RM14: 1.0 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in RM14, RM14 3RD, stands 1.0 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, RM14 1TR, stands 53 m above it.
- Ground at eight in ten of its postcodes: between 15 m and 33 m, measured from Ordnance Datum; the middle one stands at 20 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Havering.