When it comes to transformer oil disposal you need really need to know the laws and environmental protection standards. As with all oil, transformer oil is a contaminate if spilled and not recycled properly, especially if the oil has the PCB pollutant in it. Usually the older transformer models carry PCB’s, but the oil must be tested to ensure environmental safety. If the oil contains PCB’s then it must be dealt with through a proper environmental services company. Whether or not the oil tests free of PCB’s, you need to recycle or dispose of it through a company that deals in transformer oil recycling and disposal. There are some transformer oil disposal companies who are adequately outfitted to deal with the testing of your oil AND all the proper disposal techniques whether it contains PCB’s or not.
Overall, this is not a do-it-yourself project; Oil seepage into ground water and soil resources can carry hefty fines for you and hefty prices to the environment as well.
Obviously, you cannot simply dump out your unwanted transformer oils into a sewer or drain. But with a click of your computer, you will quickly see that there are 100’s of local and nationwide transformer oil disposal companies easily within reach.