Japanese Toilets: Technology and the Culture of Hygiene

You push open the door of a stall in a Tokyo shopping mall. Before your hand even reaches the light switch, a motion sensor has already detected your approach: the lid rises on its own, slow and silent, like an invitation. You freeze. In front of you, a wall-mounted control panel displays a dozen buttons adorned with pictograms you can't begin to decipher. A water jet? A dryer? Music? You sit down, and the seat is warm, a gentle, enveloping warmth that feels almost comforting. A subtle fragrance neutralizes any odor. Somewhere, a speaker plays the sound of running water for reasons you don't yet understand. Welcome to Japan, the country where even toilets are an art form.

The story might raise a smile, but it masks a deeper truth. Japanese toilets are neither a gimmick nor a technological eccentricity. They are a cultural marker as significant as kaiseki cuisine, temple architecture, or the art of paper folding. Behind the comfort of a heated seat and the precision of a water jet lie centuries of history, a philosophy of cleanliness rooted in Shinto and Buddhism, an industry worth billions of dollars, and a relationship with the human body that has no equivalent in the West. To understand Japanese toilets, you have to travel back through time, cross eras, and be willing to look at what most cultures prefer to ignore.

From Pit to Throne: A History of Toilets in Japan

The Ancient Era and the Kawaya

Long before the invention of the Washlet, the Japanese already had a unique relationship with bodily hygiene. The earliest Japanese toilets bear a poetic name: kawaya (厠, sometimes written 河屋, literally "the house above the river"). These rudimentary latrines, built over a stream or a pit, date back to the Jomon period (roughly 14,000 to 300 BCE). The principle was simple: the current carried waste away, a natural drainage system found in many ancient civilizations.

Archaeological excavations at Fujiwara-kyo (藤原京), Japan's imperial capital from 694 to 710, revealed latrine remains of surprising sophistication. Wooden drainage channels, plank-lined pits, drainage systems fed by diverted waterways: by the eighth century, Japanese sanitary engineering had moved well beyond a simple hole in the ground. These findings, published by the Nara National Research Institute for Cultural Properties, show that collective concern for hygiene is anything but modern in Japan.

Yet the most remarkable aspect of Japanese sanitary history may be agricultural recycling. Human excrement, called shimogoe (下肥, literally "fertilizer from below"), was systematically collected and used as fertilizer in rice paddies and vegetable gardens. This system, which may seem revolting to modern sensibilities, was in fact an ecological cycle of remarkable efficiency. While medieval Europe was tossing waste out of windows and spreading epidemics, Japan was turning its waste into an agricultural resource, closing the loop of organic matter with a rationality that modern circular economy advocates would readily endorse.

The Edo period (1603-1868) took this logic to its extreme. In major cities like Edo (present-day Tokyo), Osaka, and Kyoto, a genuine trade in human waste developed between urban and rural areas. Landlords of tenement buildings sold their tenants' excrement to farmers from surrounding regions. Prices varied based on perceived quality: waste from wealthy neighborhoods, where diets were richer and more varied, fetched higher prices than waste from poorer districts. Legal disputes even erupted over who owned a tenant's excrement: the building's owner or the tenant. This scatological economy, extensively documented by historians such as Hanley Susan B. in Everyday Things in Premodern Japan, speaks to a sanitary pragmatism unmatched in the West.

Alongside the domestic kawaya, Zen Buddhism developed its own approach to toilets. The setchin (雪隠), the latrines of Zen temples, was a codified space where even the most mundane act became a meditative practice. Monks were required to enter in silence, follow a precise protocol (which foot to step in with first, how to arrange their clothing, how to clean themselves) and maintain full awareness throughout the entire process. In esoteric Buddhist tradition, a protective deity watches over this space: Ususama Myoo (烏枢沙摩明王), a fire god capable of purifying any defilement. His statue or image still adorns the toilets of many temples in Japan today, a reminder that bodily cleanliness and spiritual purity are never separated in Japanese thought.

The Meiji Era and Western Influence

Japan's opening to the world in 1868, with the Meiji Restoration, upended every aspect of Japanese society, including the most intimate. The new government, fascinated by Western modernity, set about importing not only European industrial and military technologies but also sanitary standards. Flush toilets, a British invention refined during the nineteenth century, began appearing in government buildings, luxury hotels, and the residences of the elite.

The first ceramic toilets manufactured on Japanese soil date from the early twentieth century. But the transition was slow, far slower than in other domains. For decades, Japan lived in a coexistence of two sanitary worlds: squat toilets, which the Japanese call washiki (和式, "Japanese style"), and seated Western-style toilets, called yoshiki (洋式, "Western style"). Well into the 1960s and 1970s, the vast majority of Japanese households still used washiki toilets. Schools, train stations, and public buildings were almost exclusively equipped with this model.

The shift happened gradually from the 1970s and 1980s onward, driven by urbanization, the modernization of housing, and above all by one invention that changed everything: the Washlet. Today, over 90% of Japanese households are equipped with yoshiki toilets, and washiki models survive only in certain older buildings, a few rural schools, and the most outdated public restrooms. The reversal is total: in just two generations, Japan went from squatting to sitting on the most technologically sophisticated throne on the planet.

TOTO and the Washlet Revolution

The story of the Washlet is inseparable from that of one company: TOTO (東洋陶器, Toyo Toki, literally "Oriental Ceramics"). Founded in 1917 in Kitakyushu, in the north of Kyushu island, by Okura Kazuchika (大倉和親, 1875-1955), TOTO is today the world's largest manufacturer of sanitary equipment. The name "TOTO" is an abbreviation of Toyo Toki, a shorthand that has become one of Japan's most recognizable brands.

Okura Kazuchika was the son of Okura Kihachiro (大倉喜八郎), one of the great industrialists of the Meiji era. Educated in Europe, the young Kazuchika had observed Western sanitary fixtures and understood that Japan, in the midst of modernization, would need a domestic sanitary ceramics industry. He first established a sanitary division within the Noritake group (famous for its tableware porcelain), and the entity later became independent under the name Toyo Toki. From the outset, TOTO was not content to simply copy Western models: the company sought to adapt them to Japanese customs and expectations.

TOTO's first major moment on the national stage came in 1964, during the Tokyo Olympics. Japan, eager to project an image of modernity to the world, invested heavily in its infrastructure. TOTO supplied the sanitary equipment for the Olympic facilities, a global showcase that cemented its reputation. But the real revolution was still to come.

In 1980, TOTO launched the Washlet G (ウォシュレット), the world's first mass-market cleansing toilet seat. The concept: a toilet seat equipped with a retractable nozzle capable of spraying a jet of warm water to clean the user, replacing toilet paper. The word "Washlet" is a registered trademark of TOTO that has become a generic term in Japan for all cleansing toilet seats, much like "Kleenex" for tissues or "Band-Aid" for adhesive bandages in the English-speaking world.

The development story of the Washlet has become legendary in Japanese industrial history. TOTO engineers spent months testing the water jets on themselves to determine the optimal spray angle, the ideal temperature (between 37 and 40 degrees Celsius), the right pressure, and the exact position of the nozzle. Over 300 employees voluntarily participated in the trials, a level of dedication that says a great deal about Japanese corporate culture. The result of this meticulous research: a water jet at a patented 43-degree angle that hits its target with a precision requiring no manual adjustment.

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In Japanese industrial philosophy, perfection is not found in the spectacular. It hides in details nobody sees: in the angle of a water jet calculated to the exact degree, in the temperature of a seat calibrated so the body feels neither heat nor cold, only comfort.

The features of a modern Washlet, the product of over forty years of continuous improvement, form a list that leaves most Western visitors stunned. The rear water jet is adjustable in position, pressure, and temperature. A bidet function, with a separate and gentler jet, is specifically designed for feminine hygiene. A warm air dryer allows the user to skip toilet paper entirely. The seat is heated, with a temperature adjustable to individual preference. A built-in deodorizer, using a catalytic filter, neutralizes odors in real time. The lid closes automatically at a speed calculated to prevent any noise. A motion sensor raises the lid as the user approaches. And the nozzle cleans itself automatically before and after each use, with water sterilized through electrolysis.

The numbers are staggering. In 2023, over 80% of Japanese households were equipped with a Washlet or equivalent cleansing seat, according to data from the Cabinet Office of Japan. Since the first model launched in 1980, TOTO has sold over 60 million units worldwide. The company employs more than 34,000 people and generates annual revenue exceeding 600 billion yen (roughly four billion euros). In the Japanese cleansing seat market, TOTO dominates with approximately 60% market share, followed by INAX (now part of the LIXIL group) and Panasonic. But in the minds of Japanese people, Washlet and TOTO are synonymous, and the word itself has entered the common dictionary.

The Symphony of Buttons: Decoding the Control Panel

For foreign visitors, the Washlet's control panel is an object of fascination tinged with apprehension. Mounted on the wall or integrated into the armrest, it displays a row of buttons whose pictograms seem to belong to an unknown alphabet. Yet every button has a specific function, and understanding them means entering the logic of Japanese-style comfort.

The most common button bears a pictogram of a downward-pointing water jet, accompanied by the characters おしり (oshiri, "posterior"): this is the main wash function. Next to it, a button marked ビデ (bide, "bidet") activates the feminine cleansing jet. A third button, often featuring a wind symbol, triggers the warm air dryer. Plus and minus buttons adjust jet pressure and water temperature. And then there is the most important button of all, the one the uninitiated frantically searches for in moments of panic: the 止 (tome, "stop") button, which immediately halts any active function.

But the most culturally revealing device on the panel is arguably the Otohime (音姫, literally "sound princess"). Invented by TOTO in 1988, the Otohime is a small device that emits the sound of running water when pressed, designed to mask the natural sounds produced during toilet use. The invention addressed a very real problem: before the Otohime, many Japanese women, anxious about being overheard, would flush the toilet continuously while using it. The waste was enormous, estimated at several thousand liters of water per person per year in some buildings. The Otohime, by providing an artificial sound cover, drastically reduced this consumption. Initially mocked by some, the device is now present in virtually all women's public restrooms in Japan, and increasingly in unisex stalls as well.

Standardization of pictograms is a more recent concern. For decades, each manufacturer used its own symbols, creating constant confusion for users, especially foreign tourists. In 2017, the Japan Sanitary Equipment Industry Association (日本レストルーム工業会) adopted a standardized set of pictograms shared by all manufacturers: a stylized posterior for rear washing, a female silhouette for the bidet, waves for the dryer, a square for stop. This standardization, largely motivated by the influx of tourists expected for the Tokyo 2020 Olympics, illustrates just how seriously toilets are taken in Japan, seriously enough to mobilize an entire industry around harmonizing symbols.

High-end models push the boundaries of what seems possible. TOTO's Neorest series, the brand's flagship line, offers automatic opening and closing of both the lid and the seat (completely hands-free), a built-in LED night light inside the bowl (for navigating in the dark without turning on the lights), an automatic flush triggered simply by standing up, an ewater+ misting cleaning system that uses electrolyzed water to disinfect the bowl after each use, and on certain models, a urine analysis function capable of measuring sugar levels and transmitting data to a physician. The price of these models can exceed $10,000, but in a country where toilets are considered a wellness space in their own right, there is no shortage of buyers.

Public Restrooms: When Architecture Gets Involved

The cleanliness of Japanese public restrooms is a source of perpetual wonder for foreign visitors. In JR railway stations, in the subway stations of Tokyo and Osaka, in shopping malls, in konbini (コンビニ, convenience stores open 24 hours a day), and even in certain parks, public restrooms are maintained at a level that would put most private Western establishments to shame. Cleaned multiple times a day, equipped with Washlets, stocked with toilet paper, sometimes fitted with changing tables and small child seats so a parent can use the toilet without worry, they embody a conception of public space radically different from the one prevailing in Europe or North America.

This tradition of care for public restrooms reached its pinnacle with the Tokyo Toilet Project (東京トイレプロジェクト), an initiative launched in 2020 by the Nippon Foundation (日本財団). The concept: invite sixteen internationally renowned architects and designers to create public restrooms in Tokyo's Shibuya district. The stated goal was to transform these often-neglected spaces into genuine architectural works, accessible to all, and to demonstrate that design can change how we perceive the most ordinary places.

Among the most striking creations, the transparent restrooms by Ban Shigeru (坂茂, born 1957), winner of the Pritzker Prize in 2014, attracted worldwide attention. Installed at Yoyogi Fukamachi Park and Haru-no-Ogawa Park, these cabins are entirely glazed, composed of colored smart-glass panels (blue, green, red depending on the location) that allow passersby to see inside: the toilets are clean, the space is available. But the moment the user locks the door, an electric current instantly turns the glass opaque, transforming the cabin into a perfectly private cocoon. The concept is crystal clear: resolve the two fundamental anxieties associated with public restrooms (the fear of filth and the fear that someone is already inside) through transparency that converts to opacity. Ban Shigeru, known for his humanitarian architecture (emergency cardboard shelters after the 1995 Kobe earthquake), has stated that this project illustrates his conviction that architecture must serve everyone, without exception.

Ando Tadao (安藤忠雄, born 1941), another Pritzker laureate (1995) and the self-taught master of exposed concrete who became the world's most famous autodidact architect, designed circular restrooms in Japanese cypress wood (hinoki, 檜) for the same project at Jingu-dori Park. The round shape, unusual for a restroom, evokes a garden pavilion or a small shrine, deliberately blurring the line between the utilitarian and the sacred. Katayama Masamichi (片山正通), an interior designer known for his luxury boutiques, envisioned restrooms topped with a bright red canopy in Ebisu, turning the cabin into a cheerful visual landmark in the urban landscape. Fujimoto Sou (藤本壮介), whose architecture is defined by porosity between interior and exterior, created a structure of translucent white columns that filter light while preserving privacy, like a forest of petrified bamboo.

The Tokyo Toilet Project found an unexpected echo in cinema. In 2023, German filmmaker Wenders Wim (born 1945) directed Perfect Days, a film that follows the daily life of Hirayama, a public restroom cleaner in Shibuya, played by Yakusho Koji (役所広司, born 1956). The character, a former businessman who chose to take on this humble job, performs his work with meticulous care, finding in the repetition of daily gestures a form of fulfillment. Yakusho Koji received the Best Actor award at the Cannes Film Festival for this role, and the film was nominated for the Academy Award for Best International Feature Film. Perfect Days resonated with audiences worldwide by showing that dignity lies not in the prestige of a profession but in the attention one brings to what one does: a profoundly Japanese idea.

Train station restrooms deserve special mention. In major stations like Tokyo, Shinjuku, or Shin-Osaka, public restrooms are free, equipped with Washlets, and often feature a floor plan posted at the entrance showing the location of each stall, which stalls are free or occupied, and the availability of specific amenities (changing tables, wheelchair accessibility, ostomy facilities). Some newer stations even offer "powder rooms" (makeup touch-up areas) adjacent to the restrooms, fitted with illuminated mirrors and electrical outlets. The contrast with public restrooms in most of the world's major cities is striking.

A Cultural Obsession With Cleanliness

To understand why Japan has elevated toilets to an art form, you need to look at the spiritual roots of Japanese culture. Cleanliness in Japan is not merely a matter of hygiene: it is a moral value, a spiritual practice, and a social bond.

Shinto (神道), Japan's indigenous religion, rests on a fundamental opposition between kegare (穢れ, impurity, defilement) and kiyome (清め, purification). Kegare is not simply physical dirt: it is a state of spiritual disorder, a distance from the sacred. Death, blood, illness, but also disorder and neglect are sources of kegare. Kiyome, the act of purification, restores harmony between humans and the divine. This framework permeates all of Japanese life. At the entrance of every Shinto shrine, the temizu (手水), the water basin where worshippers rinse their hands and mouths before praying, materializes this transition from the profane to the sacred. Purifying salt (mori-shio, 盛り塩), placed at the entrance of restaurants and homes, serves the same function. In Shinto, to clean is to pray.

This spiritual dimension of cleanliness manifests concretely in education. Soji (掃除, cleaning) is a daily practice in every Japanese school, from kindergarten through middle school. Each day after classes, students clean their own classrooms, hallways, staircases, and restrooms. This is not a punishment, nor a chore imposed by budget constraints: it is a deliberate educational pillar, written into school curricula since the Meiji era. Soji teaches children respect for shared spaces, collective responsibility, and the principle that nobody is above cleaning. A school principal, a government minister, an emperor: all of them, at some point in their lives, have scrubbed toilets on their hands and knees.

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In Japanese thought, no place is beneath dignity. A school hallway, a subway station, a public restroom stall: every space deserves the same care, because every space reflects the people who inhabit it.

The connection to Omotenashi (おもてなし), the Japanese concept of total hospitality, is direct. Omotenashi is the art of caring for others before they express a need, of anticipating their comfort, of creating an environment where they feel welcomed down to the smallest detail. Spotless restrooms in a restaurant, a hotel, or a public space are a form of Omotenashi: they tell the user, without a single word, that their dignity and comfort have been thought of in advance. Conversely, dirty or neglected restrooms are seen as an affront, a serious failure of hospitality. In Japan, judging a restaurant by the state of its restrooms is not a quirk: it is a reliable indicator of the attention the establishment pays to its guests.

The relationship between the Japanese and toilet deities adds a surprising dimension to this picture. In Shinto, Kawaya no Kami (厠の神, the god of toilets) is a protective deity associated with fertility and childbirth. In Buddhism, Ususama Myoo (烏枢沙摩明王), mentioned earlier, is revered as the ultimate purifier. But it is a folk belief, passed from generation to generation, that best captures the Japanese attitude: cleaning your toilets with care and regularity brings prosperity, health, and beauty. This is not a fringe superstition; it is widely shared, even among perfectly modern and rational Japanese people, who see in it less a literal truth than a reminder of the importance of paying attention to ordinary things.

This belief found a striking cultural expression in 2010, when singer Uemura Kana (植村花菜, born 1983) released the song Toire no Kamisama (トイレの神様, "The God of Toilets"). The track, at an unusual length of nearly ten minutes, tells the autobiographical story of the singer as a child, whose grandmother explained that a very beautiful goddess lived in the toilets, and that cleaning them every day with devotion would make whoever did so beautiful. The song, carried by a simple melody and lyrics of disarming sincerity, struck a deep chord across Japan. It reached number three on the Oricon chart, was performed at the Kohaku Uta Gassen (the televised New Year's Eve music gala watched by tens of millions of Japanese viewers), and became a genuine cultural phenomenon. Thousands of testimonials poured in from people sharing that their own grandparents had passed down the very same belief. Toire no Kamisama did not create the myth: it revealed just how alive it still was.

The Washlet Conquers the World

For decades, the Washlet remained an almost exclusively Japanese phenomenon. Western tourists marveled at it, snapped photos of the control panel, recounted their misadventures with the water jet upon returning home, but the idea of installing one in their own bathroom barely crossed their minds. The Washlet was seen as an exotic curiosity, much like vending machines serving hot drinks or bullet trains running with flawless punctuality: admirable, but hard to transplant.

TOTO tried early on to break into international markets. As early as 1989, the company opened a showroom in New York on Madison Avenue to introduce its products to the American public. The reception was polite but reserved. The American market, attached to toilet paper and wary of any technology touching bodily intimacy, resisted for years. The first adopters were celebrities, tech enthusiasts, and people who had traveled to Japan: a narrow circle that struggled to build critical mass.

The first market to fall outside Japan was China. Starting in the 2000s, Chinese tourists visiting Japan discovered the Washlet and brought them home by the thousands. The phenomenon grew so large that it earned its own name: bakugai (爆買い, literally "explosive buying"), referring to the frenzied shopping of Chinese tourists in Japan. The Washlet consistently ranked among the top five most-purchased products, alongside cosmetics, medicine, and electronics. TOTO, INAX, and Panasonic fought fiercely to capture the enormous Chinese market, opening factories and showrooms in major Chinese cities. In 2015, Chinese economist Wu Xiaobo (吴晓波) published an essay that went viral, titled "The Chinese Go to Japan to Buy Toilet Seat Covers," which sparked a national debate about the inability of Chinese industry to produce comparable quality.

But it was an unforeseen event that truly accelerated the global adoption of the Washlet: the COVID-19 pandemic. In March 2020, a toilet paper shortage hit the United States, Australia, and several European countries, triggered by panic buying. Empty supermarket shelves made front-page news. In this context, the Washlet suddenly appeared not as an exotic gadget but as a practical solution: a device that eliminates dependence on toilet paper. Sales of cleansing toilet seats surged by over 200% in the United States in 2020. Brands like Tushy, BioBidet, and Brondell, which offered entry-level bidets adaptable to existing toilets, saw their revenues explode. TOTO, with its premium models, also rode the wave.

Cultural resistance in the West, however, remains real. There is the matter of modesty: the idea of a water jet touching intimate parts is still uncomfortable for many Westerners, raised in cultures where the relationship with the body is marked by reserve. There is also distrust of technology in intimate spaces: in a world where connected devices are regularly hacked, the idea of an electronic device in your toilet raises concerns (largely unfounded, but understandable). And there is the cost of installation: an entry-level Washlet runs between 300 and 500 euros, a high-end model can exceed 5,000 euros, and installation requires an electrical outlet near the toilet, which is not standard in Western bathrooms.

Despite these barriers, the momentum appears irreversible. European brands such as Geberit (Switzerland) and Duravit (Germany), along with American manufacturer Kohler, have launched their own lines of cleansing seats. Luxury hotels worldwide, from New York to Dubai to Paris, now equip their suites with Japanese toilets. The global cleansing seat market, valued at approximately five billion dollars in 2023, is expected to surpass eight billion by 2030.

The ecological paradox of the Washlet deserves examination. The device consumes electricity (to heat the water and seat, power the dryer and nozzle), which might seem at odds with contemporary environmental concerns. But this consumption is modest (on the order of 100 to 200 kilowatt-hours per year for a household) and must be weighed against the toilet paper savings it enables. Japan uses roughly 70% less toilet paper per capita than the United States. And toilet paper production is a silent ecological disaster: it devours millions of trees every year, consumes massive quantities of water and energy, and generates greenhouse gas emissions at every stage of the supply chain (production, transportation, packaging). The Natural Resources Defense Council estimated in 2019 that Americans alone consume more than 140 rolls of toilet paper per person per year. By reducing that consumption to a fraction, the Washlet may well be one of the simplest and most effective ecological choices the developed world could embrace.

Japanese toilets are not a gadget. They are not a technological eccentricity reserved for science fiction fans. They are the concrete expression of a philosophy of care, respect for the body, and hospitality that runs through every layer of Japanese culture. From the kawaya perched above a river to the $10,000 Neorest, from shimogoe recycled into rice paddies to a water jet calibrated to the exact degree, from the Zen monk meditating in the setchin to the restroom cleaner filmed by Wenders Wim: the same conviction has endured across centuries. There is no place beneath dignity, there is no trivial act, and the way a civilization treats its most intimate spaces says everything about it.