Best Bicarbonate Spring (Beauty Water) Hot Springs Ranking
99 hot springs
Bicarbonate springs are rich in sodium and calcium bicarbonate. Soaking in this water helps remove dead skin cells and excess oil, leaving skin feeling smooth and soft, earning it the nickname 'the beauty bath.'
The bicarbonate ions emulsify oils and dirt on the skin's surface, washing them away for a refreshingly clean feeling after bathing. It is also said to help with dry skin and chronic skin conditions, making it popular among visitors seeking beauty benefits.
Ranking Criteria
Kamiyu Onsen Kawara no Yu
Sulfur-containing - Sodium - Bicarbonate Spring (Hydrogen Sulfide Type)
Tsuta Hot Spring
ナトリウム・カルシウム－塩化物・炭酸水素塩泉・硫酸塩線
Okukinu Hot Spring Kaniyu
Sulfur-containing - Sodium - Chloride - Bicarbonate Spring
Kawayu HotSpring Sennin Air Bath
Calcium （ - Magnesium ） - Sodium - Bicarbonate - Chloride Spring
Hokkein Hot Spring
Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring
Nikkou swa onsen
Sulfur-containing - Sodium - Chloride Spring / Sodium - Chloride - Bicarbonate Spring / Sulfur-containing - Sodium - Chloride - Bicarbonate Spring (Hydrogen Sulfide Type)
Takegawara Onsen
Sodium - Calcium （ - Magnesium ） - Chloride - Bicarbonate Spring
Busshozan Onsen Tenpyoyu
Sodium - Bicarbonate - Chloride Spring
Totsukawa Onsen Iori-no-Yu
Sodium - Bicarbonate - Chloride Spring
Kamiyu Onsen Kamiyuso
Sodium - Bicarbonate Spring
Gaga Onsen
Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring
Nakamiya Onsen Nishiyama Ryokan
Sodium - Chloride - Bicarbonate Spring
Shirahone Hot Spring Awanoyu
Sulfur-containing - Calcium （ - Magnesium ） - Bicarbonate Spring (Hydrogen Sulfide Type)
Shirahone Hot Spring Katsurano-yu Maruei Ryokan
Sulfur-containing - Calcium （ - Magnesium ） - Bicarbonate - Sulfate Spring (Hydrogen Sulfide Type)
Koakazawa Hot Spring Rakuyokan
Iron(II)-containing - Calcium （ - Magnesium ） - Sodium - Bicarbonate - Chloride Spring
Kotan-no-yu Open-air Bath
Sodium - Bicarbonate Spring
Ogawa hotspring
Sodium - Bicarbonate - Chloride Spring
Hatogayu Onsen
Sodium - Chloride - Bicarbonate Spring
Hito Nagano-yu (Nagayu Onsen)
Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring
Nagayu Onsen Daimaru Ryokan
Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring
Nigorigo Onsen Yunotanisou
Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring
Natural Carbonated Hot Spring Nomon-yu
含鉄・二酸化炭素－カルシウム－炭酸水素塩泉
Totsukawa Onsen Hotel Subaru
Sodium - Bicarbonate Spring
Nakayamadaira Onsen Takuhide
Sulfur-containing - Sodium - Bicarbonate - Sulfate Spring (Hydrogen Sulfide Type)
Hitoyoshi Onsen Motoyu
Sodium - Bicarbonate - Chloride Spring
Kurokawa Onsen Ryokan Sanga
Simple Sulfur Spring / Sodium - Chloride - Sulfate - Bicarbonate Spring
Myoken Onsen Orihashi Ryokan
Sodium - Bicarbonate Spring
Shiohitashi Onsen Ryoma Park
Sodium - Bicarbonate Spring
Shiramine Onsen Soyu
Sodium - Bicarbonate Spring
Fukaya Onsen Motoyu Ishiya
Sodium - Bicarbonate Spring
Tomuraushi Onsen Higashitaisetsu-so
Sodium - Chloride - Bicarbonate Spring
Shiriuchi Onsen Ryokan (Utopia Warakuen)
Sodium - Chloride - Bicarbonate Spring
Otari Onsen Yamada Ryokan
Sodium - Bicarbonate Spring
Amakazari Onsen Amakazari-so
Sodium - Bicarbonate Spring
Shirahone Host Spring Public Open-air Bath
Calcium （ - Magnesium ） - Bicarbonate Spring
Yawatahama Kuroyu Onsen Minato-yu
Iron(II)-containing - Sodium - Bicarbonate Spring
Maintopia Besshi Besshi Onsen - Tenku no Yu
Sodium - Calcium （ - Magnesium ） - Chloride - Bicarbonate Spring
Tsurugi no Yado Iwato
Sulfur-containing - Sodium - Chloride - Bicarbonate Spring
HOTEL RIVIERA Shishikui
Sodium - Bicarbonate Spring
Kamiyama Onsen Hotel Shikinosato & Iyashi-no-Yu
Sodium - Chloride - Bicarbonate Spring
Iyakei Onsen Hotel Hikyou no Yu
Sodium - Bicarbonate Spring
Hasami Onsen Yujirou
Sodium - Bicarbonate Spring
Minabe Onsen Tsurunoyu
含二酸化炭素－ナトリウム－炭酸水素塩泉
Ryujin Onsen Motoyu
Sodium - Bicarbonate Spring
Ryujin Onsen Shimogoten
Sodium - Bicarbonate Spring
Tara Takezaki Onsen
Sodium - Bicarbonate - Chloride Spring
Matsukawa Valley Onsen Takinoyu Shiawase no Mori
Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring
Togayama Onsen Tennyo no Yu
含二酸化炭素－カルシウム（・マグネシウム）－炭酸水素塩泉
Naradanosato Onsen Jotei-no-yu
Sodium - Chloride - Bicarbonate Spring
Ureshino Onsen Kisenkan
Sodium - Bicarbonate - Chloride Spring
Yudan Onsen Yudan-no-Yado
Sodium - Calcium （ - Magnesium ） - Chloride - Bicarbonate Spring
Sanbonyanagi Onsen
Sodium - Chloride - Bicarbonate Spring
Yunoami Onsen Shikanoyu Matsuya
Iron(II)-containing - Sodium - Bicarbonate - Chloride Spring
Uguisudani Onsen Takenoha
Sodium - Chloride - Bicarbonate Spring
Hiwa Onsen Akebonoso
Sodium - Bicarbonate - Chloride Spring
Higashi-Naruko Onsen Isazen Ryokan
Sodium - Bicarbonate Spring / Sodium - Bicarbonate - Chloride - Sulfate Spring
Higashi-Naruko Onsen Baba Onsen
Sodium - Bicarbonate Spring
Higashi-Naruko Onsen Kuroyu no Takatomo Ryokan
Sulfur-containing - Sodium - Bicarbonate Spring (Hydrogen Sulfide Type) / Sodium - Bicarbonate Spring / Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring
Kinjo Onsen Motoyu
Sodium - Bicarbonate - Chloride Spring / Sodium - Chloride - Bicarbonate Spring
Oyadani no Yu
Sodium - Bicarbonate - Chloride Spring / Simple Hot Spring
Chugu Onsen Yakushi-no-Yu
Sodium - Chloride - Bicarbonate Spring
Yuyado Kuroyuri, Hakusan Chugu Onsen
Sodium - Chloride - Bicarbonate Spring
Hakusan Onsen Nagai Ryokan
Sodium - Chloride - Bicarbonate Spring
Seki Onsen Asahiya Ryokan
Sodium - Chloride - Bicarbonate Spring
Amakazari Onsen Amakazari Sanso
Sodium - Bicarbonate - Chloride Spring
Sasakura Onsen Ryuunso
Sodium - Bicarbonate Spring
Takizawa Onsen Takizawakan
Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring
Shiobara Motoyu Onsen Hitou-no-Yado Gensenkan
Sulfur-containing - Sodium - Chloride - Bicarbonate Spring (Hydrogen Sulfide Type)
Shiobara Motoyu Onsen Oidekan
Sulfur-containing - Sodium - Chloride - Bicarbonate Spring (Hydrogen Sulfide Type)
Hinotani Onsen Misugi Resort
Sodium - Bicarbonate Spring
Terme VILLA Chura-yu (The Beach Tower Okinawa)
Sodium - Bicarbonate Spring
Ryokan Takeyashiki (Yakushiyu Onsen)
Sodium - Bicarbonate Spring
Yunoshima Onsen
Sodium - Bicarbonate - Chloride Spring
Youroukeikoku Onsen Kiyomoto
Sodium - Chloride - Bicarbonate Spring
Onjuku no Yu
Sodium - Bicarbonate Spring
Nomizo Onsen Senju no Yu
Sodium - Bicarbonate Spring
Kameyama Onsen Hotel
Sodium - Chloride - Bicarbonate Spring
Settsukyo Hananosato Onsen Sansuikan
Alkaline Simple Hot Spring / Sodium - Bicarbonate Spring
Sankukai Onsen
Sulfur-containing - Sodium - Bicarbonate Spring (Hydrogen Sulfide Type)
Fushio Onsen Fushioukaku
Sodium - Bicarbonate Spring
Okumizuma Onsen
Sodium - Bicarbonate Spring
Onoe Onsen Ryokan Beniayu
Sodium - Bicarbonate Spring
Hira Shofuku Onsen Holiday Afternoon
Sodium - Bicarbonate Spring
Sugatani Onsen
Iron(II)-containing - Calcium （ - Magnesium ） - Bicarbonate Spring
Takarabune Onsen Yumoto Kotobuki
単純鉄（Ⅱ）泉（炭酸水素塩型）
Keikoku no Yado Nihiki no Oni
Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring
Hakusui Kosen Kurodakeso
含二酸化炭素－カルシウム（・マグネシウム）－炭酸水素塩泉
Fujiya Farmhouse Inn (Shinhirayu Onsen)
Simple Hot Spring / Sodium - Bicarbonate Spring
Nigorigo Onsen Ryokan Yumotokan
Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring
Fukuji Onsen Yumoto Choza
Simple Hot Spring / Sodium - Bicarbonate Spring
Fukuji Onsen Yamazato no Iori Soene
Simple Hot Spring / Sodium - Bicarbonate Spring
Kamata Onsen
Sodium - Bicarbonate - Chloride Spring
Musashi-Koyama Onsen Shimizu-yu
Sodium - Bicarbonate Spring / Sodium - Chloride Strong Salt Spring
Yunosawa Kousen
Sodium - Bicarbonate Spring
Yumura Onsen Arayu
Sodium - Bicarbonate - Chloride - Sulfate Spring
Hijiori Onsen Yuyado Motokawarayu
Sodium - Bicarbonate - Chloride Spring
Higashi-Naruko Onsen Ryokan Ohnuma
Sodium - Bicarbonate Spring / Sodium - Bicarbonate - Chloride Spring
Ureshino Onsen
Sodium - Bicarbonate - Chloride Spring
Tokachigawa Onsen
Sodium - Chloride - Bicarbonate Spring
Comparison of Ranked Hot Springs
| Name | Prefecture | Water Quality | Source-fed | Onsen Value |
|---|---|---|---|---|
| Kamiyu Onsen Kawara no Yu | Nara | Sulfur-containing - Sodium - Bicarbonate Spring (Hydrogen Sulfide Type) | Natural Source Flow | 5 |
| Tsuta Hot Spring | Aomori | ナトリウム・カルシウム－塩化物・炭酸水素塩泉・硫酸塩線 | Natural Source Flow | 5 |
| Okukinu Hot Spring Kaniyu | Tochigi | Sulfur-containing - Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | 5 |
| Kawayu HotSpring Sennin Air Bath | Wakayama | Calcium （ - Magnesium ） - Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 5 |
| Hokkein Hot Spring | Oita | Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring | Natural Source Flow | 5 |
| Nikkou swa onsen | Tochigi | Sulfur-containing - Sodium - Chloride Spring, Sodium - Chloride - Bicarbonate Spring, Sulfur-containing - Sodium - Chloride - Bicarbonate Spring (Hydrogen Sulfide Type) | - | 5 |
| Takegawara Onsen | Oita | Sodium - Calcium （ - Magnesium ） - Chloride - Bicarbonate Spring | Natural Source Flow | 4 |
| Busshozan Onsen Tenpyoyu | Kagawa | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 4 |
| Totsukawa Onsen Iori-no-Yu | Nara | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 4 |
| Kamiyu Onsen Kamiyuso | Nara | Sodium - Bicarbonate Spring | Natural Source Flow | 4 |
| Gaga Onsen | Miyagi | Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring | Natural Source Flow | 4 |
| Nakamiya Onsen Nishiyama Ryokan | Ishikawa | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | 4 |
| Shirahone Hot Spring Awanoyu | Nagano | Sulfur-containing - Calcium （ - Magnesium ） - Bicarbonate Spring (Hydrogen Sulfide Type) | Natural Source Flow | 4 |
| Shirahone Hot Spring Katsurano-yu Maruei Ryokan | Nagano | Sulfur-containing - Calcium （ - Magnesium ） - Bicarbonate - Sulfate Spring (Hydrogen Sulfide Type) | Natural Source Flow | 4 |
| Koakazawa Hot Spring Rakuyokan | Nagano | Iron(II)-containing - Calcium （ - Magnesium ） - Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 4 |
| Kotan-no-yu Open-air Bath | Hokkaido | Sodium - Bicarbonate Spring | Natural Source Flow | 4 |
| Ogawa hotspring | Toyama | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 4 |
| Hatogayu Onsen | Fukui | Sodium - Chloride - Bicarbonate Spring | Circulation System | 4 |
| Hito Nagano-yu (Nagayu Onsen) | Oita | Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring | Natural Source Flow | 3 |
| Nagayu Onsen Daimaru Ryokan | Oita | Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring | Natural Source Flow | 3 |
| Nigorigo Onsen Yunotanisou | Gifu | Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring | Natural Source Flow | 3 |
| Natural Carbonated Hot Spring Nomon-yu | Nagasaki | 含鉄・二酸化炭素－カルシウム－炭酸水素塩泉 | Natural Source Flow | 3 |
| Totsukawa Onsen Hotel Subaru | Nara | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Nakayamadaira Onsen Takuhide | Miyagi | Sulfur-containing - Sodium - Bicarbonate - Sulfate Spring (Hydrogen Sulfide Type) | Natural Source Flow | 3 |
| Hitoyoshi Onsen Motoyu | Kumamoto | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 3 |
| Kurokawa Onsen Ryokan Sanga | Kumamoto | Simple Sulfur Spring, Sodium - Chloride - Sulfate - Bicarbonate Spring | Natural Source Flow | 3 |
| Myoken Onsen Orihashi Ryokan | Kagoshima | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Shiohitashi Onsen Ryoma Park | Kagoshima | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Shiramine Onsen Soyu | Ishikawa | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Fukaya Onsen Motoyu Ishiya | Ishikawa | Sodium - Bicarbonate Spring | - | 3 |
| Tomuraushi Onsen Higashitaisetsu-so | Hokkaido | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | 3 |
| Shiriuchi Onsen Ryokan (Utopia Warakuen) | Hokkaido | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | 3 |
| Otari Onsen Yamada Ryokan | Nagano | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Amakazari Onsen Amakazari-so | Nagano | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Shirahone Host Spring Public Open-air Bath | Nagano | Calcium （ - Magnesium ） - Bicarbonate Spring | Natural Source Flow | 3 |
| Yawatahama Kuroyu Onsen Minato-yu | Ehime | Iron(II)-containing - Sodium - Bicarbonate Spring | - | 3 |
| Maintopia Besshi Besshi Onsen - Tenku no Yu | Ehime | Sodium - Calcium （ - Magnesium ） - Chloride - Bicarbonate Spring | Circulation System | 3 |
| Tsurugi no Yado Iwato | Tokushima | Sulfur-containing - Sodium - Chloride - Bicarbonate Spring | - | 3 |
| HOTEL RIVIERA Shishikui | Tokushima | Sodium - Bicarbonate Spring | Circulation System | 3 |
| Kamiyama Onsen Hotel Shikinosato & Iyashi-no-Yu | Tokushima | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | 3 |
| Iyakei Onsen Hotel Hikyou no Yu | Tokushima | Sodium - Bicarbonate Spring | Circulation System | 3 |
| Hasami Onsen Yujirou | Nagasaki | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Minabe Onsen Tsurunoyu | Wakayama | 含二酸化炭素－ナトリウム－炭酸水素塩泉 | Natural Source Flow | 3 |
| Ryujin Onsen Motoyu | Wakayama | Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Ryujin Onsen Shimogoten | Wakayama | Sodium - Bicarbonate Spring | Circulation System | 3 |
| Tara Takezaki Onsen | Saga | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 3 |
| Matsukawa Valley Onsen Takinoyu Shiawase no Mori | Nagano | Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring | Natural Source Flow | 3 |
| Togayama Onsen Tennyo no Yu | Hyogo | 含二酸化炭素－カルシウム（・マグネシウム）－炭酸水素塩泉 | Circulation System | 1 |
| Naradanosato Onsen Jotei-no-yu | Yamanashi | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | - |
| Ureshino Onsen Kisenkan | Saga | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | - |
| Yudan Onsen Yudan-no-Yado | Aomori | Sodium - Calcium （ - Magnesium ） - Chloride - Bicarbonate Spring | Natural Source Flow | - |
| Sanbonyanagi Onsen | Aomori | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | - |
| Yunoami Onsen Shikanoyu Matsuya | Ibaraki | Iron(II)-containing - Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | - |
| Uguisudani Onsen Takenoha | Ibaraki | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | - |
| Hiwa Onsen Akebonoso | Hiroshima | Sodium - Bicarbonate - Chloride Spring | Circulation System | - |
| Higashi-Naruko Onsen Isazen Ryokan | Miyagi | Sodium - Bicarbonate Spring, Sodium - Bicarbonate - Chloride - Sulfate Spring | Natural Source Flow | - |
| Higashi-Naruko Onsen Baba Onsen | Miyagi | Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Higashi-Naruko Onsen Kuroyu no Takatomo Ryokan | Miyagi | Sulfur-containing - Sodium - Bicarbonate Spring (Hydrogen Sulfide Type), Sodium - Bicarbonate Spring, Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring | Natural Source Flow | - |
| Kinjo Onsen Motoyu | Ishikawa | Sodium - Bicarbonate - Chloride Spring, Sodium - Chloride - Bicarbonate Spring | Partial Natural Flow | - |
| Oyadani no Yu | Ishikawa | Sodium - Bicarbonate - Chloride Spring, Simple Hot Spring | Natural Source Flow | - |
| Chugu Onsen Yakushi-no-Yu | Ishikawa | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | - |
| Yuyado Kuroyuri, Hakusan Chugu Onsen | Ishikawa | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | - |
| Hakusan Onsen Nagai Ryokan | Ishikawa | Sodium - Chloride - Bicarbonate Spring | Partial Natural Flow | - |
| Seki Onsen Asahiya Ryokan | Niigata | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | - |
| Amakazari Onsen Amakazari Sanso | Niigata | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | - |
| Sasakura Onsen Ryuunso | Niigata | Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Takizawa Onsen Takizawakan | Gunma | Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring | Partial Natural Flow | - |
| Shiobara Motoyu Onsen Hitou-no-Yado Gensenkan | Tochigi | Sulfur-containing - Sodium - Chloride - Bicarbonate Spring (Hydrogen Sulfide Type) | Natural Source Flow | - |
| Shiobara Motoyu Onsen Oidekan | Tochigi | Sulfur-containing - Sodium - Chloride - Bicarbonate Spring (Hydrogen Sulfide Type) | Natural Source Flow | - |
| Hinotani Onsen Misugi Resort | Mie | Sodium - Bicarbonate Spring | - | - |
| Terme VILLA Chura-yu (The Beach Tower Okinawa) | Okinawa | Sodium - Bicarbonate Spring | Partial Natural Flow | - |
| Ryokan Takeyashiki (Yakushiyu Onsen) | Kagawa | Sodium - Bicarbonate Spring | Circulation System | - |
| Yunoshima Onsen | Aichi | Sodium - Bicarbonate - Chloride Spring | Partial Natural Flow | - |
| Youroukeikoku Onsen Kiyomoto | Chiba | Sodium - Chloride - Bicarbonate Spring | - | - |
| Onjuku no Yu | Chiba | Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Nomizo Onsen Senju no Yu | Chiba | Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Kameyama Onsen Hotel | Chiba | Sodium - Chloride - Bicarbonate Spring | Partial Natural Flow | - |
| Settsukyo Hananosato Onsen Sansuikan | Osaka | Alkaline Simple Hot Spring, Sodium - Bicarbonate Spring | - | - |
| Sankukai Onsen | Osaka | Sulfur-containing - Sodium - Bicarbonate Spring (Hydrogen Sulfide Type) | Natural Source Flow | - |
| Fushio Onsen Fushioukaku | Osaka | Sodium - Bicarbonate Spring | Circulation System | - |
| Okumizuma Onsen | Osaka | Sodium - Bicarbonate Spring | - | - |
| Onoe Onsen Ryokan Beniayu | Shiga | Sodium - Bicarbonate Spring | - | - |
| Hira Shofuku Onsen Holiday Afternoon | Shiga | Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Sugatani Onsen | Shiga | Iron(II)-containing - Calcium （ - Magnesium ） - Bicarbonate Spring | Natural Source Flow | - |
| Takarabune Onsen Yumoto Kotobuki | Shiga | 単純鉄（Ⅱ）泉（炭酸水素塩型） | Partial Natural Flow | - |
| Keikoku no Yado Nihiki no Oni | Oita | Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring | Natural Source Flow | - |
| Hakusui Kosen Kurodakeso | Oita | 含二酸化炭素－カルシウム（・マグネシウム）－炭酸水素塩泉 | Natural Source Flow | - |
| Fujiya Farmhouse Inn (Shinhirayu Onsen) | Gifu | Simple Hot Spring, Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Nigorigo Onsen Ryokan Yumotokan | Gifu | Calcium （ - Magnesium ） - Sodium - Bicarbonate - Sulfate Spring | Natural Source Flow | - |
| Fukuji Onsen Yumoto Choza | Gifu | Simple Hot Spring, Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Fukuji Onsen Yamazato no Iori Soene | Gifu | Simple Hot Spring, Sodium - Bicarbonate Spring | Natural Source Flow | - |
| Kamata Onsen | Tokyo | Sodium - Bicarbonate - Chloride Spring | Circulation System | - |
| Musashi-Koyama Onsen Shimizu-yu | Tokyo | Sodium - Bicarbonate Spring, Sodium - Chloride Strong Salt Spring | Partial Natural Flow | - |
| Yunosawa Kousen | Ibaraki | Sodium - Bicarbonate Spring | - | - |
| Yumura Onsen Arayu | Hyogo | Sodium - Bicarbonate - Chloride - Sulfate Spring | - | - |
| Hijiori Onsen Yuyado Motokawarayu | Yamagata | Sodium - Bicarbonate - Chloride Spring | - | - |
| Higashi-Naruko Onsen Ryokan Ohnuma | Miyagi | Sodium - Bicarbonate Spring, Sodium - Bicarbonate - Chloride Spring | - | - |
| Ureshino Onsen | Saga | Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | - |
| Tokachigawa Onsen | Hokkaido | Sodium - Chloride - Bicarbonate Spring | Natural Source Flow | - |
Frequently Asked Questions
Q.Why does bicarbonate spring water make skin feel so smooth?
A.Bicarbonate ions emulsify dead skin cells and oils on the skin's surface, washing them away. Many bathers describe the sensation as similar to having used soap.
Q.How often should I bathe to get the beauty benefits?
A.Daily bathing is fine, but prolonged soaking can dry out the skin, so moisturizing afterward is recommended.
Q.Are bicarbonate springs the same as carbon dioxide springs?
A.No. Bicarbonate springs are rich in bicarbonate ions, while carbon dioxide springs are rich in dissolved carbonic acid gas. Despite the similar names, their components and effects differ.
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