When it comes to water, Singapore may be a victim of its own success, says world renowned water expert Asit Biswas.

Water supplies are drying up at an unprecedented rate. But with the authorities here so efficient at making such effects invisible at the turn of the tap, Singapore residents continue to take a free flow of fresh, clean water for granted, Professor Biswas believes.

So if he had his way, he would increase water prices here by 30 per cent immediately.

"In my view, water prices should have been increased a long time ago," he said, pointing out that they have remained stagnant for nearly 16 years.

Biswas, who a decade ago won the Stockholm Water Prize - considered the water industry's Nobel Prize - for his outstanding contributions to global water resource issues, added: "Singaporeans now use water profligately for all household chores, as well as for bathing and hygienic purposes."

According to national water agency PUB, the price of potable water for domestic households is currently about $1.50 (US$1.1) per cubic meter, or 1,000 liters, (not including GST) for households using 40 cubic m or less per month.

Each Singapore resident uses 150 liters of water per day, enough to fill almost two bathtubs.

This is far more than the usage in other cities with comparable standards of living, such as Estonia's capital Tallinn, Europe's most water-saving city, where each person uses 95 liters daily, Biswas pointed out.

Water usage can be cut easily by substituting a mop for floor washing, in place of high-pressure water jets often seen in housing estates, for instance, and by using non-potable water for watering plants.

His advice comes at a time when sustainable water demand has become imperative.

With climate change expected to show more pronounced effects, dry spells are only going to become more pronounced within the next two to four decades.

"Singapore needs to think in terms of drought. Analysis has indicated that there may be periods where we may have one- to three- year droughts in Singapore, Malaysia and Indonesia," said Biswas, who is also Distinguished Visiting Professor at the Lee Kuan Yew School of Public Policy, National University of Singapore (NUS).

Currently, Singapore gets about half of its water from Malaysia. Therefore, dry weather across the Causeway is a double whammy for the Republic.

Two months ago, Minister for the Environment and Water Resources Masagos Zulkifli revealed that Johor's Linggiu Reservoir was half empty. This is a far cry from a level of about 80 per cent at the start of last year.

The 55 sq km reservoir is five times larger than all of Singapore's reservoirs combined, and the Republic built it upstream of the Johor River in 1994, so that it can collect and release rainwater to push seawater back into the sea. This ensures that the river water is not too salty to be treated by the Singapore-run water treatment plant there.

Singapore residents, however, do not feel the impact of serious dry spells because the PUB runs desalination and Newater plants at high capacity to mitigate the impact of lower rainfall.

This cannot continue, said Prof Biswas, who advises 19 governments around the world, including China and Brazil, on water policy issues.

"Singapore has to move from supply management to thinking very seriously about how to manage the demands, both for the present and the future," he warned.

Besides, water prices now are not commensurate with rising household incomes and inflation, said Biswas, who is also the founder of the Third World Centre for Water Management in Mexico.

Sixteen years ago, the median employed resident household income here was $4,398. Water bills represented 0.69 per cent of income based on 20 cubic m of water monthly. But by 2014, the household income had increased to $8,292 and the water bill represented just 0.36 per cent of its monthly income.

When contacted, a PUB spokesman said the answer to long-term water sustainability is source diversification.

"We have to move towards drought-resistant sources like reuse (that is, Newater) and desalination. These, however, are more energy-intensive, and hence more expensive, sources of water," she said.

"Therein lies the challenge. We can become more resilient to climate change, but at the cost of expending more energy."

The PUB declined to say if it will be increasing water prices.

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