Transformer oil is of low toxicity. However, a small percentage of older transformers (manufactured before 1978) contain polychlorinated biphenyls (PCBs) at extremely low concentrations.
Transformer oil is not readily biodegradable. The cleanup of oil spills following a leak is carried out to minimise the impact on the environment.
The clean-up process involves:

The overall clean-up process can take between seven and thirty days depending on the complexity of the clean-up that is required.
For more information contact:
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Page update on 9 March 2007