The ban, for nearly a million customers, prevented the use of hosepipes in most circumstances.
Parts of Hampshire, including the area covered by Portsmouth Water, were not affected.
In principle, people breaching the ban could be fined up to £1,000, although Southern Water previously declined to comment on whether that had ever happened.
The firm said wetter weather in September and October had alleviated the emergency, together with a programme of leak repairs.
It said future developments would make supplies more resilient, including a planned new reservoir at Havant Thicket, water recycling schemes and importing water from other regions.
Neighbouring Thames Water said on Monday it would continue with a hosepipe ban in parts of Berkshire, Gloucestershire, Oxfordshire and Wiltshire.