FEMA guidelines for portable restrooms during a special event

Risks and Hazards Analysis
Toilet facilities for events where alcohol is not available
  Males Female
Patrons Toilets Urinals Sinks Toilets Sinks
<500 1 2 2 6 2
<1000 2 4 4 9 4
<2000 4 8 6 12 6
<3000 6 15 10 18 10
<5000 8 25 17 30 17
           
Toilet facilities for events where alcohol is available
  Males Females
Patrons Toilets Urinals Sinks Toilets Sinks
<500 3 8 2 13 2
<1000 5 10 4 16 4
<2000 9 15 7 18 7
<3000 10 20 14 22 14
<5000 12 30 20 40 20
           
These figure may be reduced for shorter duration events as follows:
  Duration of event Quantity required  
  More than 8 hrs 100%  
  6-8 hrs 80%  
  4-6 hrs 75%  
  Less than 4 hrs 70%