Under the Maricopa County code, a public gathering without enough permanent toilets needs at least one portable toilet per 100 attendees within 200 feet, and the Health Officer can require more. That is a floor. Heat, alcohol, long hours and accessible units usually push the real number higher.
Key takeaways
- The Maricopa County code asks for at least one toilet per 100 attendees within 200 feet of a public gathering that lacks adequate permanent toilets, or as the Health Officer requires.
- At events where food is sold or given away, the county asks organizers to register 30 days ahead, to state the number of toilets, and to keep toilets 25 feet from food vendors.
- The county ratio is a minimum; hot weather, alcohol, long hours and families with children are reasons to plan above it, and accessible units come in addition to the count.
- Large Valley events plan toilets as infrastructure: more than 3,000 portable bathrooms were brought in for the 2024 WM Phoenix Open, according to a local television report.
- Place units in banks near entrances, food and the crowd, not in one cluster, and agree servicing in writing with the provider.
What does Maricopa County say about unit counts?
The county code asks for at least one portable toilet per 100 attendees, within 200 feet of the gathering, at public gatherings without adequate permanent toilets, or as the Health Officer requires. Construction sites are separate, at one per 20 people. Confirm the current figure with the county.
Those figures come from Maricopa County Environmental Health Code, Chapter 2 Section 6. The copy we found is dated 2011, so it may have been amended since. The code also sets unit standards: smooth, nonabsorbent floors, a vented tank and bowl, and light-coloured, easily cleaned seats, walls and ceilings.
Cities add their own rules for events on public streets and in parks, and a venue contract can add more. We have not confirmed rules for individual Valley cities, so ask the city's special events office as well as the county.
Treat the county figure as the start of the conversation rather than the end of it. Event organizers who count only the minimum tend to find out on the day that a floor is not a comfort level. A provider who has worked Valley events can say what number tends to keep a queue short for your kind of crowd, and the answer belongs in the written quote.
How many toilets does that mean for common crowd sizes?
At one per 100 attendees, 500 people need at least 5 toilets, 2,000 need 20 and 10,000 need 100. These are minimums worked out from the county figure, not recommendations. Most organizers plan well above them for long, hot or alcohol-serving events.
The planning column is deliberately loose. No source we have confirmed gives a single multiplier for Phoenix events, so the honest advice is to ask a provider what it would put out and to plan above the floor.
| Attendees | County minimum (1 per 100) | Ask the provider about |
|---|---|---|
| 100 | 1 | At least 2 if the event is hot, long or serves alcohol, plus one accessible unit |
| 500 | 5 | A bank of 8 to 10, with accessible units and handwash stations |
| 2,000 | 20 | Several banks, 30 or more, with service during the event |
| 10,000 | 100 | A site plan from the provider and the organizer's sanitation lead |
What makes a Valley event need more than the minimum?
Heat, alcohol, long hours, families with children and a crowd that arrives all at once. A Cactus League game day reached 105 F with about 78,638 fans across the ballparks in 2026, according to the season attendance report. Peaks, not averages, decide queue length.
A festival with a steady crowd over twelve hours is easier on toilets than a concert where everyone leaves at once. Ask when your peaks are: the end of a ceremony, half-time, the finish of a race, the close of a headline act.
Hot weather makes people drink more, which means more visits. Alcohol does the same. The heat guide and the spring training and festival planning guide go further.
One more reason to go above the minimum is that people do not arrive evenly. The ten minutes after a ceremony ends, a game finishes or a headline act leaves the stage can produce more visits than the previous two hours combined. A provider who sees your schedule by the hour can tell you where the pinch points will be.
How do accessible units and handwash stations fit into the count?
Accessible units are in addition to standard cabins, not instead of them, and handwash stations sit beside every bank. How many accessible units is a question for the provider, the permit office and the venue. Units that cannot be reached on firm ground do not help.
Place accessible units on hard, level ground close to the main walkway, spread through the site rather than clustered. See the ADA units page for what to ask a provider.
If food is served, the county has a temporary handwash set-up with an insulated potable water container of at least 5 gallons, a wastewater catch basin 15 percent larger, soap, paper towels, a free-flow spigot and warm water of about 100 F. The handwash page covers it.
Handwashing is the part that gets cut when the budget tightens. Resist that. A bank of toilets with no way to wash is the first thing a county inspector or a guest will notice at an event with food, and a station is a small cost beside the rest of the plan.
How big do the Valley's biggest events get?
Very big. The 2024 WM Phoenix Open brought in more than 3,000 portable bathrooms, a Cactus League season drew 1,753,849 fans in 2026, and Tempe Festival of the Arts quotes crowds of 150,000 to 250,000 a weekend. Those are organizer or report figures, not audited counts.
Single-day attendance at the WM Phoenix Open has topped 200,000, with a record of 201,003 on February 6, 2016, though reports of the full week conflict, so we quote none. Barrett-Jackson at WestWorld drew about 300,000 spectators in 2023, according to a classic-car journal report.
These numbers are not a guide to your event. They show that at scale, toilets are planned as a system with banks, servicing routes and a schedule, and that the same habits help a smaller event.
What can stadium events teach a smaller organizer?
State Farm Stadium in Glendale has 63,400 seats, expanded to about 73,000 for Super Bowl LVII on February 12, 2023, and the Westgate district nearby says it holds more than 250 events a year. Crowds that size depend on permanent facilities plus temporary ones.
Desert Diamond Arena in the same district holds about 18,000. Those venues have their own restrooms, and temporary toilets matter around them: fan zones, tailgate lots, parking fields and festival areas. Ballpark capacities for Cactus League parks differ between sources, so we quote none as exact.
The lesson for a smaller event is about layout rather than numbers. Crowds gather at entrances, food and exits, and toilets belong there, in banks, within reach of every part of the footprint.
Heat adds one more point to servicing: a unit serviced at nine in the morning in March is a different matter from a unit serviced at nine in July. Ask the provider how its schedule changes with the season, and read the summer heat guide if your event falls between May and October.
How should servicing work during the event?
Agree service times with the provider before the event: a visit before the gates open, and for long or large events another between peaks. The truck needs a route that avoids the crowd. Heat adds a reason for tighter servicing, and no visit time is promised before the provider confirms.
A unit that is clean at ten o'clock can be a different story at three, and the crowd notices. For one-day events with a few hundred people, a pre-event service is usually enough. For multi-day events and big crowds, ask for daily visits and a restock plan.
Tell the provider about the barricades, the credential checks and the hours the roads are closed. A route that works on a normal day may be blocked on yours. Ask who to call on site if something goes wrong, and pass that number to your volunteers.
What do organizers most often get wrong?
They count only attendees, forget staff and vendors, cluster the units in one corner, leave out accessible units and handwashing, and book late. Each is easy to avoid by writing down headcount by hour, drawing the footprint and starting the county and city conversations early.
None of these is exotic. They show up at school fairs and at big festivals, and they are fixed by a one-page plan that the organizer and the provider both read.
A site walk catches things a map misses: a gate that is narrower than it looks, a sprinkler line, a slope, a spot that floods. If you cannot walk it together, a short video or a set of photos works.
Walk it again once the units are in place. Moving a unit ten feet on the morning of the event is easy; moving it after the crowd arrives is not.
- Counting only paying guests, not staff, vendors and volunteers
- Putting every unit at one end of the site
- Forgetting that food events need handwashing and a 25-foot gap from vendors
- Leaving the county registration until the last two weeks, when it is requested 30 days ahead
- Not telling the provider about closures, gates and truck access
Frequently asked questions
Is one toilet per 100 people enough?
It is the county minimum for a public gathering without enough permanent toilets, and many events plan above it. Heat, alcohol and long hours are reasons to add units.
Do I count staff and vendors?
Usually yes. People who work the event use the toilets too, so include them in the headcount and consider a separate bank for them.
How many accessible units do I need?
There is no single figure we can give. The provider, the venue and the permit office advise, and the number should go in the written quote.
Where should the toilets go?
In banks near entrances, food and the crowd, within 200 feet of the gathering, on firm ground, off fire lanes and clear of food vendors by 25 feet.
Who decides the final number?
The organizer, with the county, the city and the venue. The provider recommends a number but does not certify that it meets a rule.
Sources
- Maricopa County Environmental Health Code, Chapter 2 Section 6 – Chemical Toilets, Portable Restroom Units, Portable Waste Holding Tanks (PDF)
- Wikipedia – Westgate Entertainment District
- University of Florida – Spring training scorecard: grading Arizona's Cactus League venues
This guide is general information for Maricopa County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.