Why does servicing change how many units you really have?
Because OSHA treats a toilet in an unsanitary condition as not counting toward the required minimum, and because a unit nobody will use does nothing for a crowd. A rental plan counts working units, and servicing is what keeps them working.
OSHA 29 CFR 1926.51 sets the construction baseline: one toilet for 20 or fewer workers, one seat and one urinal per 40 workers for larger crews, and per 50 at 200 or more. It also says hand-washing facilities must be near the toilets.
That makes a count on paper only the start. A site that books exactly the minimum and then lets servicing lapse may find itself below the minimum without anyone having removed a unit. See the construction toilet count guide for how the counts are laid out.
This page does not say that any unit meets a given code. It says what the sourced rule says and tells you to ask the provider and your site safety lead about your own case.
What does a servicing visit actually involve?
Typically the provider cleans the unit, empties its waste tank and restocks it, and refills a hand-wash station if there is one. Exact scope varies by provider, so ask what a visit covers and put it in your booking.
The work is done by the provider's own crew with its own equipment. You are not asked to help, and you should not try to. Servicing involves handling waste and chemicals, and it is the provider's job.
What you can do is make the visit possible. Keep a clear path to each unit, make sure a gate is open or that someone can open it, and tell the provider if anything has moved since the last visit.
How often should units be serviced on a job or event?
There is no single answer on this page. For construction, sourced listings mention weekly servicing with a 28-day period. For events, frequency depends on crowd size and duration. Ask the provider what it recommends for your headcount and your hours.
A small crew on a quiet lot is one thing, and a crowd of tens of thousands over a day is another. The Museum Mile Festival on Fifth Avenue between 82nd and 110th Streets runs a single evening of free admission from 6 to 9 p.m., while a carnival like the one on Eastern Parkway stretches across several days.
When the work is long, set a review date. If the headcount has gone up or the units are full by midweek, call the provider and ask about a different schedule. If the project is winding down, ask whether visits can be reduced. Read about long-term rentals for how longer terms are handled.
What about hand-wash stations at food events?
Food vendors at temporary events need toilets and hand-wash sinks under NYC Health Code Article 88, and the sponsor submits the vendor list to the health department at least 30 days before the event. A station that has run dry is not doing its job, so refilling is part of the service plan.
The city's event guide says sponsors must provide and maintain portable chemical toilets, hand-washing sinks with hot and cold running water, and drying facilities for food-service workers and patrons. This page summarizes that wording and does not replace it. Read the guide, and ask your permit office what it expects.
A hand-wash station is its own item, so book it and put its refilling in the service plan. Our hand-wash stations page explains how they work.