Yes, standard units work fine in San Rafael winters, since temperatures rarely drop low enough to freeze a 60 to 70 gallon holding tank overnight. We add extra deodorizer and check tanks more often on cold service days. Rain is the bigger issue here than ice, so placement on stable ground matters more than heating.
Short answer: yes, and most job sites and events in San Rafael run standard portable toilets through the wet season without trouble. The tank holds 60 to 70 gallons, and a unit that size does not freeze solid the way a garden hose does. What actually causes problems is rain pooling around the base, so we look hard at porta potty placement before drop-off, favoring flat, drained ground over low spots. If you are running a construction site through winter, ask about a monthly rental instead of booking week to week, since crews on longer jobs usually save by locking in the month rate. For events, a deluxe flushable unit handles cold-weather guests better than a standard model because the flush mechanism keeps odor down when doors stay shut longer in the cold. San Rafael does not see the kind of deep freeze that cracks tanks, but wind and rain both push people to want a unit with a working latch and a solid floor. That is one more reason we check ADA accessible units for stable footing every time, since ADA Standards 302.1 requires floor and ground surfaces that stay firm and slip resistant, and wet ground can undo that fast if the unit was not leveled right.
A self-contained portable sink with hot and cold water needs more attention once temperatures drop, mainly to keep the internal reservoir from getting sluggish rather than frozen solid. Our portable sink rental units carry their own heated water supply, so a hot and cold portable sink stays usable on a cold morning the way a hose bib outside would not. Under 29 CFR 1910.141(d)(2), washing facilities need soap and a way to dry hands, and hand sanitizer does not satisfy that rule by itself. That is why a handwashing station rental with real hot and cold water matters more in winter, when workers are less likely to rinse properly in cold water alone. If you are running a farm crew or field operation, OSHA 1928.110 sets one facility per 20 hand-labor employees within a quarter mile walk, and a portable sink hand wash station with hot and cold water meets that need without a plumbed building nearby. We service hand sanitizer stations too, but for anyone under a formal handwashing requirement, check handwashing requirements before you settle for sanitizer alone.
Some crews ask about a 20ft cold storage container for winter jobs, usually to protect materials or perishables from temperature swings rather than from freezing itself, since San Rafael winters rarely get cold enough to threaten stored goods the way a Midwest winter would. A standard 20ft storage container keeps contents dry and out of the rain, which does more good here than insulation. If your job needs a longer unit, the 40ft storage container gives more room for tools and materials between phases. Either way, check storage container rental cost before committing, since monthly storage runs lower than most people expect once you compare it against renting a unit day by day. Crews working sites near San Anselmo, 4.3 miles west of San Rafael, or Larkspur, 5.1 miles southwest, often split storage and toilets across two deliveries to save on the delivery fee, and that is worth asking about when you book both at once.
Winter pricing follows the same bands as the rest of the year, with duration driving the cost more than the season does. A standard unit runs from a day rate up through a full month, and locking in longer terms brings the daily cost down noticeably.
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $240-$400 | - |
| dumpster | $51-$112 | $426-$778 | $600-$900 |
A weekend rental for a standard unit runs $125 to $400, which works well for a one-off event rather than a multi-week job. Delivery fees add on top of the unit rate and range from $100 to $500 for a single day, so ask for that number up front. Compare options on porta potty rental cost or check the per day breakdown if you are only renting for a short stretch. Winter events near Mill Valley, 8.7 miles south, or Novato, 11.0 miles north, run the same rate structure, since pricing is not tied to zip code inside our service radius.
Yes. A 60 to 70 gallon tank holds enough volume that San Rafael's mild winter temperatures do not freeze it solid. Rain and wind cause more issues than cold, so proper placement on stable, drained ground matters more than any heating concern.
Not strictly, but a self-contained portable sink with hot and cold water makes handwashing far more likely to happen properly. Cold water alone discourages thorough washing, and 29 CFR 1910.141(d)(2) requires soap and drying access regardless of season.
The same OSHA 1926.51(c) ratios apply year-round: one toilet for 20 or fewer workers, scaling up from there. Season does not change the math. Use how many porta potties do I need to size it out for your crew count.
We have not seen local reports like this here, and it is not something San Rafael Porta Pros has any record of for this market. If you are asking about safety, well-maintained units with stable footing and working latches address the real risks better than rumor does.
Call or submit a request a quote with your dates, unit count and site address. We deliver within our regular radius and can typically confirm placement, count and pricing the same day you reach out.
Call now or request a free quote — clean units, on-time delivery, transparent pricing.
