Trick or Treatment

Children gather in Halloween costumes in front of a spooky banner that reads "Trick or Treatment"

A Scary Good Time for All!

On Saturday, October 24, nearly 500 ghouls and goblins gathered for our 2026 Trick or Treatment event!

Kids and adults donned their best costumes for trick or treating, activities, and tours of the H.L. Mooney Advanced Water Reclamation Facility. Between spooky decorations, mad science experiments, and environmental education, the event offered a frightfully fun way for community members to learn about water and how they can be good stewards of the environment.

Thank you to our partners for making this an unforgettable event!

2026 Trick or Treatment Partners

2026 Trick or Treatment Partners

2026 Trick or Treatment Photos

  • Excited, costumed attendees arrive at 2026 Trick or Treatment by walking through a pumpkin arch.
  • Candy was a major attraction at 2026 Trick or Treatment.
  • Excited attendees pose in front of inflatable pumpkins at 2026 Trick or Treatment.
  • Attendees pose with spooky decorations at Trick or Treatment in October 2026.
  • Costumed event-goers visit the Upper Occoquan Service Authority's table at 2026 Trick or Treatment.
  • Attendees enjoy a tabletop activity at 2026 Trick or Treatment.