Door County, WI – Authorities have identified the man killed in Saturday’s explosion at Harbour Village Resort and Campground in Door County.
According to the Door County Sheriff’s Office, 27-year-old Sean C. Marquardt of Algoma, Wisconsin, died after a large tank exploded around 7:43 a.m. on October 25, 2025.
An autopsy was conducted Monday at the Brown County Medical Examiner’s Office, though results are still pending.
Investigators now believe the blast originated from a 3,000-gallon water tank—not an air tank as first reported. The tank reportedly exploded while water lines were being flushed as part of winterization work at the campground.
The incident remains under active investigation. Sheriff Tammy Sternard said no further information will be released until additional findings are confirmed.
Harbour Village Resort and Campground is located in Carlsville, between Sturgeon Bay and Egg Harbor, a popular seasonal destination in Door County, Wisconsin.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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