Zone 7 Water Trading Explained: Vic Murray (Below Choke)

Zone 7 is the Victorian Murray below the Barmah Choke. It covers the Murray River system downstream of the narrows at Barmah through to the South Australian border — Mildura, Sunraysia, Red Cliffs, Merbein, and the surrounding horticultural districts. This is where Australia's almond expansion has been most concentrated, and where the physical constraint of the Choke creates pricing dynamics unlike any other zone.

The delivery constraint that defines Zone 7

Every megalitre of water that reaches Zone 7 from upstream storage must pass through the Barmah Choke — a 70-kilometre stretch of the Murray between Tocumwal and Echuca where the river narrows through the Barmah-Millewa Forest. Channel capacity through the Choke is limited to approximately 8,000 ML per day.

During peak summer demand (November-February), the Choke can become a binding constraint. When upstream orders push flows to this ceiling, Zone 7 cannot receive additional water regardless of how much sits in Hume and Dartmouth. The river physically cannot deliver it.

This means Zone 7 is the only major Victorian trading zone that can face supply restrictions even when system storages are adequate. Water already held in Zone 7 accounts becomes more valuable because it can be delivered locally without the bottleneck.

The MDBA manages river operations to balance deliveries above and below the Choke, but the constraint is structural — it cannot be engineered away without flooding the Barmah-Millewa Forest.

Pricing: the downstream premium

When the Choke binds, Zone 7 prices detach from upstream zones. Ricardo data shows the premium consistently:

| Water Year | Zone 1A | Zone 6 | Zone 7 | |------------|---------|--------|--------| | WY2021/22 | $54/ML | $59/ML | $89/ML | | WY2022/23 | $21/ML | $18/ML | $33/ML | | WY2023/24 | $57/ML | $57/ML | $83/ML | | WY2024/25 | $124/ML | $112/ML | $174/ML |

Zone 7 trades at a $25-60/ML premium over upstream zones across all conditions. The premium widens in dry years when the Choke is more likely to bind and narrows in wet years when delivery is unconstrained.

In WY2024/25, Zone 7 averaged $174/ML versus Zone 1A at $124/ML — a $50/ML spread that reflects the delivery certainty of holding water below the bottleneck. For a 500 ML almond operation, that is $25,000 per year of additional water cost compared to an above-Choke equivalent.

Who trades here

Almonds have transformed Zone 7. The Murray corridor from Swan Hill through Mildura has seen enormous expansion over the past two decades. Almonds need 10-14 ML/ha and cannot be fallowed — a mature orchard that misses one season of water is dead. These growers create a demand floor: they buy at almost any price rather than lose trees worth $30,000-50,000/ha.

The estimated national almond water demand now exceeds 2,400 GL/year, and a substantial share of that sits in Zone 7. This structural demand is why Zone 7 prices have a higher floor than other zones.

Table grapes — Mildura and Robinvale are the centres of Australia's fresh table grape industry. Export-oriented, high-value, permanent plantings at 7-10 ML/ha.

Citrus — navels, mandarins, lemons. Permanent plantings at 8-12 ML/ha.

Wine grapes — the lower Murray Darling wine region. Bulk production, 5-9 ML/ha. Some growers struggling with low returns are removing vineyards, which releases water back to the market.

Dairy — still present in the Zone 7 corridor. Consistent demand through summer months.

The common thread: permanent plantings dominate Zone 7 more than any other Victorian zone. These growers cannot adjust demand downward when prices rise. They are structurally price-inelastic buyers.

Supply sources for Zone 7

Zone 7 receives water from multiple pathways:

1. Murray system releases (Hume and Dartmouth) flowing through the Choke — subject to the 8,000 ML/day capacity limit
2. Goulburn-to-Murray IVT — Zone 1A water entering the Murray system, which then flows through the Choke (subject to both IVT limits and Choke capacity)
3. NSW interstate trade — NSW Murray water tagged into the Victorian system (subject to 200 GL annual cap)
4. Within-zone trades — water already in Zone 7 accounts changing hands (no physical delivery constraint)

When the Choke binds and IVT exhausts simultaneously, pathways 1 and 2 are restricted. This is when Zone 7 prices spike hardest — supply can only come from within-zone trades or whatever physical flow the Choke permits.

Victorian water shares and allocation

Same Victorian framework as Zone 6 and Zone 1A:

HRWS — high-reliability water shares. First priority for allocation. Reached 100% by November 17 in WY2025/26 (Murray system). The premium entitlement for permanent crop operations that cannot risk a zero-allocation year.

LRWS — low-reliability water shares. Second priority. Zero allocation in WY2025/26. Cheap to buy but unreliable. Better suited to flexible operations.

Zone 7 allocations follow the Murray system determination — same as Zone 6. NVRM announces fortnightly. Because the Murray system has a larger storage buffer (Hume + Dartmouth = 6,900 GL combined), Murray HRWS typically reaches full allocation earlier than Goulburn HRWS.

Carryover strategy for Zone 7

Victorian carryover rules apply: up to 100% of water share volume. Spillable water mechanism applies. LROS declaration required by approximately 1 June.

For Zone 7 irrigators, carryover is not just an arbitrage tool — it is insurance against Choke-constrained delivery. If you carry water into the season, it is already in your Zone 7 account on 1 July. You do not need to worry about whether the Choke can deliver new upstream water during peak January demand.

This is why Zone 7 carryover tends to be held by permanent crop growers rather than speculators. The certainty value of having water below the Choke before the season starts is worth more than the raw megalitre price suggests.

In the current environment (Hume at 27%, Dartmouth at 65%), spill risk is negligible. Carry with confidence and reduce your mid-season buying pressure.

How to trade

Register with the Victorian Water Register. Contact a broker with your volume and timing requirements.

We source water from the Zone 7 market or arrange transfers from Zone 6 and interstate (subject to Choke capacity and IVT availability). Within-zone allocation transfers settle in 2-5 business days. Interstate transfers: 10-15 business days.

For entitlement purchases, the process takes 4-8 weeks. Zone 7 HRWS commands a premium over equivalent Zone 1A HRWS because of the delivery certainty below the Choke.

Check our water pricing guide for live Zone 7 levels.

Indicative only. Not financial advice. Water trade involves risk of principal loss.

Frequently asked questions

Why is Zone 7 water more expensive than upstream zones?

Physical scarcity. All water reaching Zone 7 must pass through the Barmah Choke (8,000 ML/day limit). When the Choke binds, Zone 7 is isolated from upstream supply. Combined with inelastic almond and citrus demand, this pushes prices $25-60/ML above Zone 1A and Zone 6 in most years.

How long do trade approvals take?

Within-zone allocation: 2-5 business days. Interstate transfers: 10-15 business days. Entitlement transfers: 4-8 weeks. Your broker tracks progress.

Can I transfer water from Zone 1A into Zone 7?

Technically yes, but it passes through two constraints: first the Goulburn-to-Murray IVT limit, then the Barmah Choke. If either constraint binds, delivery may be delayed or deferred. In practice, many Zone 7 buyers prefer to source within-zone or from Zone 6 (above Choke) to avoid the double constraint.

How does the Choke affect me day-to-day?

If you hold water in your Zone 7 account, the Choke does not affect you — your water is already below the bottleneck. The Choke matters when you are trying to bring new water into Zone 7 from upstream during peak demand. Plan your buying early in the season before the Choke becomes constrained.

What is the WY2026/27 outlook?

With Hume at 27% and IOD positive, the Murray system is entering next season with limited buffer. If El Nino develops, Zone 7 prices could run $300-500/ML given the structural almond demand floor and potential Choke constraints. Pre-season carryover and early buying are the primary risk management tools.