What Is Water Consumption per Unit?
Water Consumption per Unit measures the total volume of water required to produce one unit of output. It covers process water (cooling, washing, mixing), utility water (steam generation, HVAC), and any water that becomes part of the product.
The Formula
Water per Unit = Total Water Volume (litres) ÷ Units ProducedCan be measured in litres, gallons, or cubic metres depending on convention.
Data Requirements
| Source | Required | What You Need |
|---|---|---|
| Machine Data | Yes | Production count |
| Flow Meters | Yes | Water consumption by line or process |
| Utility Data | Yes | Facility water consumption readings |
Water per Unit is a Phase 4 metric — it requires water flow monitoring infrastructure.
Why It Matters
- Sustainability — water scarcity is a growing global concern; responsible use matters
- Cost — water supply and wastewater treatment costs are rising
- Regulatory compliance — water use permits, discharge regulations, and reporting requirements
- Operational efficiency — high water consumption often indicates leaks, waste, or inefficient processes
Best Practices
- Install flow meters at process level for accurate tracking — facility meters alone are insufficient
- Identify and fix leaks promptly
- Implement water recirculation and reuse where quality permits
- Track water consumption by process to find reduction opportunities
- Set reduction targets and report progress alongside energy and carbon metrics
Related Metrics
- Energy Consumption per Unit — energy and water efficiency often improve together
- Carbon Footprint per Unit — water treatment and heating contribute to carbon emissions
- Cost per Unit — water is a component of operating cost