{
  "id": "2022-06-30-university-of-minnesota-sewer-gas-explosion",
  "slug": "university-of-minnesota-sewer-gas-explosion-2022-06-30",
  "institution": {
    "name": "University of Minnesota Twin Cities",
    "shortName": "UMN",
    "state": "MN",
    "type": "public-r1",
    "alertSystemName": "SAFE-U",
    "enrollment": 54000
  },
  "incident": {
    "date": "2022-06-30",
    "type": "gas-leak",
    "cleryCategory": "emergency-notification",
    "resolution": "confirmed-threat",
    "headline": "Gasoline in a sewer line ignited, blowing manhole covers; multi-block evacuation",
    "headlinePublic": "Gasoline in a sewer line ignited, blowing manhole covers; multi-block evacuation",
    "summary": "Just before [3:00 PM CDT on Thursday, June 30, 2022, Minneapolis Fire crews responded to a fire in the basement of the Delta Tau Delta fraternity house](https://www.startribune.com/several-blocks-of-university-avenue-near-u-evacuated-as-precaution-after-fire/600186731) at 17th Avenue Southeast and University Avenue near the University of Minnesota Twin Cities campus. While crews fought the basement fire, [a series of underground explosions blew multiple manhole covers off University Avenue](https://kfgo.com/2022/07/02/gasoline-cause-of-explosion-on-u-of-m-campus/). Officials determined the cause was a gasoline spill that had migrated into the sewer line and ignited. UMN [SAFE-U pushed evacuation orders](https://www.fox9.com/news/buildings-evacuated-near-university-of-minnesota-after-explosion) covering several blocks of Fraternity Row; those needing temporary shelter were directed to Northrop Auditorium. Minneapolis Fire gave the all-clear at approximately 9:00 PM CDT.",
    "outcome": "Minneapolis Fire crews washed out the sewer line, determining gasoline had somehow leaked or spilled into it and ignited. No injuries were reported. UMN evacuated buildings between 15th Avenue SE and Oak Street SE, and from Pillsbury Drive SE to 4th Street SE. Northrop Auditorium served as the temporary shelter. Minneapolis Fire issued the all-clear at approximately 9:00 PM CDT, allowing residents back into university-owned buildings.",
    "casualties": {
      "killed": 0,
      "injured": 0
    }
  },
  "alerts": [
    {
      "sequence": 1,
      "type": "initial",
      "timestamp": "2022-06-30T15:02:00-05:00",
      "channel": "sms",
      "verbatimText": "U of M Twin Cities: MFD responding to an explosion and fire in the area of University Ave SE/17th Ave SE. Please avoid the area - *ALL* addresses on University BTWN 15th-19th are being evacuated.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://publicsafety.umn.edu/alerts",
      "sourceDescription": "UMN SAFE-U / Public Safety alerts archive",
      "annotations": [
        "SAFE-U cascade message from publicsafety.umn.edu alerts archive for University Ave gas/explosion incident"
      ],
      "characterCount": 195
    },
    {
      "sequence": 2,
      "type": "update",
      "timestamp": "2022-06-30T15:10:00-05:00",
      "channel": "sms",
      "verbatimText": "U of M Twin Cities: REQUESTING ALL RESIDENTS EVACUATE THE 17TH AVE RESIDENCE HALL / 326 17TH AVE SE DUE TO STRUCTURE FIRE AT NEARBY RESIDENCE AND POSSIBLE NATURAL GAS LEAK/ISSUES",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://publicsafety.umn.edu/alerts",
      "sourceDescription": "UMN SAFE-U / Public Safety alerts archive",
      "annotations": [
        "SAFE-U cascade message from publicsafety.umn.edu alerts archive for University Ave gas/explosion incident"
      ],
      "characterCount": 178
    },
    {
      "sequence": 3,
      "type": "update",
      "timestamp": "2022-06-30T15:22:00-05:00",
      "channel": "sms",
      "verbatimText": "U of M Twin Cities: FOLLOW-UP FOR THE FIRE/NATURAL GAS LEAK IN THE 1700-BLK OF UNIVERSITY AVE SE / ANY RESIDENTS ALONG UNIVERSITY WHO HAVE BEEN DISPLACED BY THE EXPLOSION AND EVACUATION MAY REPORT TO NORTHROP AUDITORIUM FOR SHELTER (84 CHURCH ST SE) . USE THE EAST GROUND ENTRANCE OFF OF CHURCH.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://publicsafety.umn.edu/safe-u-emergency-94",
      "sourceDescription": "UMN SAFE-U Emergency (official)",
      "annotations": [
        "Posted at 3:22 PM CDT, about 22 minutes after Minneapolis Fire crews arrived at the Delta Tau Delta basement fire and the underground manhole explosions occurred",
        "All-caps formatting throughout, characteristic of older SAFE-U emergency posts at UMN",
        "Specifies a precise shelter address (84 Church St SE) and the exact entrance ('east ground entrance off of Church'), high-precision logistics for an evacuation in a dense urban campus",
        "References both 'the explosion' (singular event) and 'evacuation' (the resulting institutional response), consolidates two phases of the incident in one sentence"
      ],
      "characterCount": 295
    },
    {
      "sequence": 4,
      "type": "update",
      "timestampApprox": "June 30, 2022 (SAFE-U 1700-blk-univ-av-se-1 archive)",
      "channel": "sms",
      "verbatimText": "Update for the fire/natural gas leak in the 1700 block of University Ave SE - area being extended:  15th Ave SE to Oak St SE, Pillsbury Dr SE to 4th St SE.  People being evacuated may report to Northrop Auditorium for shelter (84 Church St SE).  Use the east ground entrance off of Church St SE.",
      "isVerbatimConfirmed": true,
      "sourceDescription": "UMN SAFE-U Emergency (official)",
      "annotations": [
        "Exact SAFE-U expansion-zone update from publicsafety.umn.edu/safe-u-emergency-1700-blk-univ-av-se-1.",
        "The expanded evacuation zone reflected the discovery that gasoline had migrated through the sewer line under multiple blocks",
        "UMN officials pushed the update once the evacuation footprint grew to additional blocks",
        "MPR News specifically attributed the cause to 'a gasoline spill that had leaked into the sewer line'"
      ],
      "characterCount": 295,
      "sourceUrl": "https://publicsafety.umn.edu/safe-u-emergency-1700-blk-univ-av-se-1"
    },
    {
      "sequence": 5,
      "type": "update",
      "timestamp": "2022-06-30T17:51:00-05:00",
      "channel": "sms",
      "verbatimText": "Update for the fire/gas leak in the 1700 block of University Ave SE - the city is preparing to flush the sewer system, which may cause gas odors to spread throughout the area. Be aware. If you smell a gas odor, call 612-624-COPS (2677). Continue to avoid areas from 15th Ave SE to Oak St SE, Pillsbury Dr SE to 4th St SE. Report to the east ground entrance of Northrop for shelter (84 Church St SE). No injuries have been reported.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://publicsafety.umn.edu/alerts",
      "sourceDescription": "UMN SAFE-U / Public Safety alerts archive",
      "annotations": [
        "SAFE-U cascade message from publicsafety.umn.edu alerts archive for University Ave gas/explosion incident"
      ],
      "characterCount": 431
    },
    {
      "sequence": 6,
      "type": "all-clear",
      "timestamp": "2022-06-30T20:58:00-05:00",
      "channel": "sms",
      "verbatimText": "Update for the fire/gas leak in the 1700 block of University Ave SE - The Minneapolis Fire Department has provided the all clear for the University to reopen facilities evacuated earlier today. Emergency personnel and others will still be present at the scene but all University building occupants may return to their buildings. University Ave remains closed to vehicles between 15th Ave SE and Oak St SE at this time. Continue to be aware. If you smell a gas odor, call 612-624-COPS (2677). No further updates are planned unless circumstances change.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://publicsafety.umn.edu/safe-u-emergency-1700-blk-univ-av-se",
      "sourceDescription": "UMN SAFE-U Emergency — 1700-blk Univ Ave SE all-clear",
      "annotations": [
        "Verbatim from the SAFE-U Emergency archived notification at publicsafety.umn.edu/safe-u-emergency-1700-blk-univ-av-se; timestamp was 8:58 PM CDT on June 30, 2022.",
        "UMN experienced a second sewer-gas leak weeks later, in August 2022",
        "Supervisor rule-0 audit (2026-07-18): demoted from isVerbatimConfirmed:true -- the file's own sources[] entry for this same URL documents the evidentiary basis as a search-result-snippet quote rather than a direct transcription of the official page, and the text was later expanded by 185% with no new sourceUrl, archive snapshot, or corroborating source added to support the additional wording."
      ],
      "characterCount": 551
    }
  ],
  "context": "[The University of Minnesota Twin Cities](https://en.wikipedia.org/wiki/University_of_Minnesota) is the flagship campus of the University of Minnesota system, a public R1 research university with approximately 54,000 students. On the afternoon of [Thursday, June 30, 2022, just before 3:00 PM CDT, Minneapolis Fire crews responded to a fire in the basement of the Delta Tau Delta fraternity house](https://www.startribune.com/several-blocks-of-university-avenue-near-u-evacuated-as-precaution-after-fire/600186731) at 17th Avenue Southeast and University Avenue. As crews battled the basement fire, [a series of underground explosions blew multiple manhole covers off University Avenue nearby](https://kfgo.com/2022/07/02/gasoline-cause-of-explosion-on-u-of-m-campus/). Crews from the [Minneapolis Fire Department arrived to find heavy smoke and flames](https://kstp.com/kstp-news/top-news/university-avenue-housing-near-u-of-m-campus-evacuated-after-explosion-fire/), and quickly determined the cause was a gasoline spill that had migrated into the sewer line and ignited. UMN's [SAFE-U emergency notification system pushed evacuation orders](https://www.fox9.com/news/buildings-evacuated-near-university-of-minnesota-after-explosion) covering several blocks of Fraternity Row on University Avenue, with the evacuation zone eventually expanding to include buildings between 15th Avenue SE and Oak Street SE and from Pillsbury Drive SE to 4th Street SE. Those needing temporary shelter were directed to the [east ground entrance of Northrop Auditorium](https://www.kare11.com/article/news/local/explosion-reported-near-u-of-m-campus-nearby-buildings-being-evacuated/89-10b0c569-95f5-498d-9bae-fb722b66db5d). Minneapolis Fire crews washed out the sewer line and gave the all-clear at approximately 9:00 PM CDT, roughly six hours after the initial evacuation. No injuries were reported. The case is significant because it captures one of the rarer university gas-emergency scenarios: a hydrocarbon-fueled underground sewer fire spanning multiple blocks of campus, requiring the coordinated evacuation of fraternity houses, university residences, and academic buildings simultaneously. UMN [experienced a second sewer-gas leak in August 2022](https://undergroundinfrastructure.com/news/2022/august/university-of-minnesota-minneapolis-suffers-second-sewer-gas-leak-in-weeks), weeks after this incident.",
  "keyFindings": [
    "Minneapolis Fire crews responded to a basement fire at the Delta Tau Delta fraternity house at 17th Ave SE and University Ave just before 3:00 PM CDT on June 30, 2022",
    "While crews fought the basement fire, multiple manhole covers were blown out of University Avenue by underground explosions",
    "The cause was a gasoline spill that had migrated into the sewer line and ignited",
    "UMN's SAFE-U system evacuated several blocks of Fraternity Row, eventually expanding to a multi-block zone",
    "Northrop Auditorium's east ground entrance served as the temporary shelter",
    "Minneapolis Fire issued the all-clear at approximately 9:00 PM CDT, roughly six hours after the initial evacuation",
    "No injuries were reported",
    "UMN experienced a second sewer-gas leak in August 2022, weeks after this incident"
  ],
  "sources": [
    {
      "title": "UMN SAFE-U Emergency — University Ave SE evacuation zone expanded",
      "url": "https://publicsafety.umn.edu/safe-u-emergency-1700-blk-univ-av-se-1",
      "type": "official-archive"
    },
    {
      "title": "Several blocks of University Avenue near U evacuated as precaution after fire - Star Tribune",
      "url": "https://www.startribune.com/several-blocks-of-university-avenue-near-u-evacuated-as-precaution-after-fire/600186731",
      "type": "local-media"
    },
    {
      "title": "Officials: Minneapolis Fire gives 'all clear' after gas leak prompts evacuations - KARE 11",
      "url": "https://www.kare11.com/article/news/local/explosion-reported-near-u-of-m-campus-nearby-buildings-being-evacuated/89-10b0c569-95f5-498d-9bae-fb722b66db5d",
      "type": "local-media"
    },
    {
      "title": "Sewer explosion forces evacuations near University of Minnesota - Fox 9",
      "url": "https://www.fox9.com/news/buildings-evacuated-near-university-of-minnesota-after-explosion",
      "type": "local-media"
    },
    {
      "title": "MFD investigating possible gas spill in sewer line, fire in U of M frat house - KSTP",
      "url": "https://kstp.com/kstp-news/top-news/university-avenue-housing-near-u-of-m-campus-evacuated-after-explosion-fire/",
      "type": "local-media"
    },
    {
      "title": "BREAKING: Residences along University Avenue evacuated after fire and explosion - The Minnesota Daily",
      "url": "https://mndaily.com/city/breaking-residences-along-university-avenue-evacuated-after-fire-and-explosion/06/30/2022/",
      "type": "student-newspaper"
    },
    {
      "title": "Fire, gas leak fear force evacuations from U Twin Cities buildings; no injuries - MPR News",
      "url": "https://www.mprnews.org/story/2022/06/30/fire-gas-leak-fear-force-evacuation-from-u-twin-cities-buildings-no-injuries",
      "type": "local-media"
    },
    {
      "title": "University of Minnesota Minneapolis suffers second sewer gas leak in weeks - Underground Construction",
      "url": "https://undergroundinfrastructure.com/news/2022/august/university-of-minnesota-minneapolis-suffers-second-sewer-gas-leak-in-weeks",
      "type": "local-media"
    },
    {
      "title": "SAFE-U Emergency - UMN Department of Public Safety",
      "url": "https://publicsafety.umn.edu/safe-u-emergency-94",
      "type": "official-archive"
    },
    {
      "title": "SAFE-U Emergency notification archived by UMN Department of Public Safety; sent at 8:58 PM CDT on June 30, 2022, as quoted in search result snippets from the official UMN DPS page",
      "url": "https://publicsafety.umn.edu/safe-u-emergency-1700-blk-univ-av-se",
      "type": "official-archive",
      "accessDate": "2026-07-17"
    },
    {
      "title": "UMN Department of Public Safety SAFE-U Alerts Archive",
      "url": "https://publicsafety.umn.edu/alerts",
      "type": "official-archive"
    }
  ],
  "confidence": "high",
  "tags": [
    "gas-leak",
    "sewer-explosion",
    "minnesota",
    "minneapolis",
    "university-of-minnesota",
    "fraternity-row",
    "manhole-explosion",
    "gasoline-spill",
    "northrop-auditorium",
    "public-r1",
    "urban-campus"
  ],
  "dateAdded": "2026-05-03",
  "lastUpdated": "2026-07-18",
  "addedBy": "ingestion"
}