Kusatsu Onsen

草津温泉
Info pending

Gunma Kusatsu, Agatsuma District

群馬県 吾妻郡草津町

AT A GLANCE

Kusatsu Onsen is an acidic spring, chloride spring, and sulfate spring (pH 2.0, acidic). Contains ≥50 mg/kg of metasilicic acid, certified as a beauty spring. Per Japan's Ministry of the Environment guidelines, indicated for atopic dermatitis and psoriasis.

SOURCES
♨Nishinokawara Gensen (Cho-yu)
西ノ河原源泉（町有）
Acidic aluminum sulfate chloride spring (Hypotonic acidic high-temperature spring)
酸
Acidic Spring
塩
Chloride Spring
硫塩
Sulphate SpringpH 2.0453.7℃Natural sp…
See effects, components & details
♨Bandaiko
万代鉱
Acidic hydrogen sulfate chloride spring (hypotonic acidic high-temperature spring)
酸
Acidic Spring
塩
Chloride Spring
硫塩
Sulphate SpringpH 1.7594.6℃Self-flowi…
See effects, components & details

If a source spring listed for this facility looks incorrect, please contact us.

How Long to Stay (Toji)
Start with 2 nights / 3 days

Japan’s Ministry of the Environment notes that even a short stay refreshes you. For a full therapeutic cure, around 2–3 weeks is the guideline.

More on toji length
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This spring’s analysis values in one image—save it and post it to your feed or story.

Sample caption

Kusatsu Onsen (Kusatsu, Agatsuma District) Acidic Spring / Chloride Spring / pH 2.04 / 53.7℃ #onsen #kusatsu #acidicspring https://onsen-analysis.com/en/onsen/kusatsu-5?utm_source=card&utm_medium=social&utm_campaign=onsen_card

USAGE
HeatedNo
DilutedYes
RecycledNo
FilteredNo
DisinfectedNo
AdditivesNo
Diluted: Water dilution for temperature adjustment. As the source spring temperature is extremely high at 94.5-96°C, water dilution is performed to lower the temperature to levels suitable for drinking. While some facilities specify "no water dilution or heating" on official websites, water dilution is typically included during heat exchange in the distribution system.
▸Note

The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.

Famous Onsen Area
Kusatsu Onsen — overview, spring types, and access
酸性泉

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Acidic Spring — benefits, bathing tips, and onsen-hopping order
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✨ The descriptions, catch phrases, and translations on this page are generated by AI (Claude). pH, temperature, and component values are OCR-extracted from the official analysis report. Learn more