Well down until spring 2027: one porta potty for family of five?

One standard portable toilet is not enough for five people using it full-time for months. OSHA 1926.51, which sets minimums for construction crews, requires one toilet per 20 or fewer workers, and you have a family of five living there daily. The holding tank in a standard unit holds 50 to 70 gallons, and it will fill faster with constant use. Weekly service is the industry norm, but for five people living there, you will need service every three to four days to prevent overfilling and odor. Upgrade to a deluxe unit with a flushing bowl and sink or a restroom trailer. A deluxe unit has a larger holding tank and a handwashing sink, which reduces the service frequency needed. A restroom trailer has multiple stalls and sinks but requires level ground, electrical power and a water hookup or fresh water tank servicing. The rental cost increases with the unit type, service frequency and duration. Schedule service visits based on the number of people and usage, not the weekly default.

One standard unit is enough for a family of five. The closest yardstick is OSHA 1926.51 Table D-1, which calls for one toilet when there are 20 or fewer people, and you're well under that. Unit count isn't your problem. Pump schedule is.

We lived off one unit in the driveway for most of our bathroom gut. What worked was starting on weekly service and asking the driver to tell us how full the tank was on the first two visits. If it's getting close to the top before the next stop, move to twice a week. Don't guess, let the tank level decide.

I'd skip the flushing deluxe for a house. It adds a fresh water tank that also has to be refilled, so it doesn't cut your service visits, and it's one more thing to freeze. A trailer needs power, a level pad and water, which is a lot for five people.

Since you're going through winter with no sink, add a handwash station and ask the company what they do for cold weather so nothing freezes solid on you in January.