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Ryokan and onsen hotels in Kusatsu

Every stay in Kusatsu we can back with data: onsen analysis reports and facility details checked against the property’s own pages.

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Stays in Kusatsu

26 stays
Spring types from the analysis reports
  • Sulfur Spring14 stays
  • Acidic Spring10 stays
  • pH 1.7–2.4

Spring type and pH come from the main source of the 24 stays whose analysis report we have on file.

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  1. Naraya

    Naraya

    Kusatsu, Gunma

    • Rooms with private open-air bath
    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring · Free-flowing

    Sources & details
    • Tattoos OK if covered
    • Analysis report on file
    • Free-flowing (posted notice)
    • Private bath checked Oct 2026
    • Tattoo rule checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type; Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 240.6 mg/kg

    Source: in-room bath (kusatsu-naraya.co.jp) · private bath (kusatsu-naraya.co.jp) · tattoo rule (kusatsu-naraya.co.jp) · Checked May 31, 2026

  2. Kusatsu Now Resort Hotel
    • Rooms with private open-air bath
    • Reservable private bath

    Property's note: Guests with tattoos are not permitted to use the public baths or swimming pool. Private baths (for a fee) are available. Tattoos are permitted if completely covered. Cover-up stickers were available for purchase.

    Acidic Spring · Chloride spring

    Sources & details
    • Tattoos OK if covered
    • Analysis report on file
    • Tattoo rule checked Oct 2026

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Metasilicic acid 528.3 mg/kg

    Source: in-room bath (travel.yahoo.co.jp) · private bath (travel.rakuten.co.jp) · tattoo rule (kusatsu-now.jp) · Checked May 31, 2026

  3. Libmax Resort Kusatsu Onsen
    • Rooms with private open-air bath

    Acidic Spring · Chloride spring · Free-flowing

    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)
    • Private bath checked Oct 2026

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 528.3 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  4. Sensuikan

    Sensuikan

    Kusatsu, Gunma

    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring · Free-flowing

    PRIncludes affiliate links
    View rates on Agoda
    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 183 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  5. Uribou Ryokan

    Uribou Ryokan

    Kusatsu, Gunma

    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    PRIncludes affiliate links
    View rates on Trip.com
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  6. Uribou Ryokan Nakatoori Urahou
    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  7. Kusatsu Onsen Hinoki Tei Bokusuii
    • Reservable private bath

    Acidic Spring · Chloride spring

    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Metasilicic acid 528.3 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  8. Kusatsu Onsen Pension Goroji
    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  9. Kusatsu Onsen Hotel Sakurai
    • Rooms with private open-air bath

    Acidic Spring · Chloride spring · Free-flowing

    PRIncludes affiliate links
    View rates on Trip.com
    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 528.3 mg/kg

    Source: in-room bath (hotel-sakurai.co.jp) · Checked May 31, 2026

  10. Kusatsu Onsen Itouyen Hotel Kusatsu
    • Reservable private bath

    Acidic Spring · Chloride spring

    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Metasilicic acid 528.3 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  11. Kusatsu Onsen Juninya Ryokan
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    PRIncludes affiliate links
    View rates on Trip.com
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  12. Kusatsu Onsen Sen

    Kusatsu Onsen Sen

    Kusatsu, Gunma

    • Reservable private bath

    Acidic Spring · Chloride spring · Free-flowing

    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 528.3 mg/kg

    Source: private bath (travel.rakuten.co.jp) · Checked May 30, 2026

  13. Kusatsu Onsen Yubatake Sensuimizu
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  14. Kusatsu Onsen Yubatake Soan
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  15. Kusatsu Onsen Urakusatsu Tou
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type; Hypotonic Acidic high-temperature hot spring) / Metasilicic acid 234.1 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  16. Yuyado Tokinoniwa

    Yuyado Tokinoniwa

    Kusatsu, Gunma

    • Rooms with private open-air bath
    • Reservable private bath

    Acidic Spring · Chloride spring

    Sources & details
    • Analysis report on file

    Spring type: Acidic Aluminum Sulfate and Chloride Hot Spring / Metasilicic acid 165 mg/kg

    Source: in-room bath (ikyu.com) · private bath (dormy-hotels.com) · Checked May 31, 2026

  17. Yukawa Terrace

    Yukawa Terrace

    Kusatsu, Gunma

    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    PRIncludes affiliate links
    View rates on Trip.com
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  18. Kusatsu Onsen Maebashikan
    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    PRIncludes affiliate links
    View rates on Rakuten Travel
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: private bath (travel.rakuten.co.jp)

  19. Kusatsu Onsen Ichii

    Kusatsu Onsen Ichii

    Kusatsu, Gunma

    Acidic Spring · Chloride spring · Free-flowing

    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 528.3 mg/kg

  20. Tajimaya Ryokan

    Tajimaya Ryokan

    Kusatsu, Gunma

    Sulfur Spring · Acidic (pH under 3) · Chloride spring · Free-flowing

    PRIncludes affiliate links
    View rates on Agoda
    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 242.7 mg/kg

  21. Kamenoihoteru Kusatsurizoto

    Acidic Spring · Chloride spring · Free-flowing

    PRIncludes affiliate links
    View rates on Trip.com
    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 528.3 mg/kg

  22. Kusatsu Onsen Bouun

    Kusatsu Onsen Bouun

    Kusatsu, Gunma

    Acidic Spring · Chloride spring · Free-flowing

    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Aluminum Sulfate and Chloride Hot Spring / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 277.9 mg/kg

  23. Oyado Konoha

    Oyado Konoha

    Kusatsu, Gunma

    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    Sources & details
    • Analysis report on file

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring / Metasilicic acid 225 mg/kg

    Source: private bath (dormy-hotels.com) · Checked May 30, 2026

  24. Kusatsu no Oyado Kiyoshigukan
    • Reservable private bath

    No onsen analysis report on file yet

    Sources & details
    • Private bath checked Oct 2026

    Source: private bath (travel.rakuten.co.jp)

  25. Kusatsu Onsen Yuyado Iwafuji
    • Rooms with private open-air bath

    No onsen analysis report on file yet

    PRIncludes affiliate links
    View rates on Trip.com
    Sources & details
    • Private bath checked Oct 2026

    Source: in-room bath (travel.rakuten.co.jp)

  26. Kusatsu Kan

    Kusatsu Kan

    Kusatsu, Gunma

    Sulfur Spring · Acidic (pH under 3) · Chloride spring · Free-flowing

    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type; Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 240.6 mg/kg

Sorted using onsen analysis reports and what each property states on its own or booking-site page.

How we know

A stay is listed when we have its onsen analysis report on file, or when we checked its private open-air baths, reservable private baths or tattoo rules against its official website or booking-site page. Stays with neither are left out. Filter by water, or go to the lists by how you bathe (private baths, tattoo-friendly, mixed bathing).

  • This list includes stays whose onsen analysis report we have on file, and stays whose facility details we checked against a source. Stays with neither are left out.
  • Private bath and tattoo information comes from each property's official website or other published information. Every item links to its source and shows the date we last checked it. Items we could not source are left out.
  • Spring type, pH and how the water is used come from the onsen analysis report that Japanese law requires each facility to post, and from the facility's water-usage notice. They are shown only for stays whose report we have on file.
  • Details can change after we check them. Please confirm with the property before you book, especially tattoo rules and private bath fees.
  • Booking buttons are affiliate links. They do not affect which stays are listed.
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