Do I need permission to put portable toilets in a San Antonio park?
Almost certainly. City parks, greenways and trailheads are managed by the city, and placing units is usually part of the event permission. This site holds no San Antonio rule, so ask the parks department or the special events office. In an independent city, ask that city instead.
Do not book units and hope. A delivery truck that arrives at a park without permission may be turned away, and you pay for the attempt. Get the permit or the written approval first, then give the provider the details.
Park-specific rules can include limits on vehicles on grass, restrictions near water and requirements about who may deliver. Ask for them in writing.
Where in a park should units stand?
On firm, level ground close to the activity and reachable by a truck, away from the water's edge, creek banks, low branches and the path of a race. A paved lot or a gravel apron beside the pavilion is better than a lawn. The park manager may specify the spot.
At Woodlawn Lake the lake edge and the loop path matter. At Brackenridge Park, mature trees and a busy visitor flow limit options. On the creek greenways, trailhead lots are the natural place.
Soft ground is the common problem. After rain a lawn can swallow a unit's base and trap a truck, so ask about drainage and avoid low spots.
How do summer and the open ground change the plan?
Parks offer shade in patches and little else, and units in direct sun get hot. Place them under trees if the park allows it, plan more frequent servicing, and add a handwash station. San Antonio's first 100 F day averages around 30 June, so a July picnic is a hot-weather rental.
Guests at a park event drink water, stay outside and walk further than they would at a hall. Lines build in heat. Ask the provider about extra visits and whether a unit can be placed in shade.
The heat servicing page explains the options in more detail.
What about the missions and National Park Service land?
The San Antonio Missions National Historical Park is managed by the National Park Service, not the city. Events there follow the Park Service's permit process, and a provider should not assume placement. Ask the Park Service what it allows, and expect rules on vehicles, ground and timing.
Mission Concepcion and Mission San Jose are both part of the park, and the Mission Reach trail passes near them. The Mission San Jose and Mission Concepcion pages cover the local setting.
What can an event organizer do to keep park units tidy?
Put a volunteer in charge of the toilets, check them hourly, keep paper and sanitizer topped up if the provider allows, and call the provider early when a unit is full. A sign pointing to units helps crowds find them. Leave cleaning and emptying to the provider and never use park waste bins for unit waste.
A group event in a park has a natural problem: nobody owns the toilets. A named volunteer who walks past them each hour and reports to the organizer solves it.
Also tell guests where the units are. A map on the program or a simple directional sign keeps people from wandering to the permanent restrooms, which may be locked, and keeps queues short.