There could be a rise in hate crime and public disorder if the UK leaves the EU without a deal, according to Haringey Council.
The document also forecasts a high likelihood of a spike in hate crime as Brexit occurs.
It adds there could be severe disruption to supplies and services if the UK leaves the EU without a deal.
Other risks include a blow to council finances, disruption to food and medical supplies and problems hiring staff in key areas such as social care.
The People’s Vote Campaign has pulled together documents from a range of London boroughs outlining the risks Brexit could pose.
Common problems highlighted in the reports include shortages of fuel, food and essential medicines.
Chuka Umunna, MP for Streatham, said: “These documents reveal the truth that Boris Johnson’s Government is desperate to hide from the public - No Deal would be disastrous for London as well as for the rest of the country.
“It’s frankly shocking that a former Mayor of London would be so reckless in his willingness to impose such an awful outcome on our city.
“No Deal is not what anyone voted for, whether they voted Leave or Remain in 2016. No-one voted for less money for the NHS, possible shortages of food and medicine, waste piling up on the streets or an increased risk of civil disorder.
“Brexiters promised a brighter future for London and for the whole UK, but what they are delivering is the exact opposite.”
The 2017 Conservative manifesto included a commitment to aim for a deal with the European Union and a “smooth, orderly Brexit”.
But the chances of the UK crashing out without a deal rose sharply after Boris Johnson became Prime Minister on July 24.
Mr Johnson has said he wants to strike a deal with the EU but vowed the UK would leave “do or die” on October 31.
On Tuesday (September 3), rebel Tories and opposition MPs launched a bid to stop the PM pursuing a no-deal Brexit.
Haringey Council has been taking action to ensure it can lessen the impact of any disruption caused by Brexit.
It has also set up a dedicated webpage with information and support for businesses and residents here, which is available here: https://www.haringey.gov.uk/news-and-events/latest-news/haringey-and-brexit.
A Government spokesperson said: “We need to get ready for Brexit on October 31 and local government has a vital role to play in that.
“£77 million has already been allocated to local areas and we have stepped up our preparedness significantly in recent weeks.
“We are speaking regularly to councils and local partners, including through a delivery board and a network of nine regional lead chief executives, and every council will designate a Brexit Lead Officer to work with central government to intensify their local preparations.”