Sioux County Sheriff

Drowning near Rock Valley – July 4 *Updated: victim name released*


The Sioux County Sheriff’s Office has released the name of the drowning victim from the incident that occurred on Monday, July 4, at 3:56 p.m.

Aldo Tomas-DeLeon, age 19, of Rock Valley, IA, was the person swimming at the Groeneweg Pond along 290th Street, one mile north of Rock Valley, when he went underwater.


On Monday, July 4, at 3:56 p.m., the Sioux County Sheriff’s Office investigated a drowning that occurred in a pond north of Rock Valley, IA.

Sioux County Communications received a 9-1-1 call reporting a male was swimming in the pond when he went underwater and did not resurface.

Bystanders along with emergency responders located the male after some time and removed him from the water where life-saving measures were attempted; he was flown directly from the area to a Sioux Falls, SD hospital where he was pronounced deceased.

The name of the victim is being withheld pending notification of family.

The sheriff’s office was assisted by the Rock Valley Police Department, Rock Valley Fire Department and Rock Valley Ambulance.