Peter Mandelson will be fined up to £300 after he was pictured urinating in the street last year.
The Royal Borough of Kensington and Chelsea (RBKC) has confirmed that it is planning to issue the fixed penalty notice once it has found an appropriate address for the disgraced peer.
Images first published by the Daily Mail showed the former US ambassador relieving himself against a wall in Notting Hill shortly before 11pm on 12 November.
Lord Mandelson is also facing a separate police probe over his links to convicted paedophile Jeffrey Epstein.
On Friday, RBKC confirmed it was planning to issue the fine – as first reported by the Sun – once a “suitable address” had been obtained for the peer.
Individuals are liable for a £300 fine if they are found urinating in public in the borough, but the charge can be reduced to £150 if paid within two weeks of receiving it.
When the images of Lord Mandelson urinating in the street were first published last year, he offered his “profuse apologies”.
“I was stood up by two Uber drivers and kept waiting in the street for half an hour, and was bursting. There is no disguising my embarrassment”, he told the Daily Mail.
Lord Mandelson was sacked last year after new revelations about the depth and extent of his relationship with Epstein were revealed in the media, raising significant questions over Sir Keir Starmer’s decision to appoint him in the first place.
Both Lord Mandelson and Andrew Mountbatten-Windsor, the former Duke of York, were arrested last month on suspicion of misconduct in public office over their connections with the paedophile financier.
Both have since been released under investigation, and prosecutors are now “providing early investigative advice” to the police as they carry out their inquiries, the Crown Prosecution Service (CPS) said last week.
Meanwhile, MPs moved in February to force the publication of tens of thousands of documents amid questions over how much was known about Lord Mandelson’s links to Epstein before the peer was handed the Washington job.
The first tranche of documents related to the decision was published earlier this month after a demand for transparency by MPs, with more to follow.
Lord Mandelson will be asked to supply messages from his personal phone as part of the disclosure of files, after concerns were raised that exchanges relating to the appointment could be lost after the theft of former No 10 chief of staff Morgan McSweeney’s mobile phone last year.
Lord Mandelson’s representatives have been contacted for comment.