Water Scarcity Footprint (AWARE)

The Water Scarcity Footprint (WSF) based on AWARE (Available WAter REmaining) is a Life Cycle Impact Assessment (LCIA) indicator that weights freshwater consumption by the local water scarcity of the river basin where the use occurs. Consuming one cubic metre of water in a water-stressed basin has a far greater impact than consuming the same volume where water is abundant, and the WSF captures exactly that difference.

The AWARE method was developed by the WULCA working group of the UNEP Life Cycle Initiative as a consensus model, and it is the approach recommended for water scarcity in the European Commission's Environmental Footprint method and for comparative water footprint studies under ISO 14046.

Concept and formula

WSF (m3 eq) = Water consumption (m3) x basin-specific AWARE factor

The AWARE characterisation factor is dimensionless and expresses how much water remains available in a basin (after human and ecosystem demand) relative to the world average. Factors range from 0.1 to 100:

• A factor of 1 corresponds to a basin with water availability equal to the world average.
• A factor of 10 means roughly ten times less water available per area than the world average (higher scarcity).
• Values approach the cap of 100 in the most water-scarce situations, while values below 1 indicate relative water abundance.

Advantages compared with other indicators

• Global coverage with monthly and sub-watershed (basin) resolution.
• Integrates environmental flow requirements and human demand, avoiding the over-penalisation of high-rainfall regions.
• Fully compatible with Life Cycle Assessment and ISO 14046 for product and corporate studies.

How to calculate the AWARE-based WSF

1. Geolocate each point of water consumption along the supply chain.
2. Assign the AWARE factor for the corresponding basin using the official WULCA database.
3. Multiply each consumed water volume (m3) by its AWARE factor.
4. Aggregate the results to obtain the total WSF (m3 eq).
5. Interpret: higher values indicate a greater contribution to global water stress.

Interpreting AWARE factors

As a rough guide, low factors (around or below 1) reflect water-abundant basins, while progressively higher factors reflect increasing scarcity, up to the cap of 100. The exact factor for any location should always be taken from the official WULCA dataset rather than assumed, because scarcity varies strongly by basin and by month.

Corporate and policy applications

• Prioritise water replenishment projects in the most water-stressed basins as part of corporate water neutrality strategies.
• Eco-design, by substituting ingredients or materials that carry a high water scarcity footprint.
• CDP water security reporting, where scarcity-weighted water use supports more meaningful disclosure.

Integration with other metrics

• Feeds the water-use (deprivation potential) category in impact assessment methods such as ReCiPe 2016.
• Aligns with the Water Footprint Assessment, adding a scarcity dimension to volumetric accounting.
• Complements the Water Dependency Index by revealing the relative impact of imported virtual water.

Challenges and best practices

• Spatial granularity: using the exact coordinates of farms and facilities is far more accurate than country-level averages.
• Temporal representativeness: AWARE factors are based on historical climatology, so sensitivity analysis against future climate scenarios is advisable for long-lived decisions.
• Consumption vs withdrawal: AWARE accounts for net water consumption, not gross withdrawals; balances should be adjusted where water is returned to the same basin.
• Supply-chain data: water reporting clauses and third-party checks help obtain reliable data from deeper-tier suppliers.

Available tools

• The official WULCA AWARE factors and calculator.
• GIS tools (QGIS, ArcGIS) to intersect AWARE basin data with process locations.
• LCA software such as SimaPro and openLCA, which include AWARE within the Environmental Footprint method.

The AWARE-based Water Scarcity Footprint brings local water stress into water footprinting, supporting better decisions in design, sourcing and replenishment where impacts truly matter, and contributing to Sustainable Development Goals 6 and 12. At Manglai we help companies measure their water and carbon footprints and prepare their sustainability reporting. Discover how Manglai can help you.