How many standard portable toilets does a Chicago job or event need?
Chicago code requires at least 2 toilets at a temporary event with more than 30 people, then 1 more for every additional 300 people, or fraction of 300, above 600. Construction crews need at least 1 per 30 employees. Where city and OSHA numbers differ, the stricter one governs.
For a temporary event, the plumbing code gives the floor. More than 30 people present means at least 2 toilets. Past 600 people, the code adds one toilet for every additional 300, counting any fraction of 300 as a full block. So an event just over 600 needs the base count plus one more, and the next addition comes at 900 and a bit.
For a work site, the Chicago Plumbing Code asks for at least one toilet per 30 employees or fraction of 30. Federal construction rules in OSHA 29 CFR 1926.51 are set differently: one toilet for 20 or fewer workers, then one toilet seat and one urinal per 40 workers once the crew is above 20, and one per 50 once it reaches 200. When the two sets of numbers disagree, plan to the stricter one and confirm with the permit office on your project.
A minimum is a minimum. Most organizers order above it because a crew on a short break or a crowd at a food line produces a wait that the minimum does not cover. See the guide on how many portable toilets a Chicago event needs for worked examples.
Where on a property can a standard unit go?
On private property in Chicago, the plumbing code says nonsewer toilet facilities must be kept sanitary and serviced, and must sit at least 5 feet from property lines. Beyond that, placement depends on firm ground, truck access and where people will actually walk, so describe the site when you call.
A unit near the back lot line is tempting because it is out of the way, but the 5-foot setback applies. Measure from the property line, not from the fence, which may not sit on the line. If you are not sure where the line is, ask before the units arrive rather than after.
Ground matters as much as distance. A level paved surface or packed gravel is easier for a delivery truck than soft grass after rain. Tell the provider about slope, ruts and any ground that turns to mud, and about overhead wires or low branches on the approach.
Think about people, too. Place units where workers or guests can reach them without crossing a vehicle path, and light the approach if the event runs after dark. Do not put units against a wall, fence or exit door that someone might need to open.
What does the provider do, and what do you do?
The provider delivers, places, services and removes the units, and decides how the servicing is carried out. Your part is to describe the site and headcount accurately, keep the approach clear, report a unit that is overfull or damaged, and tell the provider when the job ends.
You do not move a unit, tip it, empty it or try to fix its tank. Those are provider tasks and they involve waste handling that is not safe for an untrained person. If a unit is knocked over, blocked or overfull, call and report it so the provider can respond.
Keep a simple log if you can. Note the delivery date, the number of units and the servicing visits you see. If the plan needs to change because a crew grew or an event added a day, a clear record helps the provider adjust quickly.
When is a standard unit the wrong choice?
A standard unit is the wrong choice when guests include wheelchair users, when the occasion is formal, or when the crowd will stay for many hours. Those cases call for an accessible unit, a flushable trailer or additional handwashing, which the provider can quote alongside standard units.
Wedding guests in formal clothing, a corporate hospitality tent and a long festival day all raise the bar on comfort and cleanliness. A mixed order of standard units, one or more accessible units and a trailer is common.
For public events that need a permit, the permit rules, not your preference, set what must be provided. Read the special event portable toilets page for the Park District and city rules we can state.