Water Stress and Australia’s Water Landscape

Australia’s Water Challenges

Australia faces multiple water pressures:

• Aridity: Two-thirds of Australia receives <500mm rainfall annually; climate change is reducing rainfall in key regions (southern and eastern Australia)
• Volatility: Rainfall is highly variable year-to-year; droughts (2017–2019, 2022–2023) stressed supply, agriculture and energy sectors
• Competition: Water is shared among agriculture (~70% of water use), manufacturing, urban supply and environmental flows (rivers, wetlands)
• Overallocation: Many regions are overallocated; water licences exceed sustainable availability (particularly Murray-Darling Basin)

The Murray-Darling Basin (MDB)

The MDB is Australia’s most economically important water system, supporting ~40% of agricultural output. However, the Basin is severely stressed: the Murray-Darling Basin Plan (2012) caps water take; irrigation is increasingly constrained; environmental flows are inadequate. Organisations in MDB regions (NSW, Victoria, South Australia) face direct supply risk and regulatory pressure.

For organisations in MDB regions, water management is a critical business risk: ensure you have secure, legally compliant water access; plan for supply constraints; engage in water markets (e.g., purchasing entitlements if reliant on irrigation).

Water Risk Assessment and Materiality

Is Water Material to Your Business?

Assess water materiality through:

• Direct water dependency: Agricultural, mining, energy, manufacturing, food and beverage sectors are water-intensive. Service sectors (finance, consulting) have lower direct water use but may have supply chain dependencies
• Geographic water stress: Use WRI Aqueduct tool (wri.org/aqueduct) to assess water stress in your operating regions. High/extremely high stress = material risk
• Supply chain exposure: If suppliers are water-stressed (particularly agricultural or manufacturing), supply chain risk is material
• Regulatory exposure: MDB Plan, state water licensing, water quality regulations
• Financial impact: Model cost of water price increases (historical trend: 5–10% annually in some regions); supply disruption scenarios

For most organisations in water-stressed regions (much of Australia), water is material to ESG strategy and investor risk disclosure.

Water Accounting and Metrics

Water Withdrawals vs. Consumption

Water withdrawn: Total water extracted from source (rivers, groundwater, recycled).

Water consumed: Water that is not returned to source (evaporation, incorporated into products). Consumption is more relevant for environmental impact; withdrawal is more relevant for supply risk.

Report both metrics to stakeholders and investors.

Standard Metrics

• Absolute: Total water withdrawn/consumed (megalitres or GL per year)
• Intensity: Water per unit production, per employee, per revenue (e.g., litres/kg of product)
• By source: Mains water, recycled water, rainwater, groundwater (varies in stress and sustainability)
• By use: Cooling, processing, cleaning, irrigation (identify where savings are possible)
• Recycling rate: % of water recycled/reused (0–100%; higher is more sustainable)

Water Accounting Standards

Report water per GHG Protocol Water Stewardship Council or AASB S1/S2 guidance (if applicable to your organisation). CDP Water Security Survey is also widely used by investors for comparison.

Water Risk Scenario Analysis

Stress-Testing Water Supply

Model scenarios reflecting Australian water stress:

• Base case: Current water entitlements and prices; continue operations as-is
• Drought stress: Water availability -20% to -50%; model supply constraints, alternative sources, operational adjustments
• Regulatory constraint: Water entitlements reduced 10–30% (MDB Plan ratcheting, environmental flow increases); require new source or efficiency
• Price stress: Water costs increase 3–5% annually (recent trend); calculate cost impact over 10 years; identify cost mitigation

For water-dependent organisations, stress-testing is essential for risk management and investor confidence. AASB S2 implicitly requires climate scenario analysis including water impacts.

Water Efficiency and Management Strategy

Quick-Win Measures

• Leakage detection: Find and repair leaks in water infrastructure; typical savings 5–10% of water use with minimal capex
• Equipment efficiency: Replace old cooling systems, fix leaking taps; savings 10–20% with low cost
• Monitoring and metering: Install sub-metering to identify waste; data-driven efficiency often yields 10–15% reduction
• Recycled water: Use recycled water for irrigation, cooling, toilet flushing where permitted; local water authority guides available

Longer-Term Efficiency Investments

• Recirculating cooling systems: For energy-intensive facilities; capex of AUD $200K–$1M but 30–50% water savings
• Rainwater harvesting: Collect roof rainwater for toilets, cooling, irrigation; cost AUD $10K–$100K depending on scale; suitable where rainfall is adequate
• Wastewater treatment and reuse: Treat facility wastewater for reuse; AUD $100K–$500K capex but enables zero discharge; suitable for water-stressed regions
• Agricultural efficiency: Drip irrigation vs. sprinklers; crop selection; soil moisture monitoring; 20–40% water savings typical

Governance and Targets

Set water reduction targets (e.g., “reduce water intensity 30% by 2030”) aligned to science (water stress context, supply constraints) and business strategy. Board oversight of water risk and progress builds credibility with investors and demonstrates seriousness.

Supply Chain Water Management

For organisations with water-dependent supply chains (agriculture, food and beverage, textiles, mining), water risk is systemic:

• Supplier mapping: Identify suppliers in water-stressed regions (WRI Aqueduct, World Bank tools)
• Supplier engagement: Request water data; encourage efficiency and resilience investments
• Diversification: Reduce reliance on single water-stressed regions by diversifying sourcing
• Investment: Partner with suppliers to build water infrastructure (e.g., invest in irrigation efficiency for agricultural suppliers)

Water risk in supply chains is increasingly material to investor and customer expectations; visible management signals resilience.

Frequently Asked Questions