Onsen OniOnsen Oni

Public Bath No.2 Sasa no yu

二番湯 笹の湯にばんゆ ささのゆ

Public Bathhouse
Yudanaka–Shibu Onsen-kyoAndai Onsen
Chubu·Nagano
0269-33-2921

Day Use

Yes

Bathing & Water

Outdoor BathNo

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaNo

Dry heat sauna room

Cold BathNo

Cold water plunge bath, typically used after sauna

OnsenYes

Uses natural hot spring water

Capabilities

Private BathNo

Private bath available for day-use visitors or hotel guests to reserve

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

笹の湯

Sasa-no-yu Spring
Sampled at wellhead
硫
Sulfate
+ Chloride
Classification

Sodium-Calcium Sulfate-Chloride spring

A hot sodium-calcium spring with a sulfate-led, chloride-layered composition (sulfate dominates the anion balance, chloride sits a close second). Weakly acidic at the wellhead (pH 4.3), the water carries a faint iron taste and a touch of bitterness. Sulfate gives the bath a settled, mineral-rich body, while a salty edge from chloride and 140 mg/kg of metasilicic acid round it out.

pH
4.30
Weakly acidic
Tonicity
1.15g/kg
Hypotonic
Free CO₂
51mg/kg
Low
Color
colorless and clear, with a faint iron taste
Taste
faintly iron-tinged with a bitter note

Analyzed Oct 30, 1998·長野県衛生公害研究所

Programs

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SM
Sergey M
2 years ago

Public Bath No.2 Sasa no yu, Shibu onsen 2nd onsen of Shibu. The water is cloudy, and the temperature was normal — maybe someone had already diluted it, or it's just always milder here. One of the many old-school standard Shibu baths.