How does a portable sink station work?
Two tanks do the job: fresh water up top, gray water waste below, and a foot pump or hand pump in between that moves water through the faucet without any plumbing hookup. There is no power cord and no drain line running to the street. You fill the fresh tank, empty the gray tank when it gets close to full, and that is the whole cycle. Boise Porta Pros delivers units already filled, so a crew on a job site off Chinden Boulevard can start washing up within minutes of drop-off. Some stations add a small hot water heater for warm rinse water, useful in cold months, and we cover that setup more on the handwashing station rental page, right next to the hand sanitizer station rental option for sites that need both. For crews applying paint, coatings or pesticides, OSHA 1926.51(f)(1) requires washing facilities on site, and a portable sink station satisfies that without a building nearby. General labor sites still fall under OSHA 1926.51(c), which sets toilet counts by crew size, and a sink station typically sits right next to whatever toilet count that math produces. If you are not sure how many stations your crew needs, the how many porta potties do I need guide walks through the same ratio logic for sinks.
Can a portable sink be used for hair washing?
Yes, and it is one of the more common uses we see beyond job sites. A portable sink for hair works well at outdoor weddings, film sets and multi-day camping events where a shower trailer is overkill but a rinse station is not. The foot pump design leaves both hands free, which matters when someone is bent over a basin trying to wash hair without soaking a sleeve. For film crews we set these up next to the honeywagon area described on the film set restroom rental page, and for weddings they pair naturally with the units on the wedding restroom rental page. A camping portable sink used for hair washing benefits from the hot water option since Boise nights cool off fast even in summer, and pairs well with a camping porta potty setup on the same trip. 29 CFR 1910.141(d)(2) requires soap and towels or a hand drying device at washing facilities, hand sanitizer alone does not meet that standard, so we stock every unit with a soap dispenser and paper towel holder as a baseline, not an add-on.
What size water tank does a portable sink need?
Most job site stations carry a 40 to 60 gallon fresh water tank, roughly matching the 60 to 70 gallon holding tank inside a standard portable toilet, which keeps service intervals consistent between the two units. Portable sink water tanks that size handle a crew of 15 to 20 for several days between refills, depending on how often people wash up. Smaller camping and event units run 5 to 7 gallon tanks meant for one or two days between fills, better suited to a backyard party than a 40-person job site. ANSI/PSAI Z4.3 sets a baseline of one service visit per week for up to 10 users over a standard 40 hour week, and we use that same interval as a starting point when scheduling sink refills alongside toilet servicing. A crew working a home renovation porta potty project inside Boise city limits, or one out toward porta potty rental in Meridian, ID, 10.1 miles west, gets the same tank math applied regardless of address. If your project already has a standard porta potty rental on order, adding a sink station is a short conversation, not a separate delivery in most cases, and the same applies if you are running a deluxe flushable porta potty or an ADA accessible porta potty instead.
Do portable sinks need hot water?
Not always, but plenty of crews ask for it. A hot water portable sink adds a small tank heater or a mixing valve fed by a heated reservoir, and it matters most from late fall through early spring when a job site near Garden City, 6.8 miles northwest of Boise, sees near-freezing mornings. Cold water still satisfies the washing requirement under 29 CFR 1910.141(d)(2), but crews handling food, medical waste or anything greasy tend to want warm water regardless of the rule. Event clients booking a portable restroom rental for an outdoor wedding almost always request the heated option, since guests notice cold water fast, and the same goes for a festival restroom rental or a concert restroom rental booking. We also see the heated units requested for farm and agricultural restrooms setups, where OSHA 1928.110 requires potable water and handwashing within a quarter mile walk of hand-labor employees, and warm water makes that station something workers actually use rather than avoid.
| unit | duration | typical price |
|---|---|---|
| standard toilet | day | $150 |
| standard toilet | week | $200 |
| handwashing station | day | included with delivery fee range |
| ada unit | day | $230 |
Delivery fees for any of these run in the same band whether you are ordering a sink station alone or bundling it with a portable toilet rental order, and the porta potty rental cost page breaks down how delivery and service fees stack for multi-unit orders, while the porta potty rental per day page covers shorter bookings and the monthly porta potty rental page covers longer ones.
How many portable sinks does a job site need?
One station per 15 to 20 workers is a reasonable starting point, matched to the same crew-size logic OSHA 1926.51(c) uses for toilet counts. Larger sites often add a second unit near a food or break area so hand washing does not compete with toilet lines during shift changes, a pattern also covered on the construction site services page.
Can a portable sink freeze in winter?
Yes, standing water in the tank or trap can freeze below roughly 32 degrees. Boise Porta Pros insulates units and offers heated tank options for winter rentals, similar to the cold-weather steps covered on the porta potty in winter page. Draining the gray tank fully between uses also helps prevent ice buildup overnight.
Is a portable sink the same as a handwashing station?
Mostly yes, the terms overlap heavily in the industry. A handwashing station usually emphasizes the pump and soap dispenser setup, while a portable sink description leans toward the basin and faucet. Functionally, both models on our handwashing station rental page work the same way.
Do portable sinks need a permit in Boise?
Placement in a public right of way needs confirming with the city before delivery, since we have not verified a specific rule for sink stations. On private property, a construction lot or backyard event, no permit issue applies. Check the porta potty permit requirements page for the same right-of-way question as it applies to toilets, and see the porta potty placement guide for where units can sit on a lot.
What is the difference between a fresh tank and a gray tank?
The fresh tank holds clean water for washing, the gray tank catches used water and soap runoff underneath the basin. Keeping them separate is what lets the unit work without a plumbing hookup. Gray tanks need emptying before they overflow, typically on the same schedule as the fresh tank refill.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.