Restroom Calculator

Need an estimate for how many porta potties your event needs? Use this handy calculator! For a more specific quote tailored to your needs, call us today at 800-210-8407!

special events calculator
*By completing this calculator, you are consenting to being contacted by On Site for more information


Fresh Flush Mobile Office



Two 250-gallon tanks
One pressure pump
Plumbing connections & fittings
Soap & towel dispensers
Hand sanitizers
Insulated tanks
Water/waste lines insulated & heat tape

The Fresh Flush Mobile Office, provided by On Site Companies, is perfect for construction sites and applications that require a more formal office setting. This system is meant to hook up to the restroom facilities that are already installed into your job site trailer. The Fresh Flush system hooks your job trailer’s bathroom up to fresh and grey water holding tanks to provide standard restroom facilities to your workers and guests to your job site. You can pair the Fresh Flush Restroom System to a SaniSink hot water hand washing sink for hot water hand washing on site.

*Fresh Flush Unit only available in the Minneapolis/ St. Paul, Rochester and Mankato, Minnesota and St. Louis, MIissouri areas

Related Products

On Site Companies can offer you a wide range of portable toilet and sanitation solutions to serve your needs.


I have a special event with an estimated attendees, for hours.
  • Will there be more women than men?
  • Will there be alcohol served?