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Yumeminooka

湯めみの丘ゆめみのおか

Public Bathhouse
Chubu·Yamanashi

Day Use

Yes
10:00–22:00
¥500

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

Cold BathYes

Cold water plunge bath, typically used after sauna

Policies & Services

WashingYes

Shower, wash stations, soap and shampoo provided

湯めみの丘

Yumeminooka

Operated by · 株式会社 住吉鉄工

Chloride
Color
colorless and transparent
Taste
not recorded
Odor
faint hydrogen sulfide

Sodium Chloride spring

Hot source · 43°C
Composition fingerprint1.2 g/kg dissolved · Hypotonic
Na⁺86
Cl⁻95
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
  • Warmingcold sensitivity
  • Aches & jointsstiff shoulders
  • Smooth skindry, rough skin

A sodium chloride spring rising in the Kofu basin at 43 degrees Celsius. The water is weakly alkaline and soft on the skin, salty enough to leave noticeable warmth long after the bath, and carries a faint hydrogen sulfide note at the wellhead. Total dissolved solids sit at 1,165 mg/kg — moderately mineralized, with chloride dominant and a quiet sulfur edge.

Sampled at wellhead·Analyzed Nov 1, 2022·環境未来株式会社 総合検査センター

Explore the water

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1 review

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Sergey M
1 year ago

535. Yumeminooka, Kai, Yamanashi ★★ Onsen for 500. Operating hours are listed as 10:00 to 22:00. They stamp the Yamanashi 100 Onsen book, but the stamp is badly worn. Bath photos are from the internet, roughly match — very few photos online, especially with Mt. Fuji (in reality, there's a spot in the rotenburo where you can see Fuji while sitting in the onsen). 1. Outdoor bath on a balcony. Direct view of Mt. Fuji — there are several spots in the bath itself where the mountain is visible while sitting in the water. Clear water, temperature around 40-41. 2. Indoor area. Breathing inside is fine, but near the shower drains there's an unpleasant smell. Some view of Mt. Fuji from the window. 2.1. Main bath with clear water, temperature around 40-41. 2.2. Small bath with a partition. Clear water, temperature around 42-43. 2.3. Bubble bath. Clear water, temperature around 38-39. 2.4. Small bath with clear water, temperature around 44. 2.5. Sauna. 2.6. Cold bath. 500 yen for an onsen with a rotenburo and a view of Mt. Fuji — that's a seriously powerful combo, hard to ignore. 11.05.2025

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Last updated July 3, 2026