A single timber shipment crossed the ANZ border last month with unmarked pallets. DAFF flagged it immediately. The cost: $8,600 in re-export logistics, $2,400 in treatment, $1,200 in port demurrage. Total hit to the forwarder's margin: $12,200 on a shipment that should have been processed in 48 hours.
This scenario repeats dozens of times per quarter across Australian and New Zealand ports. And it is entirely preventable.
International Standard for Phytosanitary Measures No. 15 (ISPM 15) is the global standard for treating wood packaging used in international trade. It exists for a single reason: to prevent the global spread of wood pests like the pine wood nematode, bark beetles, and longhorn beetles that devastate timber industries.
Australia and New Zealand enforce ISPM 15 with zero tolerance. A container arrives with even one non-compliant pallet, and the entire shipment is at risk of detention, treatment, or rejection. For timber importers and the freight forwarders handling their cargo, that means ISPM 15 is not optional compliance theater -- it is the gate between a clean clearance and a five-figure financial disaster.
What ISPM 15 requires
Every piece of wood packaging used in international shipments to Australia and New Zealand must meet one of three treatment standards:
1. Heat treatment (HT)
Wood is heated to a core temperature of 56 degrees C for at least 30 consecutive minutes. This kills wood-boring insects, bark beetles, and pathogens at all life stages. Heat-treated wood is marked with the IPPC logo, the country of treatment, and the unique treatment facility number (e.g., AU 001).
Heat treatment is the most common method globally. It is cheaper than fumigation, faster, and leaves no chemical residue. Most Australian and New Zealand timber imports arrive on heat-treated pallets.
2. Methyl bromide (MB) fumigation
Wood is fumigated in a gas-tight chamber with methyl bromide at a specified concentration for a set exposure period (typically 24-48 hours, depending on wood thickness). Fumigation reaches wood that is too thick or too large to heat-treat uniformly. Fumigated wood is also marked with the IPPC logo and treatment facility number.
Methyl bromide fumigation is regulated but still legal for ISPM 15 compliance. Some countries are phasing it out due to ozone depletion concerns, but it remains in use for specific applications -- particularly for thicker dimension timber.
3. Kiln drying or other approved methods
Wood that is kiln-dried to specific moisture and temperature thresholds, or treated with approved alternatives (debarking, steam, etc.), can also satisfy ISPM 15 without heat treatment or fumigation. These methods are less common but acceptable if the treatment is properly documented.
The critical requirement for all three methods: proof of treatment. Every pallet, crate, or piece of wood packaging must carry the official IPPC marking -- a stamp or ink mark showing the treatment method, country code, and facility registration number. Without the marking, the shipment is non-compliant, regardless of whether the wood was actually treated.
DAFF and MPI enforcement: what happens when non-compliant timber arrives
Australia's Department of Agriculture, Fisheries and Forestry (DAFF) and New Zealand's Ministry for Primary Industries (MPI) do not give forwarders the benefit of the doubt on ISPM 15.
When a timber container arrives without proper IPPC markings or with documentation that doesn't match the wood in the container, the inspection protocol is straightforward:
Visual inspection: Officers check every visible piece of wood packaging for IPPC marks. Unmarked pallets trigger immediate non-compliance flags.
Documentation verification: Treatment certificates are cross-checked against the facility registration number. If the certificate references a treatment facility that is not registered in the importing country's system, it is rejected.
Quarantine hold: Non-compliant wood is held in quarantine. The cargo cannot proceed to its destination.
Corrective action: The forwarder must choose one of three paths:
- Re-export the entire shipment at the forwarder's cost ($3,000-$5,000 depending on port and destination)
- Treat the wood in-country ($1,500-$3,000 for heat treatment at a licensed facility)
- Destroy the contaminated wood (rare, but mandated for shipments with active pest damage)
After corrective action is complete, inspection is repeated. If the shipment still fails -- which it will if the original wood was destroyed but replacement pallets are also unmarked -- the entire cargo can be sent back to origin.
Common failure points: what actually gets flagged
Not all ISPM 15 failures are obvious. Here are the patterns that trigger the most frequent rejections:
Unmarked pallets
This is the most common failure. Pallets treated in low-cost origin countries sometimes arrive without visible IPPC stamps. The treatment may have occurred -- the facility may be legitimate -- but without the mark, DAFF and MPI classify the wood as non-compliant. The mark is required, not optional.
Expired treatment certificates
ISPM 15 treatment certificates are typically valid for 12-14 months from the date of treatment. A certificate dated January 2025 is still valid in April 2026, but a certificate from January 2024 is expired. Expired certificates are treated as missing documentation -- non-compliant, hold the shipment.
Mixed-origin wood packaging
A single container with pallets from multiple origins -- some heat-treated in Thailand, some fumigated in Vietnam, some from domestic stock -- creates a compliance nightmare. Each piece of wood must be traceable to its specific treatment. If the documentation doesn't account for every pallet or crate in the container, or if one source is untreated, the entire shipment is flagged.
Facility registration mismatches
The treatment facility number on the IPPC mark must match an officially registered facility in the exporting country's system. If a facility was de-registered, closed, or never registered with the proper authorities, the mark is invalid even if the treatment actually occurred. Buyers in low-cost origin countries sometimes source wood from facilities operating outside official channels -- and the marks, while genuine-looking, do not verify.
Damaged or faded markings
If the IPPC mark is worn, faded, or damaged during shipping, inspectors may struggle to read the facility number. If the number cannot be confirmed, the marking is considered incomplete. This is particularly common in tropical climates where pallets sit in ports for weeks before shipment, and weathering takes its toll.
The financial impact: $5K-$12K per non-compliant shipment
Breaking down the cost of an ISPM 15 failure:
- Re-export logistics: $3,000-$5,000 (ocean freight, port handling, documentation rework)
- In-country treatment: $1,500-$3,000 (if the shipper chooses to treat rather than re-export)
- Port demurrage: $800-$1,500 (container sitting at wharf during quarantine hold, typically 3-5 days)
- Inspection re-run and documentation: $200-$500
- Lost revenue on delayed delivery: $500-$2,000 (rescheduled voyage, customer penalties)
For a typical 40-foot container, total cost of ISPM 15 non-compliance: $5,000-$12,000.
This is not absorbed by the cargo owner alone. Freight forwarders who guaranteed compliance, signed off on documentation, or sourced non-compliant wood often eat a significant portion of this cost.
How AI pre-screening catches ISPM 15 flags before goods reach the border
The highest-risk ISPM 15 failures are predictable. Specific origin countries have higher non-compliance rates. Certain treatment facilities are known to operate outside official channels. Specific commodity-origin combinations carry elevated risk.
Pre-screening timber shipments before documentation is finalized and containers are loaded allows forwarders to:
- Flag high-risk origins and request certified treatment documentation from known-good facilities
- Verify facility registration against official databases before accepting the shipment
- Identify mixed-origin pallets and source replacement wood from single verified facilities
- Confirm certificate validity before release to the border
- Demand complete documentation and IPPC markings before the shipment reaches the port
Each intervention eliminates a common failure point. A forwarder running 30 timber containers per month can reduce ISPM 15-related holds by 40-70% through proactive pre-screening -- saving $8,000-$25,000 annually in re-export and treatment costs.
What this means for your business
ISPM 15 compliance is not a suggestion from DAFF and MPI. It is a hard gate. One unmarked pallet, one expired certificate, one mixed-origin mix-up, and you are looking at a five-figure correction.
The forwarders who keep their margins intact are not the ones with the best luck. They are the ones who screen timber shipments before they commit. Use our free biosecurity risk checker to assess individual timber shipments before they're documented and loaded. It takes 90 seconds, requires no sign-up, and will tell you whether a particular origin-commodity route is likely to face ISPM 15 flags -- so you can source compliant wood and proper documentation before the container ever reaches the wharf.
Related tools: Beyond ISPM 15, freight forwarders face $83,000-$215,000 in annual hidden biosecurity compliance costs. The Hidden Cost of Biosecurity Compliance ->. For a comparison of the tools available to evaluate this year -- Best Biosecurity Compliance Tools 2026 ->.