How much drinking water a California crew needs, and how many water stations to order
Most water problems on a job start with a guess. Someone orders one trailer because the last job had one, and by two in the afternoon the tank is low and a foreman is off buying cases of bottled water. Start with the math, then add what the math misses.
The state floor is simple. Section 3395 asks for enough water that every worker can drink at least one quart an hour for the whole shift. A quart is a quarter of a gallon. A crew of 40 on a ten-hour day needs at least 100 gallons, before anyone fills a bottle for the drive home. A crew of 150 on the same shift needs at least 375 gallons.
That number is a minimum, not a plan. People drink more in August than in April. A crew doing heavy work in direct sun drinks more than a crew finishing drywall inside a shaded building. On hot jobs we plan well above the floor, so a slow truck or an extra shift does not drop you under it.
Then look at how many people hit the water at once. A break for 60 people means 60 bottles in a few minutes. Our Signature Series trailer has four bottle-fill stations, so four people fill at the same time. If a big crew breaks together, one trailer still works, but the line gets long and people give up. Staggered breaks help. A second trailer helps more.
Distance is the next question. The standard says as close as practicable to where people work. On a compact site that is one spot. On a warehouse pad, a solar field or a long road job, it is not. If a worker has to walk several minutes each way, they will skip the drink. We look at the site plan, place trailers so the walk stays short, and move them as the work moves.
Now set the fill schedule. Tank size, crew size and heat decide how often the truck comes. A small crew in mild weather might need a fill every few days. A big crew in the Central Valley in July can need a daily visit, sometimes two. We time fills before the hottest hours so the tank is full when demand peaks, and every visit goes in the service log.
Say you have 120 people on a tilt-up job in Riverside in July, working 6 a.m. to 4:30 p.m. That is ten and a half hours, so the floor is 1,260 quarts, or 315 gallons. Most of that crew breaks at the same two times. We would plan two trailers at opposite ends of the pad, fill both before noon, and add a late-day visit during heat waves.
A few things change the count. Night shifts drink less, but not zero. Remote sites far from our fill source need more buffer in the tank. Smoke days can move work or change break times. A crew that grows mid-job needs a fresh count, not last month's number.
Send us your head count, shift length, site address and start date. We will do the math with you, show you the trailer count and the fill schedule, and put it in writing so it can go straight into your plan.
Sources: Cal/OSHA Title 8 Section 3395, heat illness prevention
Questions public buyers should ask before hiring a water station vendor in California
A county office, a school district and a federal agency all buy water in different ways. The questions that separate a good vendor from a risky one are the same. Ask them before the award, not after the first missed fill.
Start with registration. For any job with federal money, check that the vendor is registered and active in SAM.gov. It sounds basic. It also saves a contracting officer a week of back and forth when the purchase order is ready and the vendor is not. We are SAM.gov registered and send our details with the quote.
Ask who actually does the work. Some vendors broker a job to whoever has a truck nearby. That can work on a quiet week. During fire season it often means a missed fill. The subcontractor took a better-paying call instead. Ask whether the company delivers and services its own trailers with its own crew. Ours does.
Ask how they size the order. A vendor who names a trailer count before asking about head count, shift length and heat is guessing. The right questions come first: how many people, how many hours, how far the site sits from the fill source, and how hot it gets there in the worst week of the job. The answer should come back as a trailer count and a fill schedule, in writing.
Ask how the water is handled. Everything that touches the water should be food grade. The tank should be filled only from a potable source and sanitized between rentals. If you are buying during a boil-water notice, ask where the fill water comes from. It should come from outside the affected system. A vendor who has to think about that answer has not done this before.
Ask for a sample service log. This is the one most buyers forget. A written record of every fill and cleaning by date and time protects you when an inspector, an auditor or a parent asks what was done and when. If a vendor cannot show you one, that tells you how the job will go.
Ask about response time and after-hours coverage. Who answers at 2 a.m.? How long to get a second trailer if the crew doubles? What happens if a chiller fails on a Saturday in August? A good answer describes a process with names and phone numbers. A weak one is a promise.
Ask about insurance and what your site has to provide. You want a certificate of insurance on file before the first delivery. You also want the vendor to tell you, in writing, what the site needs: a level spot, a way in for the truck, and power or room for a generator. Surprises on delivery day slow everyone down.
Ask what happens when the job changes. Crews grow. Schedules slip, and a summer shutdown at a school can run well into September. A good contract lets you add a trailer, extend the dates or move a unit to a second site without starting the paperwork over. Find out how much notice they need for each of those.
Ask whether they can cover the rest of the site too. A camp or a long build usually needs restrooms, showers or laundry as well. We quote them together on one contract when that helps the buyer, and our long-term laundry trailer rentals nationwide for crew camps are the most common add-on to a water order.
Call us or request a quote with your bid documents attached, and we will answer each of these questions in writing.
Keeping drinking water on site during a PSPS power shutoff in California
When fire weather hits, California's big utilities can cut the power on purpose. PG&E, Southern California Edison and San Diego Gas and Electric all use Public Safety Power Shutoffs, or PSPS, to take lines offline during high wind so they do not start a fire. The shutoffs are tracked and reported through the California Public Utilities Commission. Southern California Edison filed post-event reports for shutoffs in both May and September of 2025.
A shutoff is more than a dark building. Water systems need power to pump. That is why the CPUC lists water and wastewater providers as critical infrastructure, right next to hospitals and fire stations. A shutoff that lasts several days can cut water pressure in the same area where it cuts the lights. A job site or facility on its own well can lose water completely.
Plan for it before the wind forecast. If your site sits in a high fire-risk area, find out how your utility will notify you, and put the water plan in writing now. A trailer with its own tank does not care if the local pump stops. The chiller is another story. It needs power, so on a PSPS-prone site we bring a generator with enough fuel for the expected outage.
Care facilities have their own chain of command. Skilled nursing and long-term care sites in California report outages, generator and fuel status, and resource needs to county public health and the Medical Health Operational Area Coordinator. That same chain can approve emergency contracts during a long outage. If you manage one of these facilities, it helps to have a water vendor already on file before the season starts.
Job sites face a different problem. The crew is still working. It is often hot and windy, and the site office water cooler stopped the moment the power did. A chilled trailer with its own generator keeps your heat plan intact through the outage, and the service log shows the water never stopped.
Timing is the hard part. Shutoffs come with the same dry wind events that raise fire risk, so demand for generators and trailers spikes at the same moment across the region. Book before the season, not during the warning. We can stage a unit ahead of a forecast event and hold it for you.
Generator placement takes some thought. It needs level ground, distance from dry brush and a clear path for a fuel truck. On a windy red-flag day, nobody wants a hot exhaust pipe next to tall grass. We set the generator where it is safe to refuel and where the noise does not sit right on top of a break area.
Long outages need a tank plan too. If the local system loses pressure, we fill from a source outside the outage area and keep coming on the same schedule, so the water stays full even when the taps in town do not.
Keep the checklist short. Know your utility's notice process. Know where crews or residents will get water if the local system loses pressure. Line up a trailer and a generator in advance, and keep the fuel plan in writing. Then call us when the forecast turns, and we will confirm the delivery window.
Sources: California Public Utilities Commission, Public Safety Power Shutoffs
Planning water for military field exercises and desert range work in California
California has about 44 military installations across six branches, more than any other state. Several of them are among the biggest training grounds in the country, and much of that training happens in the desert, a long way from a water main.
Fort Irwin's National Training Center near Barstow runs multi-week armored and mechanized rotations in the Mojave. Marine Corps Air Ground Combat Center Twentynine Palms is the largest Marine Corps installation in the world by land area. Camp Pendleton covers a long stretch of the North San Diego County coast. Edwards Air Force Base, Naval Air Weapons Station China Lake and the Mojave Air and Space Port turn the high desert into a flight-test corridor with its own field activity.
Field exercises often outgrow what the garrison has. When a large rotation stands up temporary support in the field, water has to go where the troops and contractors are, not where the pipes are. Base construction and renovation add a second kind of demand. Contractor crews can work inside a secure fence for months, and they need drinking water every day of it.
The Mojave is hard on equipment and people. It gets less than six inches of rain a year and sits between 3,000 and 6,000 feet. Summer days are brutal. Nights can turn cold. Long dirt-road hauls are normal. We run the trailer off its own tank, carry a generator for the chiller and plan fills around range schedules and gate hours.
Placement in the field follows the same idea as on a job site. Put the water where people gather, like the motor pool, the chow line or the staging lot. Night operations change the pattern. Crews often drink the most in the late afternoon before a night movement. We time fills so the tank is full before those peaks.
Winter rotations still need a plan. Desert nights in January can drop hard, and a unit left alone for a week is a unit nobody has checked. We look the trailer over at every visit and note it in the log.
Access is the other half of the job. Installations have their own steps for vendor badging, vehicle inspection and escorts, and they differ from base to base. Send us the contracting office's requirements early. We will get drivers and trucks cleared before the first delivery, so the water is not sitting at the gate while a crew waits.
Contracting runs through base contracting offices and federal systems. We are SAM.gov registered, licensed and insured, and we can quote to a statement of work. For a prime contractor on base construction, federal jobsite water rules still apply to your own crew, and a service log with every fill recorded makes that easy to show.
Exercises also change fast. A rotation can add people, move a staging area or run later than planned. Tell us who to call when the plan shifts, and we will move or add a trailer without a new round of paperwork where the contract allows it.
Send the location, the dates, the head count and any access rules, and we will build the water plan around the exercise schedule.
When heat and wildfire smoke hit the same California job site
Fire season and heat season now overlap across much of California. A crew in the Central Valley, the Los Angeles basin or the North State can be working under two outdoor rules on the same day, each with its own effect on water, shade and breaks.
The smoke rule is Title 8 Section 5141.1. It kicks in when the Air Quality Index for PM2.5 reaches 151 or higher and workers can be expected to be exposed. Once it applies, employers track PM2.5 through EPA AirNow, the local air district or their own monitor. They tell workers the current AQI and what protection is available. They also train workers on smoke hazards.
Controls come in a set order. First come engineering controls, like filtered, enclosed buildings or vehicles. Next come administrative controls, like moving the work, changing the schedule, cutting how hard people work, or adding rest breaks. Respirators come last. N95s are offered for voluntary use between AQI 151 and 500 and are required above 500. Workers exposed one hour or less a shift, and people already inside filtered buildings or vehicles, fall outside the rule.
This is where the two rules meet. More rest breaks and moved work are the same tools a heat plan uses. A crew sent to a filtered break room still needs water, and more breaks mean more people at the water at once. Respirators also make heavy work harder and hotter. Crews need more to drink on those days, not less.
Plan the water around the break plan. If smoke days mean a filtered break room or a cooled site trailer, put the water station right outside the door. If breaks get longer or more frequent, check the station count. The four bottle-fill stations on our trailer can only serve so many people in a few minutes.
Watch the fill schedule too. On a smoke day, roads near an active fire can close and trucks run slower. We keep an extra buffer in the tank during active fire weeks, so a late truck does not leave your crew short. If a road does close, we reroute and tell you the new window.
Moved work means moved water. If the plan shifts a crew to the far side of a site, or to a second site with cleaner air, the water has to follow. Call us the day before if you can, and we will move the mobile water station so it is waiting when the crew gets there. If smoke shuts the site down for a few days, tell us as well. We will adjust fills instead of topping off a tank nobody is using.
Supervisors should know where the water is, just like they know where the N95s are kept. It sounds obvious, but in a fast change of plans, the water is the thing that gets left behind.
Write it all down in one place. A heat plan and a smoke plan that point to the same water source, with the same service log behind them, are easier to follow on a bad day. They are also easier to show an inspector later.
If your crews work in fire country, call us before the season starts, and we will set the water plan for both.
Sources: Cal/OSHA Title 8 Section 5141.1, protection from wildfire smoke
