Is water a sustainable resource?

It is actually incorrect to view resources as sustainable; the REAL question is what level and kind of human use keeps something sustainable. The difference between "sustainability" and not is the usage and demand, not the material.

Anything can become unsustainable due to improper (wasteful) usage habits and excessive population demand for a resource; in fact, the majority of pollution and sustainability problems in the modern world stem from this imbalance between availability and demand.

Water is a sustainable resource when managed properly. However, unsustainable practices such as over-extraction, pollution, and inefficient use can lead to water scarcity and degradation of water quality, threatening its sustainability. Therefore, sustainable water management practices are essential to ensure the long-term availability and quality of water resources.