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A practical planning figure for an office is about one quart (32 ounces, or 0.25 gallons) of drinking water per employee per in-office day, which works out to one 5-gallon bottle for every 20 employee-days. Adjust that baseline for coffee, heat, visitors and hybrid schedules, and you have a reliable number to order against.

Key Takeaways

• Plan on roughly 0.25 gallons per person per in-office day: a 5-gallon bottle covers about 20 employee-days and a 3-gallon glass bottle about 12.
• Count in-office days, not headcount. A 40-person team that comes in three days a week drinks like a 24-person team.
• Coffee and tea brewed with cooler water, summer heat and regular visitors can each push use 10 to 25 percent above the baseline.
• Keep one full spare bottle per dispenser so the office never runs dry between deliveries.
• Verde Springs delivers 5-gallon plastic and 3-gallon glass bottles to Chicagoland offices on a recurring schedule with no contract, so quantities can be adjusted as real usage becomes clear.

Where the one-quart-per-employee figure comes from

The U.S. National Academies of Sciences, Engineering and Medicine put adequate daily fluid intake at about 15.5 cups (3.7 liters) for men and 11.5 cups (2.7 liters) for women, with roughly 20 percent of that coming from food (Mayo Clinic summary). That leaves about 9 to 12 cups a day from drinks.

An eight-hour workday covers about a third of someone’s waking hours. A third of 9 to 12 cups is 3 to 4 cups, which rounds to one quart.

This is a planning number, not a hydration target. Some people will refill a 32-ounce bottle twice before lunch and others will barely touch the cooler. Across a team, those differences average out, which is why a per-person baseline works better for ordering than guessing.

One legal note for employers: federal OSHA’s sanitation standard requires potable drinking water in all places of employment (29 CFR 1910.141). Tap water can satisfy that. The calculator below is for offices that choose a cooler for taste, convenience or confidence in older building plumbing.

The per-employee office water calculator

To estimate monthly office water use, multiply people by in-office days by 0.25 gallons, then apply any adjustments that fit your office.

\text{Monthly gallons} = \text{employees} \times \text{in-office days per month} \times 0.25 \times \text{adjustment}

Divide the result by 5 for 5-gallon bottles or by 3 for 3-gallon glass bottles, and round up.

Adjustments worth adding

• Coffee and tea from the cooler: add about 10 to 15 percent if people brew with dispenser hot water or a cooler with a built-in brewer.
• Summer: add 10 to 20 percent from June through August, more for warehouse or shop space without air conditioning.
• Visitors: count each regular client or guest as about a quarter of an employee-day.
• Hybrid schedules: use average daily attendance, not headcount. Badge or desk-booking data is the best source.

Estimates by office size

This table assumes a five-day office (21.7 workdays a month), the 0.25-gallon baseline and no adjustments. Costs use Verde Springs bottle prices as of October 2026 and exclude the refundable bottle deposit and any dispenser.

Employees in office daily	Gallons per month	5-gallon bottles per month	5-gallon cost per month	3-gallon glass bottles per month	Glass cost per month
5	27	6	$60	10	$160
10	54	11	$109	19	$304
25	136	28	$279	46	$736
50	271	55	$547	91	$1,455
100	542	109	$1,085	181	$2,894

Worked example: a 40-person Chicago team in the office three days a week averages 24 people a day. In July, with a coffee habit and summer heat, that is 24 × 21.7 × 0.25 × 1.3, or about 169 gallons. That is 34 five-gallon bottles for the month, roughly eight a week.

What changes for small offices and large offices

The math scales evenly, but the practical problems do not. Small offices mostly worry about waste and storage. Large offices mostly worry about running out and how bottles move through the building.

Small offices and studios (under 15 people)

• One dispenser is enough. A single bottom-loading unit handles a 10-person office comfortably.
• Order for the low end, then adjust. At 5 to 10 people you may use one or two bottles a week, so an every-other-week delivery can be enough. Overordering leaves full bottles taking up floor space.
• Storage is the real constraint. A full 5-gallon bottle holds about 42 pounds of water. In a small suite, two or three spares tucked in a closet is the practical limit.
• Glass is more realistic here. At 5 people, 3-gallon glass runs about $160 a month versus $60 for 5-gallon plastic. That gap is easier to justify for a small team that cares about taste or plastic use than for a 100-person floor.

Larger offices (25 people and up)

• Plan one dispenser per break area, or roughly one per 25 people. Lines at a single cooler during the morning rush push people back to the tap or vending machines.
• Size the spare stock to the delivery gap. With weekly delivery, keep one spare per dispenser plus a few days’ supply. A 50-person office uses about 13 bottles a week.
• Sort out building logistics first. Loading dock hours, freight elevator access and who signs for deliveries matter more in a Loop high-rise than the bottle count does.
• Recheck the order every quarter. Attendance patterns shift, and an order set during a five-day-a-week period can be far too large once the team goes hybrid.

Glass or 5-gallon: what the per-gallon numbers mean

As of October 2026, Verde Springs 5-gallon plastic bottles cost $9.95, or about $1.99 per gallon, and 3-gallon glass bottles from Italy cost $15.99, or about $5.33 per gallon. For most offices, the 5-gallon bottle is the budget workhorse.

Glass earns its place in different situations: a client-facing reception area, a team that wants less plastic, or an office where lifting 42-pound bottles is a real concern. A 3-gallon bottle holds about 25 pounds of water, which is easier to load. Some offices split the order, with 5-gallon bottles in the break room and glass at the front desk.

Dispensers are the other line item. The Verde Springs Tahoe is a bottom-loading hot, cold and room-temperature dispenser that rents for $9.99 a month or sells for $229.99. For a shared kitchen, the Storm Café adds a built-in single-serve coffee brewer, at $24.99 a month to rent or $499.99 to buy. Verde Springs sets up the dispenser with every rental or purchase.

How Verde Springs handles office orders

Verde Springs delivers purified, mineral-balanced water to offices and homes across Chicagoland on a recurring schedule. Each office chooses its bottle type, frequency and drop location, and can change quantities, skip or pause deliveries online. There is no contract, so if the calculator’s estimate turns out high or low, the order changes with it. Empty bottles are collected at the next delivery.

The treatment process starts with carefully selected municipal sources, then runs through activated carbon, reverse osmosis, UV treatment and ozone disinfection before minerals are added back for taste. You can read how Verde Springs purifies its water for the full sequence.

Frequently asked questions

Start with the number, then let usage correct it

The one-quart baseline gets you close, and attendance data gets you closer. Run the formula, order slightly under your estimate with a spare bottle on hand, and adjust after the first month of deliveries. If you want a broader look at service options, the guide to office water delivery in Chicago covers dispensers, logistics and setup. When you are ready to compare your estimate with real pricing, Verde Springs products and pricing lists current bottle and dispenser options.