One of the most common situations encountered during cargo surveys involves discovering mold on bagged cargo when a container or cargo hold is opened. This is frequently seen with agricultural commodities, animal feed, powdered chemicals, fertilizers, and other products shipped in bags.
The immediate reaction is often:
“The cargo became moldy because water entered the container during the voyage.”
It is an understandable assumption.
However, in marine cargo surveying, the presence of mold simply indicates that the cargo has been exposed to conditions favorable for fungal growth. It does not, by itself, prove that water entered during transportation or that the carrier is liable.
This is why professional surveyors base their conclusions on evidence—not assumptions.
One Observation, Multiple Possible Causes
A container carrying bagged raw materials is opened at the discharge port.
Several bags are found with visible mold on their outer surfaces, while some bags also show signs of discoloration and caking.
The initial observation is straightforward:
Some of the cargo bags are moldy.
But this observation alone does not establish the cause.
Several possibilities must be considered, including:
- The cargo was packed with excessive moisture content.
- The bags provided insufficient moisture protection.
- Condensation (“container sweat”) developed during the voyage.
- The cargo had been stored under humid warehouse conditions before shipment.
- Rainwater exposure occurred during loading operations.
- Water entered the container or cargo hold during transportation.
Each of these scenarios can produce mold on bagged cargo, yet each leads to a different conclusion regarding liability.
What a Marine Surveyor Actually Investigates
Rather than focusing solely on the mold itself, a surveyor examines the overall condition of the shipment.
Typical areas of investigation include:
- The distribution pattern of the mold—whether it is localized or widespread.
- The condition of the bags, including signs of water staining, tearing, or mechanical damage.
- Evidence of water ingress on the container walls, roof, or floor.
- Signs of condensation beneath the container roof.
- Ventilation conditions and weather experienced during the voyage.
- Available records of the cargo’s moisture content prior to shipment.
- Storage conditions before loading.
Only by assessing these factors together can the true source of the moisture be determined.
One Small Detail Can Change the Entire Conclusion
In one survey case, approximately forty bags located in the center of the container were found to be moldy, while the bags near the container doors remained completely unaffected.
Initially, the cargo owner alleged that the container had leaked during the voyage.
However, the investigation revealed that:
- No evidence of water ingress was found.
- The door seals remained intact.
- No water marks were present on the sidewalls or floor.
- Clear signs of condensation were observed beneath the container roof.
- The affected bags were concentrated in an area where temperature fluctuations and limited air circulation had encouraged moisture condensation.
Taken together, these findings were more consistent with container condensation (“container sweat”) than with external water entering the container.
Had the investigation relied solely on the mold, the cause would likely have been misidentified.
The Critical Question Is Not Whether the Bags Are Moldy
The real question is:
Where did the moisture come from, and when was it introduced?
Two shipments may exhibit nearly identical mold damage.
Yet one may result from:
- Cargo packed with excessive moisture.
- Inadequate storage conditions before shipment.
- Condensation developing during the voyage.
- Actual water ingress during transportation.
The visible condition may be the same.
The cause—and ultimately the allocation of liability—may be entirely different.
The Value of Technical Investigation
A survey report stating:
“Several bags were found moldy upon opening the container.”
merely records the condition of the cargo.
What the parties actually need is:
- The mechanism by which the mold developed.
- The source of the moisture.
- The stage at which the risk materialized.
- A chain of technical evidence supporting the conclusions.
Only then can the survey findings provide a reliable basis for resolving a cargo claim.
Conclusion
Mold on bagged cargo is a symptom, not a cause.
In marine cargo surveying, the surveyor’s responsibility is not simply to confirm that mold exists, but to determine where the moisture originated, when it developed, and how it led to the damage.
In every cargo claim, the observed condition tells us what is present.
Only evidence can explain what actually happened—and who is responsible.
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