.6
    },
    {
      "county": "Kane",
      "zip": "60110",
      "tests": 286,
      "shareAtOrAbove4": 38.8,
      "medianPciL": 3,
      "meanPciL": 4.6,
      "maxPciL": 29.7
    },
    {
      "county": "Kane",
      "zip": "60505",
      "tests": 251,
      "shareAtOrAbove4": 42.2,
      "medianPciL": 3.5,
      "meanPciL": 4.6,
      "maxPciL": 87.4
    },
    {
      "county": "Kane",
      "zip": "60102",
      "tests": 227,
      "shareAtOrAbove4": 18.9,
      "medianPciL": 2.1,
      "meanPciL": 2.9,
      "maxPciL": 17.4
    },
    {
      "county": "Kane",
      "zip": "60120",
      "tests": 163,
      "shareAtOrAbove4": 51.5,
      "medianPciL": 4.2,
      "meanPciL": 5.6,
      "maxPciL": 25.6
    },
    {
      "county": "Kane",
      "zip": "60504",
      "tests": 154,
      "shareAtOrAbove4": 42.2,
      "medianPciL": 3.2,
      "meanPciL": 4.6,
      "maxPciL": 23.5
    },
    {
      "county": "Kane",
      "zip": "60142",
      "tests": 134,
      "shareAtOrAbove4": 21.6,
      "medianPciL": 1.7,
      "meanPciL": 2.4,
      "maxPciL": 9.6
    },
    {
      "county": "Kane",
      "zip": "60136",
      "tests": 129,
      "shareAtOrAbove4": 29.5,
      "medianPciL": 2.4,
      "meanPciL": 3.1,
      "maxPciL": 14.1
    },
    {
      "county": "Kane",
      "zip": "60151",
      "tests": 100,
      "shareAtOrAbove4": 56,
      "medianPciL": 4.3,
      "meanPciL": 5.8,
      "maxPciL": 21.1
    },
    {
      "county": "Kane",
      "zip": "60538",
      "tests": 82,
      "shareAtOrAbove4": 48.8,
      "medianPciL": 3.9,
      "meanPciL": 5.2,
      "maxPciL": 33.9
    },
    {
      "county": "Kane",
      "zip": "60184",
      "tests": 71,
      "shareAtOrAbove4": 43.7,
      "medianPciL": 3.8,
      "meanPciL": 5.1,
      "maxPciL": 15.9
    },
    {
      "county": "Kane",
      "zip": "60511",
      "tests": 32,
      "shareAtOrAbove4": 65.6,
      "medianPciL": 5.7,
      "meanPciL": 7.3,
      "maxPciL": 23.1
    },
    {
      "county": "Will",
      "zip": "60564",
      "tests": 3756,
      "shareAtOrAbove4": 34.6,
      "medianPciL": 3,
      "meanPciL": 4,
      "maxPciL": 75
    },
    {
      "county": "Will",
      "zip": "60586",
      "tests": 1761,
      "shareAtOrAbove4": 53.5,
      "medianPciL": 4.3,
      "meanPciL": 5.8,
      "maxPciL": 67.9
    },
    {
      "county": "Will",
      "zip": "60585",
      "tests": 1544,
      "shareAtOrAbove4": 43.8,
      "medianPciL": 3.5,
      "meanPciL": 4.7,
      "maxPciL": 117.6
    },
    {
      "county": "Will",
      "zip": "60565",
      "tests": 1400,
      "shareAtOrAbove4": 45.4,
      "medianPciL": 3.7,
      "meanPciL": 4.9,
      "maxPciL": 35.9
    },
    {
      "county": "Will",
      "zip": "60544",
      "tests": 1155,
      "shareAtOrAbove4": 48.7,
      "medianPciL": 3.8,
      "meanPciL": 6.1,
      "maxPciL": 81.7
    },
    {
      "county": "Will",
      "zip": "60440",
      "tests": 1035,
      "shareAtOrAbove4": 35.8,
      "medianPciL": 2.7,
      "meanPciL": 4.7,
      "maxPciL": 56.5
    },
    {
      "county": "Will",
      "zip": "60490",
      "tests": 959,
      "shareAtOrAbove4": 55.3,
      "medianPciL": 4.6,
      "meanPciL": 6.3,
      "maxPciL": 50.9
    },
    {
      "county": "Will",
      "zip": "60503",
      "tests": 903,
      "shareAtOrAbove4": 33.6,
      "medianPciL": 2.9,
      "meanPciL": 4,
      "maxPciL": 92.1
    },
    {
      "county": "Will",
      "zip": "60423",
      "tests": 663,
      "shareAtOrAbove4": 35.7,
      "medianPciL": 2.9,
      "meanPciL": 4,
      "maxPciL": 29.9
    },
    {
      "county": "Will",
      "zip": "60451",
      "tests": 601,
      "shareAtOrAbove4": 51.6,
      "medianPciL": 4.1,
      "meanPciL": 6.1,
      "maxPciL": 75.6
    },
    {
      "county": "Will",
      "zip": "60446",
      "tests": 575,
      "shareAtOrAbove4": 62.4,
      "medianPciL": 5.1,
      "meanPciL": 7.8,
      "maxPciL": 130
    },
    {
      "county": "Will",
      "zip": "60441",
      "tests": 495,
      "shareAtOrAbove4": 43,
      "medianPciL": 3.4,
      "meanPciL": 5.2,
      "maxPciL": 41.2
    },
    {
      "county": "Will",
      "zip": "60448",
      "tests": 478,
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