What is one specific water issue Singapore faces/faced?

Singapore, being a small island nation, has always faced the challenge of water scarcity. Here are the steps to understand this issue:

1. Limited Water Sources: Singapore has limited natural fresh water sources and a high population density, which makes it difficult to meet the water demand.

2. Dependence on Imported Water: To supplement its water supply, Singapore has been importing water from Malaysia under two water agreements. However, this dependence on another country for water supply poses a strategic challenge.

3. High Water Demand: With rapid urbanization and industrialization, the demand for water in Singapore has been increasing. This puts further pressure on the limited water resources.

4. Climate Change: Climate change and variability also pose a significant challenge to Singapore's water security. Changes in rainfall patterns can affect the availability of water.

To address these challenges, Singapore has adopted a diversified water supply strategy known as the "Four National Taps" - local catchment water, imported water, NEWater (recycled water), and desalinated water. This strategy, along with water conservation efforts, has helped Singapore to largely overcome its water scarcity issue.