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Kasuitei Ooya

花水庭おおやはなみずにわおおや

Lodging
Chubu·Yamanashi

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Dry heat sauna room

Capabilities

Private BathYes

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

Policies & Services

KidsYes

Welcomes children and families

DiningYes

Restaurant or dining open to visitors (not just hotel meal plans)

WashingYes

Shower, wash stations, soap and shampoo provided

Rest AreaYes

Relaxation space for after bathing

ParkingYes

On-site or nearby parking available

Water treatment

Treated and recirculated
from Article 18 disclosure
  • Added water
    Yes
  • Reheated
    Yes
  • Recirculated
    Yes
  • Disinfected
    Yes
    塩素系薬剤
  • Bath additives
    No

富士河口湖町第2号源泉

Fujikawaguchiko No. 2 Spring

Operated by · 花水庭おおや

Sulfate
+ Chloride
Color
colorless and transparent
Taste
tasteless
Odor
odorless

Sodium Chloride spring

pH 7.1Neutral
Composition fingerprint1.8 g/kg dissolved · Hypotonic
Na⁺43
Cl⁻39
CationsAnions
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Chloride Cl⁻
table-salt anion — coats the skin and holds heat in.
Known good for
  • Aches & jointsstiff shoulders
  • Circulationtired legs
  • Warmingcold sensitivity

A calcium-sodium led sulfate-chloride spring drawn cold at 27 °C and reheated for bathing. Neutral pH with 1,843 mg/kg dissolved solids — sulfate gives quiet body while chloride layers in heat retention. At the wellhead the water is colorless, tasteless, and odorless; the temperature and warmth come from on-site heating rather than the source itself.

Sampled at wellhead·Analyzed Jul 18, 2019·一般社団法人 山梨県食品衛生協会·Cert no. 梨食第令1-4-19号

Explore the water

Views

Lake

Highlights

Utaseyu
Jet Bath

About

Kasuitei Ooya (花水庭おおや) sits on the shore of Lake Kawaguchi, a ryokan that has been here since the Taisho era (founded 1923). The shared baths draw from the Fujikawaguchiko natural spring. There are two separate bath areas: the basement-floor baths offer spacious indoor pools and open-air tubs with a waterfall shower, plus a sauna; the top-floor baths are the view baths, with open-air tubs looking directly over the lake. A private reserved bath, Ukifune (浮舟), is also on the top floor and can be booked by the session. In-room baths, where they exist, use Mt Fuji water rather than the spring.

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Reserve or check availability on a booking site.

SM
Sergey M
2 years ago

160. Kasuitei Ooya, Kawaguchiko Stayed here twice overnight. But it so happened that I didn't visit the 7th floor bath either time, so this review is without that (it should be good). The hotel is walkable from the station without much effort, located by the lake. One time I took a room with an in-room bath overlooking Lake Kawaguchiko. The bath is comfortable for one person, windows open (not fully) toward the lake and toward the room's balcony. Good for Witcher cosplay. Breathing in summer is comfortable. Water is clear, odorless. Temperature hot. That time I took the meals - everything was very good. One of the shared bath areas is on the basement floor. It has indoor and outdoor baths, a cold water bath, sauna, and a shallow round bath with mild temperature for rinsing. Indoor bath with clear water, temperature hot, no particular smell. Breathing on a summer evening is comfortable. Even though it's a basement floor, there's an outdoor bath. Water is clear, temperature hot-. No particular smell either. There are two utaseyu (falling water baths). Based on photos and info in the hotel, there are also rooms with different in-room baths and there should be private baths on the 7th floor (where another shared bath is). A solid ryokan and recommended, but at Lake Kawaguchiko the issue is that you get views of the lake but no views of Mt. Fuji.

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Last updated June 23, 2026