Metropolitan Police has been charged with a £750,000 compensation claim by Transport for London for the riot damage.
Firms affected by the riots in August have claimed a bill of £200m from the Met.
Among the firms the biggest claim of one of the biggest claims is £5.2m from TfL.
Damages to the firm included £2.5m in fares and another £2.7m in repair bills including the double decker bus set alight in Croydon and the damage to lines and resulting service cancellation on the Croydon Tramlink.
A spokesman for Tfl said it would have to absorb the lost fares but was still able to claim some money as part of the Riot Act.
The Act makes the liability to pay for damage to buildings and their contents which have occurred in the course of a riot in London (excluding the City of London) on the Metropolitan Police Authority.
Besides, injury, destruction or stealing, to houses, shops and other buildings or their contents caused by any person involved in a riot.
As its investigation in the matter proceeds, Met expects to run up further costs from the riots which resulted in 3,300 offences being reported across 28 boroughs after disorder was sparked by the police shooting of Mark Duggan in Tottenham.
Peter Hendy, TfL commissioner, warned that with the emergence of full exyent of damage the bill for the damages might increase.