Office Emergency Water Reserves: Headcounts, Shifts and Rotation

An office emergency water reserve needs a named owner and a clear headcount. A few spare bottles beside the water cooler can disappear into ordinary use, while a stock calculation based on average attendance can miss a busy day with visitors.

This guide is for office managers planning drinking water before an earthquake, storm or building-service interruption. It builds on our general emergency water guide with a practical way to count people, separate reserve stock and check access across shifts.

Define what the reserve must cover

Write a short planning statement before ordering. For example: “This reserve covers everyone who could remain in the office, including visitors, for three days while we follow our emergency plan.”

A three-day or 72-hour reserve is a minimum starting point. PreparedBC's guide for tourism operators recommends at least four litres per person per day, with supplies for a minimum of three days and preferably a week to two weeks. Although written for that sector, it offers a useful reference for workplace planning. Your site's emergency plan determines the appropriate reserve; this article does not establish regulatory compliance.

Do not assume three days of stored water means the business should stay open. Follow evacuation directions and the building's emergency procedures. A reserve supports the plan; it does not decide whether remaining on site is safe.

Count employees, visitors and overlapping shifts

Start with the highest credible occupancy for the scenario, not payroll headcount or the quietest work-from-home day. List:

• Staff expected on the busiest day.
• Contractors, cleaners and security personnel who may be present.
• Visitors, clients or trainees.
• Overlap between incoming and outgoing shifts.
• Anyone who may need additional water or assistance accessing it.

Avoid counting the same person twice simply because they work across a shift boundary. Equally, do not assume outgoing staff can leave immediately if transport is disrupted.

For a mixed schedule, show the expected people for each day and add the totals. If the plan assumes everyone present might remain through the disruption, use that full headcount for each day. Make the assumption explicit so the next manager can understand the order.

Convert the plan into sealed 5-gallon bottles

Use people × days × 4 litres, then add extra needs. Divide the total by the labelled bottle volume and round up. A 5-gallon bottle contains approximately 18.9 litres; confirm the label on your order.

Suppose an office plans for 12 staff and three visitors, or 15 people:

• Three days: 15 × 3 × 4 = 180 litres. 180 ÷ 18.9 = 9.52, rounded up to 10 bottles (about 189 litres).
• Seven days: 15 × 7 × 4 = 420 litres. 420 ÷ 18.9 = 22.23, rounded up to 23 bottles (about 434.7 litres).
• Fourteen days: 15 × 14 × 4 = 840 litres. 840 ÷ 18.9 = 44.45, rounded up to 45 bottles (about 850.5 litres).

These are base quantities, before additional needs. Four litres includes drinking, food preparation and basic hygiene; it does not budget for normal toilet flushing, showers, commercial food operations or production processes. Those require separate planning.

For varying attendance of 15, 10 and eight people over three days, the base total would be (15 + 10 + 8) × 4 = 132 litres, or seven bottles. That smaller order is appropriate only if the attendance assumptions remain valid in your emergency scenario. Use the water supply planner to compare fixed-headcount options.

Give reserve stock its own inventory

A simple register prevents “spare water” from becoming invisible working stock. Record bottle count, labelled litres, location, purchase date, best-before date and the person responsible for replacement.

Keep bottles designated for the emergency reserve sealed. Do not count a partly used bottle on the dispenser as a full reserve bottle. When you rotate suitable stock into daily use, arrange replacement so the planned reserve is restored.

A useful management rule is to check the register whenever ordinary water arrives and whenever staffing changes substantially. Set the actual replacement deadline from product dates and supplier instructions. Health Canada's bottled-water FAQ suggests replacing emergency stored bottled water after one year; an earlier product date or supplier instruction takes priority. Ask Taj Water for the dates on the actual order. This is not a promise that every product will last a year.

Store water where each shift can reach it

Choose clean, cool, dry storage away from direct sunlight and chemical products. Fraser Health's preparedness guidance also says to protect stored water from excessive heat and freezing and observe bottled-water dates.

Before assigning a location, walk the route with the people who will use it:

• Can after-hours staff reach it without the office manager's key?
• Is the reserve on the same accessible floor as the people it serves?
• Can someone move and dispense a bottle without unsafe lifting?
• Are shelves or supports suitable for the load?
• Are clean cups, suitable dispensing equipment and instructions nearby?
• Does the arrangement keep exit routes clear?

An 18.9-litre bottle holds about 18.9 kilograms of water, plus its container. Forty-five bottles hold about 850.5 kilograms of water. Larger reserves need a considered storage arrangement; seek qualified advice about load-bearing capacity rather than concentrating them on an unverified shelf.

Plan dispensing and hygiene without normal utilities

Check how your particular water cooler works when power is off. A bottleless unit relies on the connected water supply, so it is not a separate stored reserve. Keep a compatible non-electric dispensing option and enough smaller sealed bottles for people who cannot handle large ones.

Follow equipment cleaning instructions and Health Canada's advice to refrigerate opened bottled water. Do not treat a manual pump as permission to leave an opened large bottle at room temperature for days. Smaller sealed portions can make the plan more practical where cooling is unavailable.

If water service is disrupted, follow current instructions from your municipality and health authority. Health Canada's emergency drinking-water guidance explains the need to follow local directions and use safe water for food, drinks and personal hygiene. Stored drinking water alone does not solve every sanitation need in an occupied workplace.

Order the emergency product deliberately

The dedicated Emergency Water product is $25 per 5-gallon bottle, no deposit, with the bottle yours to keep. Confirm delivery charges, current terms and product dates before ordering. Treat this as a separate purchase from ordinary exchange-bottle service.

For Vancouver and Lower Mainland workplaces, contact Taj Water ahead of time with your quantity, delivery address, access details and preferred date. Availability must be confirmed. Roads, supply and routes may be affected during an emergency, so a future delivery cannot replace water already on site.

For routine water station arrangements, see our office setup checklist. For staff planning reserves at home, share the condo storage and access guide.

A ten-minute office review

Ask one person from each shift to locate the reserve, read the inventory and explain how they would access water without the normal dispenser. Check the count against the written scenario, identify any missing access or cleaning supplies, and assign a person and date to resolve each gap.

The most useful outcome is a reserve the whole team understands: enough labelled litres for the chosen scenario, stored appropriately, reachable when needed and replaced before product dates.

Official guidance checked November 14, 2026. This article describes advance planning and does not announce a current emergency or water advisory.