敵「銭湯は汚いぞ！他人のエキスが染み込んでるのによく入れるな…」
A provocative online opinion claiming Japanese public baths (sento) are unhygienic, "soaked in other people's essence," has sparked widespread debate. Responses vary from defenses emphasizing thorough cleaning and their cultural value as a source of healing, to acknowledgments that it might not suit germaphobes. This discussion offers a glimpse into perspectives on public bath hygiene, cultural significance, and individual sanitation views.
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Act on Public Baths
The Act on Public Baths in Japan is a law that stipulates the hygienic management and facility standards for public bathhouses. This includes sento (traditional public baths), onsen (hot spring facilities), and super sento (large-scale bath complexes), aiming to ensure the health and safety of users. The law prescribes a wide range of items, such as water quality standards for bathwater, mandatory installation of filtration and disinfection systems, frequency of cleaning for changing rooms and bathrooms, and ventilation equipment standards. For example, bathwater must, in principle, be completely replaced daily, and if a circulation filtration system is used, detailed standards are set for hourly filtration capacity and chlorine disinfection concentration. Specifically, the residual chlorine concentration is usually set at 0.2 mg/L or higher to thoroughly counter pathogens like Legionella bacteria. Based on this law, each local government establishes ordinances to provide more detailed standards and guidance, conducting regular water quality inspections and facility site visits. It is precisely because of these strict legal and administrative regulations that a foundation is built for many users to safely use public bathhouses. The opinion that "sento are dirty" suggests a potential lack of full understanding of the actual hygiene management based on this Act on Public Baths; knowing the legal standards and actual operations can significantly change one's view of sento.
Collective Hygiene Consciousness and Public Health
Collective hygiene consciousness refers to the common understanding and behavioral patterns concerning disease prevention and health maintenance within society as a whole. The concept of public health, in particular, signifies scientific and organizational efforts to protect the health of not just individuals but the entire group, with pillars such as infectious disease prevention, environmental hygiene improvement, and safe water supply. Public facilities like sento embody precisely this crucial aspect of public health. Because an unspecified number of people use these places, thorough hygiene management is required from the operators, and a certain level of moral conduct and rule adherence is expected from users. For instance, customs like rinsing oneself before entering the bath and not putting towels in the bath are not merely manners but wisdom ingrained to protect collective hygiene. Historically, in times when infectious diseases were prone to spread, public baths were a valuable means of maintaining cleanliness and also served as community communication hubs. In modern times, with the widespread availability of home baths and diversifying individual hygiene perceptions, more people feel psychological resistance to sharing public spaces, as seen in the expression "other people's essence." However, from a public health perspective, properly managed sento fulfill a vital role as social infrastructure, providing cleanliness and health to many people while minimizing infection risks.
Evolution of Bathing Culture and Sento's Modern Value
Japanese bathing culture has long played a significant role in purifying mind and body, promoting health, and serving as a place for social interaction. Prototypes like steam baths existed in the Jomon period, and with the introduction of Buddhism, "onshitsu" (temple baths) became popular. Public sento greatly developed in the Edo period. At that time, due to inadequate sanitation, public bathhouses were indispensable for maintaining cleanliness. However, after the period of rapid economic growth, the penetration rate of home baths rapidly increased, causing the number of sento to drastically decline. From approximately 20,000 sento nationwide in the 1960s, the number has now fallen below 2,000. Meanwhile, large-scale hot spring facilities like super sento and health lands emerged, diversifying bathing culture by pursuing entertainment and relaxation. In modern times, sento are finding new value not just as a functional place to wash one's body, but as community hubs, retro spots where history and culture can be experienced, or places for individual stress relief and rejuvenation. Particularly, there is active movement to meet modern needs while preserving traditional charm, such as "designer sento" renovated primarily in urban areas, and sento that have enhanced their sauna facilities amidst the sauna boom. This current debate highlights the gap between the historical and cultural value of sento and diverse modern hygiene perceptions, offering an interesting perspective on what role sento will play in the future.