Kameiso

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

Water treatment

Pure source-flow

from Article 18 disclosure

Added water
No
Reheated
No
Recirculated
No
Disinfected
No
Bath additives
No

湯浦温泉

Yunoura Onsen

Operated by · 旅館亀井荘

Sampled at wellhead

湯

Simple

Classification

Sodium Chloride-Bicarbonate spring

A gentle simple thermal spring of Yunoura Onsen, emerging at 39.3 °C. Weakly alkaline and hypotonic, it sits well within the soft, easy-on-the-skin family of Japanese simple springs. Total dissolved solids are light at 494 mg/kg, and the wellhead carries a faintly sweet taste with a soft hydrocarbon note — an unobtrusive, settled water rather than an assertive one.

Source temperature

39.3°C

Warm

Tonicity

0.49g/kg

Hypotonic

Flow rate

120L/min

Typical

Radon

5.51Bq/kg

Low