In both the UK and Hong Kong, tap water is available, yet the cultural practices surrounding its consumption differ significantly. While Britons drink directly from the tap, Hongkongers are taught from a young age to boil water for safety. Many Hongkongers who move to the UK initially continue to boil their water, but over time, they often begin to waver: their British counterparts drink tap water without issue, and they themselves consume it regularly when dining out. The issue lies not in the water itself, but in the underlying systems.
The UK’s water supply system is designed with the assumption that water is safe to drink immediately. Water companies must consistently meet stringent microbiological and chemical standards, with clear protocols for sampling, monitoring, and accountability. Chlorine is used to suppress bacteria rather than for excessive disinfection, aiming for safety rather than merely providing a sense of reassurance. The risk is managed at the system level, rather than being left to individual users.
In contrast, Hong Kong’s system operates on an opposite logic. Although the treatment level at water plants is high, the system assumes that once water enters a building, residents will boil it again. This assumption allows for risks to persist in the later stages. Issues such as aging buildings, mixed materials in internal pipes, and varying retention times in rooftop or underground tanks lead to inconsistent management quality. These problems are not addressed by the system but are instead left to households to mitigate with an electric kettle.
Thus, boiling water in Hong Kong is not necessarily due to unsafe source water, but rather because the system places the ultimate responsibility on residents. While boiling can kill bacteria, it does not eliminate metals or chemicals. Over time, through experience and public education, the act of boiling has been simplified to a universal answer, becoming an instinctive response.
However, this instinct is contradicted daily—especially in restaurants. In the UK, whether at a café, pub, or formal restaurant, when one requests tap water, what is served is cold water directly from the tap, unboiled and untreated. This practice is common among both Britons and Hongkongers living in the UK. Few question whether the water has been boiled, as in public settings, people implicitly trust the system to manage the risks.
This reality is both harsh and honest. If one can accept drinking tap water in restaurants or in environments controlled by third parties, it becomes difficult to rationally maintain the belief that ‘boiling water at home is essential for safety.’ The restaurant’s plumbing may not be newer than one’s own, nor is the distance the water travels necessarily shorter; the only difference lies in psychological positioning—whether one trusts the system.
Ultimately, the decision to boil water is no longer merely a health issue but a matter of trust. The UK has institutionalized risk, while Hong Kong has personalized it. When daily behaviors consistently affirm the trustworthiness of a particular system, habits will inevitably change; if they do not, what remains is merely emotional inertia.
The system determines not only whether water can be consumed directly but also whether individuals are willing to set aside their electric kettles.
