What's the difference between a hot spring and a public bathhouse? How to distinguish between a super public bathhouse and a natural hot spring.

Onsen refers to "hot spring water," while sento refers to "public bathhouse."

Under the Hot Spring Law, a hot spring is defined as warm water, mineral water, or steam that springs from underground and has a source temperature of 25°C or higher, or contains one of the specified substances in a standard amount or more. Even if the temperature is below 25°C, it can still be considered a hot spring if it meets the component standards.

On the other hand, the Public Bathhouse Law defines a public bathhouse as a facility that allows the public to bathe using hot water, seawater, hot springs, or other similar materials. In other words, public bathhouses can use not only hot springs but also heated water. Facilities commonly known as "sento" (public bathhouses) are a type of public bathhouse, and the distinction between them and those using natural hot springs is a separate issue.

Public bathhouses and super public bathhouses are both types of public baths, but they have different statuses.

The Ministry of Health, Labour and Welfare explains the scope of the Public Bath Act by dividing it into "general public baths" and "other public baths." General public baths are facilities used by local residents as necessary for health and hygiene in their daily lives, and bathing fees are regulated; these are commonly known as sento (public bathhouses).

Other public baths include health centers and spas for relaxation and recuperation, as well as baths and saunas in sports facilities. "Super sento" is a common term and does not represent the legal definition of a hot spring. Even if a facility has many baths, bedrock baths, restaurants, and relaxation facilities, whether or not it is a natural hot spring should be checked separately.

How to tell if a facility has natural hot springs other than by its name

The names "hot spring," "spa," "bathing," and "public bath" alone do not allow you to determine whether the facility uses hot spring water as defined by the Hot Spring Law. Check the following inside the facility, in the changing rooms, and on the official website.

Artificial carbonated baths, medicinal baths, and jet baths are attractive baths, but they are not the same as "natural hot springs." Conversely, even if a bath looks colorless and transparent, it may still be a hot spring under the Hot Spring Law. How to read spring water quality and analysis reportsGuide to 10 Types of Hot Spring Water Quality and Their CompositionIn can be confirmed.

Sometimes, a single facility may have both hot spring baths and heated water baths.

In large hot spring facilities, the open-air bath may use natural hot spring water, the indoor bath may use regular hot water, and other baths may use artificial carbonated springs or medicinal baths. Even if the entire facility advertises itself as using "natural hot springs," it doesn't necessarily mean that the same source of hot spring water is used for all the baths.

If your main purpose is to soak in the hot springs, compare the names of the baths with the information displayed. If your main purpose is a sauna, relaxation, meal, or family stay, compare not only the number of hot spring baths but also the facilities and available hours. It's also important not to uniformly rank facilities based solely on whether or not they have natural hot springs.

Don't judge a place solely by its name, such as "hot spring," "spa," or "bath."

Even if a facility name includes "onsen" (hot spring), it doesn't necessarily mean that all the baths used are from the same source. Also, some facilities with names like "sento" (public bath) or "yudokoro" (bathhouse) use natural hot spring water drawn from underground. "Spa" is a general term used to describe the facilities and how to spend time there, and is not a classification name under the Hot Spring Law.

Before making a reservation or visiting, search the official website for the "name of the hot spring," "water quality," "hot spring component analysis report," and "bathtubs using natural hot spring water." Descriptions such as "hot spring atmosphere," "hot spring style," "artificial hot spring," and "recreated hot spring components" do not necessarily mean that it is a natural hot spring. Prioritize the analysis report and detailed facility description over short headlines in advertisements.

The conditions for using the large public baths at ryokans (Japanese inns) and day-use hot spring facilities are different.

The large public baths at ryokans (Japanese inns) are sometimes for overnight guests only, and even if they use hot spring water, they are not necessarily public baths that outside visitors can freely use. Conversely, the same ryokan may accept day visitors for bathing during limited hours. The reception, usage hours, rest areas, towels, and available bathtubs may differ between overnight guests and day visitors.

Don't assume that "it's a hot spring inn so you can use it for a day trip" or "it's a public bathhouse so no reservation is needed." Check the operating hours for the date and time you plan to use the facilities. Private baths and family baths may require separate reservations and additional charges, and these may not be included in the admission fee for the main bath.

Differences in fees, bathing tax, and opening hours

Regular public baths have a pricing system based on the assumption of daily use by the local community, while super sento (large public baths) and health spas have different pricing depending on the facilities, length of stay, towels, loungewear, and bedrock baths. The price level is not determined solely by whether or not it uses hot springs.

Facilities that utilize hot springs may charge a bathing tax, but the conditions vary depending on the municipality, facility type, usage fee, and age. Sometimes it's included in the bathing fee, and sometimes it's paid separately.Guide to Hot Spring Tax Amount and Payment MethodsPlease check with.

Checklist for your first visit to a public bathhouse

• Name of the bath that uses natural hot spring water, and whether or not a hot spring water analysis report is available.
• Is it for overnight guests only, or can day visitors also use it?
• Last entry and exit times, closing days, and entry restrictions during peak hours.
• Does the bathing fee include towels, loungewear, bedrock bath, and rest area?
• Cash, refundable coins, and cashless payment options are available for shoe lockers and lockers.
• Amenities such as shampoo, soap, and hair dryer
• Is re-entry permitted after leaving the building?
• Facility rules regarding tattoos, children, sauna, and food/drinks.

For short bathing sessions, prioritize the last check-in time and available amenities; for half-day stays, focus on rest areas, meals, and re-entry options; and if your goal is natural hot springs, prioritize the individual bath displays. Don't just compare prices; choose based on the total facilities you need for your purpose to avoid disappointment.

When looking for information in foreign languages, search for Onsen and Sento separately.

In English descriptions, natural hot springs are sometimes referred to as "Onsen," and local public baths as "Sento" or "public bath." However, translations alone cannot determine the legal classification of a facility or the type of water used in all the baths. It is also important to check detailed descriptions such as "natural hot spring," "hot spring analysis," and "bath information."

If you are unsure at the reception, please ask your questions separately, such as "Which baths use natural hot spring water?", "Can I use the facilities for a day trip?", and "Are towels included in the price?".

How to choose based on your travel purpose

• Experience the local everyday culture:Check the opening hours, amenities, and payment methods before heading to the public bath.
• Enjoy the quality of the hot spring water:Look for natural hot spring facilities with clear ingredient analysis reports and separate bath-type displays.
• Spend a relaxing half-day:Go to a public bathhouse or health spa that has dining, relaxation, sauna, etc.
• Enjoy accommodation and meals as well:Check the availability of rooms, meals, and the public baths at the hot spring inn.
• Short bath time:Prioritizing distance from the station, last check-in time, and towel sales.

At all facilities, the basics are the same: wash your body before entering the bathtub, do not put towels in the water, and avoid taking photos. For more details...Japanese hot spring and bathhouse etiquettePlease Confirm.