As Singapore grapples with a dry spell, it is enhancing measures to get large water users to save water.

From next year, users who consume more than 5,000 cubic meters of water a month - two Olympic swimming pools' worth - must submit water efficiency management plans to national water agency PUB.

They will have to do so by June next year, and provide updates every year. They also have to install private meters to measure water consumption in each part of their premises.

The measures was announced in Parliament by Environment and Water Resources Minister Vivian Balakrishnan on Tuesday.

Some 600 large water users, such as semiconductor manufacturers, power generation companies, and hotels, will be subject to this requirement, which will be progressively expanded to include more users, he added.

Already, some 35 per cent of those have submitted voluntary water efficiency management plans.

The non-domestic sector accounts for some 55 per cent of Singapore's water consumption, but this is projected to rise to 70 per cent in 2060.