The council's environmental enforcement team was called out to the scene in Moss Road, Heaton-with-Oxcliffe on Thursday, May 28.
They found a caravan full to the brim with household waste.
A council spokesperson said: "Whilst evidence is being gathered by our officers as to who this little lot belongs to, we're urging anyone who may have information which could lead to the culprit being caught to get in touch.
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"Call customer services on 01524 582491, email [email protected] or complete the online reporting form at www.lancaster.gov.uk/fly-tipping.
"Your details will be treated as confidential."