Indirect Water Footprint

The indirect water footprint (also called the Scope 3 water footprint) represents the total volume of water associated with the goods and services an organisation or individual acquires that is consumed or polluted outside their direct operations. It includes the virtual water used in raw-material extraction, energy generation, component manufacturing and intermediate transport. In many manufacturing companies it is the dominant part of the total water footprint, frequently larger than direct operational use.

Breakdown of the indirect footprint

• Agricultural raw materials: blue and green water for cotton, maize, coffee and similar crops.
• Mineral raw materials: blue and grey water associated with mining lithium, copper or bauxite.
• Purchased energy: water for cooling in thermal power plants or for producing biofuels.
• Components and semi-manufactured goods: steel, plastics and chemicals.
• External services: data centres, logistics and industrial cleaning.

Step-by-step calculation methodology

1. Supply-chain mapping: identify priority inputs based on expenditure or water risk, combining spend analysis with AWARE.
2. Assign water-footprint factors: use sources such as the WaterStat database, ecoinvent, FAO AQUASTAT or primary supplier data.
3. Volumetric calculation: multiply factors (cubic metres per unit) by the quantities purchased.
4. Source classification: separate blue, green and grey water.
5. Impact weighting: apply AWARE or the Water Stress Index to prioritise critical basins.
6. Verification: triangulate with water bills and external auditors.

Key indicators

• Absolute indirect water footprint (cubic metres per year).
• Indirect water footprint per product unit (cubic metres per unit).
• Indirect share (%) = indirect footprint divided by total footprint.
• Water intensity per unit of monetary value (cubic metres per euro purchased).
• Share of the footprint located in high-stress basins.

How to read the results

Once the indirect footprint is quantified, the priority is to find the few inputs and basins that concentrate most of the impact. In typical consumer-goods and textile value chains, agricultural raw materials and purchased energy tend to dominate, which is why supplier engagement upstream usually delivers the largest reductions. Express results both in absolute terms and weighted by local water scarcity, so that a cubic metre used in a water-stressed basin is not treated the same as one used where water is abundant.

Reduction strategies

• Reformulate products using lower-footprint materials (for example, more water-efficient cotton or recycled polymers).
• Contract renewable energy through power purchase agreements for suppliers with high electricity consumption.
• Run water-efficiency programmes at source, co-financing drip irrigation and treatment at farms.
• Diversify procurement toward basins with lower water stress.
• Add water clauses to supplier contracts, with annual reduction targets for Tier 1 and Tier 2 suppliers.
• Use in-situ water replenishment when substitution is not feasible.

Integration with ESG frameworks and regulation

• GRI 303: reports water use across the supply chain.
• CDP Water Disclosure: scores transparency and reduction of the indirect footprint.
• CSRD and ESRS E3: require disclosure of upstream and downstream water impacts.
• ESPR Regulation: digital product passports can include virtual-water data.

Connection with other indicators

• Water Dependency Index: the share of the total footprint met externally.
• Footprint Displacement Index: aggregates externalised environmental footprints.
• Corporate water neutrality: replenishment should cover part of the indirect footprint, weighted by scarcity.

Barriers and limitations

• Incomplete traceability beyond Tier-2 suppliers.
• Heterogeneous regional datasets and conversion factors.
• Commercial confidentiality limiting access to primary data.

The indirect water footprint is the critical link for understanding an organisation's real water impact and building resilient, water-neutral supply chains. Reducing it requires close supplier collaboration, material and energy innovation, and continuous monitoring. At Manglai we help companies measure their environmental footprint and prepare their sustainability reporting. Discover how Manglai can help you.