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Understanding Water Trading Prices in the Murray-Darling Basin
Water prices in the southern MDB have ranged from $36/ML to $485/ML in the last six years. That's not random — it's a predictable function of supply, demand, and market structure. Here's how to read the market.
Supply: The Dominant Driver
The single biggest factor in water prices is how much water is available. The supply chain runs: catchment rainfall → dam inflows → storage levels → HRWS determination → spot price.
In Victoria, the Northern Victorian Resource Manager (NVRM) announces the High Reliability Water Share (HRWS) determination for the Goulburn system. This number — the percentage of your entitlement you actually receive — is the market's primary signal:
- 100% HRWS (most years): prices typically $60–150/ML
- 60–80% HRWS (dry years): prices $150–350/ML. This season's 80% final determination, combined with low starting storage, has Zone 1A at $258/ML.
- Below 50% HRWS (drought): prices $350–500+/ML. The Millennium Drought saw determinations below 50% and prices reportedly reaching $500–900/ML.
Weather forecasts are the leading indicator. A forecast for El Niño (drier) pushes prices up on anticipation; La Niña (wetter) does the opposite. The BoM ENSO outlook and IOD tracker are essential tools. For more on the climate signals, see our article on drought and climate impacts.
Demand: The Almond Floor
The demand side of the market has fundamentally changed over the past decade. The expansion of permanent plantings across the MDB — particularly almonds (~100,000 ha), citrus, and table grapes — has created a demand floor that didn't exist before 2015.
These crops need water every year (almonds: 10–14 ML/ha, stone fruit/citrus: 6–8 ML/ha). Growers will pay well above their break-even point to keep trees alive, because the alternative — letting a multi-year, multi-million dollar investment die — is worse. Almond break-even on water is estimated at $600–900/ML.
This is why the price floor has risen structurally:
- 2000–2010: trough ~$30–50/ML
- 2010–2020: trough ~$50–80/ML
- 2020–2026: trough ~$80–120/ML
Annual crops like cotton ($100–150/ML break-even) and rice ($80–100/ML) flex with price — their growers buy when water is cheap and fallow when it's expensive. Dairy ($100–200/ML) often substitutes purchased feed for water when allocation prices are high.
Zone Prices: The Basis Spread
Different zones trade at different prices, and the spread between them tells you about physical constraints in the system.
Current prices (WY2025/26 YTD to March 2026):
- Zone 1A (Goulburn): $258/ML
- Zone 6 (Murray above Choke): $267/ML
- Zone 7 (Murray below Choke): premium to Zone 6
- NSW Murray (above Barmah): ~$115/ML (WY2024/25 data)
- NSW Murrumbidgee: ~$177/ML (WY2024/25 data)
- SA Murray: ~$186/ML (WY2024/25 data)
Zone 1A normally trades at a premium to Zone 6 because the Goulburn system offers better delivery timing and reliability. The current season is unusual — Zone 6 is at $267/ML vs Zone 1A at $258/ML. This can happen when Murray-specific demand or interstate trade dynamics create localised tightness.
The Barmah Choke creates the most important basis spread in the market. This narrow section of the Murray physically limits downstream delivery. When trade limits are reached, water below the Choke can trade at a significant premium to water above it.
Seasonal Price Cycle
Within each water year, prices follow a typical pattern:
- June–July: low point. New season, opening determinations announced, uncertainty about the year ahead.
- August–October: prices rise as NVRM upgrades determinations and the season's water availability becomes clearer.
- January–February: seasonal peak. Peak irrigation demand (summer), and the market has priced in the available supply.
- March–April: prices ease as irrigation season winds down and remaining allocation is sold or carried over.
Key Data Sources
Stay informed with these resources:
- Victorian Water Register Dashboard — official Victorian trade data, volumes, and prices
- BoM Water Markets Dashboard — national trade data and annual reports
- MDBA — river operations, storage levels, and trade constraint updates
- Ricardo (formerly Aither) — independent annual water markets reports with detailed multi-zone analysis and the Ricardo Entitlement Index (REI)
When reading price data, always look at the Volume Weighted Average Price (VWAP) rather than simple averages. VWAP gives more weight to larger trades, providing a more accurate picture of where the market is really transacting.
For the fundamentals behind these numbers, see our beginner's guide to water trading and entitlements vs. allocations.