The EA said flood defences at Polperro in Cornwall were "overtopped" by "unprecedented" levels of floodwater.
BBC: Flood defences: Praise and criticism of new schemes
Millbrook, Polperro, Helston, Newlyn and Perranporth were among many areas affected by heavy and prolonged rain last month.
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At the height of the downpour, four severe flood warnings were in place, in Polperro, Helston, Perranporth and Lostwithiel.
BBC: Floods bring chaos to Cornwall after heavy rain
Devon and Cornwall Police said that across both counties 250 homes had been flooded, including properties in Millbrook and Polperro.
The only access route taking traffic as normal after the landslips was Polperro Hill on the western side, the council said.
BBC: Looe main access roads hit by landslips
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