Trick or Treatment

Do you want to celebrate Halloween while you learn about the environment and get to do fun activities? Look no further! Prince William Water is hosting the annual Trick or Treatment event from 10 a.m. to 2 p.m. on Saturday, October 26, at the H.L. Mooney Advanced Wastewater Reclamation Facility in Woodbridge.

Trick-or-treat your way around tables hosted by local environmental organizations, learn about wastewater treatment and the environment, and have a chance to take a tour of a real wastewater facility. Trust us-it's cool!

Costumes are optional but encouraged! Please refrain from any costumes that may be seen as offensive or include a weapon.

All goblins and ghouls are welcome!

Watch this page for more spine-chilling 2025 event information!

 If you are an environmental or community organization in Prince William County and would like to host a table dedicated to your mission, please complete the registration form here and someone will reach out to you!