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 Murray storage must pass through the Barmah Choke — the narrow reach of the Murray between roughly Yarrawonga and Barmah where the river passes through the Barmah-Millewa Forest. Channel capacity through the Choke is limited to about 7,000 ML per day, and it is declining as sand accumulates in the channel.

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. The season VWAP history shows how the spread moves:

Water Year	Zone 1A	Zone 6	Zone 7
WY2021/22	$54/ML	$59/ML	$89/ML
WY2022/23	$36/ML	$37/ML	$33/ML
WY2023/24	$68/ML	$57/ML	$83/ML
WY2024/25	$104/ML	$113/ML	$174/ML

In most seasons Zone 7 trades at a clear premium to upstream zones. The premium widens in dry years when the Choke is more likely to bind — $70/ML over Zone 1A in WY2024/25 — and disappears in record-wet years like WY2022/23 when delivery is unconstrained everywhere. Track live Zone 7 prices to see where the spread sits today.

In WY2024/25, Zone 7 averaged $174/ML versus Zone 1A at $104/ML — a $70/ML spread that reflects the delivery certainty of holding water below the bottleneck. For a 500 ML almond operation, that is $35,000 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.

Mature almond orchards across the Basin need roughly 700 GL/year — about a third of all high-security entitlement on issue — 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 roughly 7,000 ML/day capacity limit
2. Goulburn-to-Murray IVT — Zone 1A water entering the Murray at Echuca, downstream of the Choke. This trade never passes through the Choke; it is governed by the separate Goulburn-to-Murray trade limit and its announcement windows
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)

Note what is missing from this list: allocation trade from Zone 6. Trade from above the Choke into Zone 7 is restricted — effectively closed — because it would add delivery through the Choke.

When the Choke binds and the Goulburn IVT exhausts simultaneously, pathways 1 and 2 are both 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, rolled forward automatically at 30 June. The spillable water mechanism applies — carried water stays locked in your spillable account until the storage manager declares a Low Risk of Spill (LROS).

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 22%, 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. Our Zone 7 trading guide covers the rules in detail.

We source water from the Zone 7 market or arrange transfers from Zone 1A (subject to Goulburn-to-Murray IVT availability) and interstate. Allocation trade from Zone 6 down into Zone 7 is effectively closed. 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. Upstream Murray water reaching Zone 7 must pass through the Barmah Choke (about 7,000 ML/day and declining), and allocation trade from Zone 6 into Zone 7 is effectively closed. Combined with inelastic almond and citrus demand, this pushes Zone 7 prices above Zone 1A and Zone 6 in most years — the spread was $70/ML over Zone 1A in WY2024/25, and it widens in dry conditions.

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?

Yes — while the Goulburn-to-Murray IVT limit is open. The Goulburn joins the Murray at Echuca, downstream of the Choke, so Zone 1A water does not pass through the Choke; the trade is governed by the separate Goulburn IVT limit and its announcement windows (around 1 July, 15 October and 15 December). It is the reverse of what many assume: Zone 6, not Zone 1A, is the zone effectively cut off from Zone 7 buyers, because trade from above the Choke would add delivery through it.

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 for the river's physical ability to deliver upstream Murray water during peak demand, and it is why allocation trade from Zone 6 into Zone 7 is effectively closed. Plan your buying early in the season before delivery becomes constrained.

What is the WY2026/27 outlook?

With Hume at 22% and an El Nino likely emerging, the Murray system is entering next season with limited buffer. If El Nino confirms, Zone 7 prices could run $400-550/ML given the structural almond demand floor and potential Choke constraints. Pre-season carryover and early buying are the primary risk management tools.