Few interventions in human history have saved as many lives as clean water and adequate sanitation. Long before antibiotics and advanced surgery, improvements in water supply and sewage systems dramatically reduced mortality from infectious diseases.

In this chapter, we explore water and sanitation as foundational pillars of public health. Safe drinking water prevents diarrhoeal diseases, cholera, typhoid, and parasitic infections. Sanitation infrastructure interrupts transmission pathways and protects entire communities.

We examine the global burden of inadequate water and sanitation - still disproportionately affecting low-income regions, informal settlements, and rural populations. The chapter highlights technological, behavioural, and governance solutions, from piped water systems and wastewater treatment to household-level interventions.

Climate change, urbanisation, and water scarcity introduce new challenges. Contamination risks, infrastructure maintenance, and inequitable access remain pressing concerns.

Water and sanitation represent both engineering achievements and moral commitments. They require long-term investment, cross-sector coordination, and political will.

Public health often works invisibly. Few notice the pipes beneath the city - until they fail.

Key Takeaways

* Clean water and sanitation dramatically reduce infectious disease burden.

* Diarrhoeal disease remains a leading cause of child mortality globally.

* Infrastructure investment produces population-wide benefits.

* Behavioural practices influence transmission risk.

* Rapid urbanisation strains water systems.

* Climate change affects water security and quality.

* Governance and maintenance are critical for sustainability.

* Equity in access remains a global challenge.

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