Event Restroom Sizing Guide for Los Angeles Events
The industry baseline for events is one portable restroom per 50 guests for an event running up to four hours, plus 15 to 20 percent more units when alcohol is served, and roughly one ADA accessible unit per 20 standard units.
Event restroom calculator
Industry guidance, not a legal requirement. Los Angeles County publishes no fixed guest-to-unit ratio.
3 standard units + 1 ADA
Based on 150 guests over 4 hours. ADA units are planned at about one per 20 standard units.
Hot weather, heavy food and drink service, and a single peak rush all push real usage above the baseline.
Venue rules and city permits can change what you actually need. Worth a call before you book.
Call (323) 831-1979What the guidance is, and what the law is
These two get conflated constantly, including by rental companies. The ratio is guidance. The county requirement is a standard of adequacy without a published number.
Special events restroom-to-guest ratio guidanceIndustry guidance, not law
The widely used industry baseline is one portable restroom per 50 guests for an event running up to four hours. Add 15 to 20 percent more units when alcohol is served, because consumption and restroom frequency both rise. Plan roughly one ADA accessible unit per 20 standard units, about 5 percent of the total.
Source: Portable Sanitation Association International, Renting Portable Units (verified against the primary source)
LA County Code Title 11, Div. 1, Ch. 11.38, Part 3, Sec. 11.38.570 - Facilities required, business establishments and public gatherings
“It is unlawful for any person to conduct a business or place of public gathering unless there is provided, in a separate room and on the premises, adequate and conveniently located toilet facilities and lavatories.”LA County Code 11.38.570
Los Angeles County requires businesses and places of public gathering to provide adequate, conveniently located toilet facilities. Notably, the section does not publish a numeric persons-per-fixture table - it leaves adequacy to the Director's discretion.
Source: Los Angeles County, LA County Code Sec. 11.38.570 - Facilities required, business establishments and public gatherings (verified against the primary source)
How to size it by hand
- 1
Divide guest count by 50
This gives the baseline unit count for an event running up to four hours.
- 2
Scale up for longer events
An event running eight hours generates substantially more usage than the four-hour baseline assumes.
- 3
Add 15 to 20 percent if alcohol is served
Alcohol raises both consumption and restroom frequency across the whole guest list.
- 4
Add ADA units at about 5 percent
Plan roughly one accessible unit per 20 standard units, with a minimum of one at any public event.
- 5
Check the accessible route
An accessible unit placed on soft ground or away from a connected path does not function as accessible.
Film shoots and West Hollywood events
West Hollywood is the one city in our area where the permit clock, not the truck, sets your lead time. Film permits must be filed at least three business days ahead with the West Hollywood Film Office on (323) 848-6489, and an encroachment permit is required if any part of a street, alley, or public right-of-way is used for construction-related activity.
Answers
Event sizing questions
Still unsure after reading these? Calling is faster than typing.
How many porta potties do I need for 100 guests?
Two units for an event up to four hours, using the one-per-50 industry baseline. Add roughly 15 to 20 percent if alcohol is served, and at least one ADA unit if the event is open to the public.
Is the 1-per-50 ratio a legal requirement in Los Angeles?
No. It is industry guidance from the Portable Sanitation Association International. Los Angeles County Code 11.38.570 requires adequate and conveniently located facilities but publishes no numeric persons-per-fixture table, leaving adequacy to the Director’s discretion.
How many ADA units do I need?
Plan about one accessible unit per 20 standard units, roughly 5 percent of the total, with a minimum of one for public events. Note that renting an accessible unit does not by itself discharge an event operator’s ADA obligations.
Does hot weather change the count?
Yes. Warmer days raise liquid intake and restroom frequency, and sites with heavy food and drink service run above baseline. Build in headroom rather than sizing to the exact minimum.