Confirmed Covid-19 cases for London topped 8,000 in a week, leaving the capital facing tighter restrictions announced within days.
Eight districts have now passed the key threshold of 100 new cases per week per 100,000 inhabitants.
Four more lie just below this level which is considered one of a series of potential trigger points for stricter measurements.
The new restrictions will likely apply city-wide, and the infection rate for the capital as a whole has risen to almost 90 cases per 100,000 residents.
London Mayor Sadiq Khan has warned the city that a level 2 crackdown , which would see a ban on indoor mixing between households, is likely days away from the announcement.
Ministers currently face far worse coronavirus hotspots in the North and Midlands but talks are also due on stricter restrictions for the capital.
Work and Pensions Secretary Therese Coffey told LBC radio: “If London needs to upgrade to level 2, it may not be at the moment.
Ealing has the highest Covid-19 rate in London with 136.9 cases per 100,000 in the week of October 9, with 468 cases, according to an analysis by the Evening Standard.
Richmond has a rate of 133.3 (264 cases), Hackney and the City of London area 124.8 (363 cases with the vast majority in Hackney), Redbridge 124.5 (380 cases), Harrow 114.7 ( 288 cases), Haringey 109.4 (294), Barnet 106.3 (421) and Hammersmith & Fulham 101 (187).
Four boroughs achieved a rate of at least 98, Hounslow, Kingston, Kensington & Chelsea and Wandsworth.
Numbers for Richmond and some other boroughs, especially wealthy areas, would be affected by a significant number of students from these regions tested positive in universities across the country but their cases being counted according to their district of origin.
Mr Khan told Sky News yesterday: “Across our city… the average for the past seven days is around 90 per 100,000. All the metrics I have, hospital admissions, occupancy rate intensive care units, number of elderly people with cases, disease prevalence, positivity are all going in the wrong direction.
“Which means, I’m afraid, it’s inevitable over the next few days London will have passed a trigger point to be in the second tier.”
The number of cases in London rose to 8,197 in the week to October 9, from 6,083 for the previous seven days.