A journalist and certified onsen sommelier recounts her experiences visiting hot springs in Japan and offers advice for foreign tourists on navigating cultural norms and bathhouse rules.
The hot spring pool at Kuroneiwa-buro on the Izu Peninsula is located near the Pacific Ocean. A foreign visitor was observed scooping water directly from the source, which exceeded 50°C, instead of using a bucket from the bath. This highlights a common challenge: navigating the unspoken rules of Japan's beloved onsen culture.
Key Insights into Onsen Culture
Japan boasts over 25,000 natural thermal water sources. The Onsen Law requires water to emerge at a minimum temperature of 25°C or contain specific minerals above regulated levels.
- Strict Schedules: Many onsen inns operate on strict schedules for meals and bath cleaning to maintain hospitality standards. Foreign guests occasionally disrupt these schedules.
- Communal Nudity: Communal nudity is traditional; men and women are generally separated, though some mixed-gender baths remain.
- Tattoo Policies: Tattoo policies vary; some onsens ban tattoos due to historical associations with organized crime, while others accept them.
- Unspoken Rules: Common unspoken rules include: showering before entering the bath, not allowing towels or hair to touch the water, and observing the mood of others.
Rare Onsen Experiences
- Shin Tamagawa Onsen (Akita): Water with pH 1.2 (highly acidic). Soaking is limited to short periods (under three minutes).
- Hanayama Onsen (Wakayama): Water rich in iron forms a crust overnight, which bathers break through in the morning.
- Shichirida Onsen (Oita): Naturally carbonated water with high CO2 concentration; requires ventilation.
Writer's Background
The writer is a Japanese-born journalist who lived in the US and later returned to Japan. She became a certified onsen sommelier, traveled over 3,000 km across Japan, and worked at a 170-year-old inn (Soene) in Fukuji Onsen.