Production water cost.

Water footprint measures total water used per unit of production. Cost = production litres × units × water price per 1,000 litres. Industries vary enormously: textile (10,000 litres per kg), food processing (1,000-5,000 litres per kg), electronics (30-50 litres per unit), paper (10-20 litres per sheet). Understanding water cost per unit reveals opportunity for process optimization.

500 litres per unit × 100,000 annual units = 50,000,000 litres. At 3 per 1,000 litres = 150,000 annual water cost. 1.50 per unit water cost. If product sells for 50, water is 3% of revenue - modest but visible. For water-intensive products (beverages, textiles), water can be 5-15% of production cost.

Water footprint reduction: closed-loop cooling systems (recirculate water, 50-80% reduction), dry processing alternatives where possible (air cooling vs water cooling), cascading use (use clean process water for less-critical cleaning), and treatment/reuse (treat wastewater to re-enter production). Each can reduce water cost per unit 20-50%.

Run it with sensible defaults

Using litres per unit of 500, annual units of 100,000, cost per 1000 litres of 3, the calculation works out to 150,000.00. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Litres per Unit, Annual Units, and Cost per 1000 Litres — do not pull with equal force. Frequency and unit price pull the total in different directions. The biggest surprise for most people is how small recurring amounts compound into large annual figures — that's where this calculation earns its keep.

How the math works

Total litres = per unit × units. Cost = (total litres ÷ 1000) × price per 1000L. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".

Running the sensitivity

Energy prices, usage patterns, and grant availability all move the payback figure. Test at least two scenarios — current rates and a rate 20% higher — to see whether the decision holds up across plausible futures.

What this doesn't capture

Carbon reduction, health benefits, and local air quality have real value the financial figure doesn't price. The calculation gives the money side honestly; for the full picture, note the non-financial benefits alongside.