横湯第一ボーリング、横湯第二ボーリング、熱の湯の混合泉
Yokoyu No.1 Boring, Yokoyu No.2 Boring & Netsu-no-yu BlendMixed source
Sampled at bath inlet
塩
Chloride
+ Sulfate
Classification
Sodium-Calcium Chloride-Sulfate spring
A sodium-calcium chloride-sulfate spring, weakly alkaline and soft on the skin. The wellhead runs at 86.5 °C, putting it among Japan's hottest natural sources (cooled before bathing). The water is almost colorless and clear, slightly salty with a faint sulfur note, and moderately mineralized at 1,611 mg/kg of dissolved solids for noticeable body.
pH
8.00
Weakly alkaline
Source temperature
86.5°C
Hot
Tonicity
1.61g/kg
Hypotonic
Free CO₂
2.30mg/kg
Low
Free H₂S
0.10mg/kg
Low
- Color
- colorless and clear
- Taste
- slightly salty with a faint sulfur note
Highlights
- Top-decile hot
Analyzed May 26, 2016·一般社団法人 上田薬剤師会 検査センター·Cert no. 中28-2(No.427)