Onsen OniOnsen Oni

Yuasa Castle Onsen Hotel

湯浅温泉 湯浅城ゆあさおんせん ゆあさじょう

Lodging
Kansai·Wakayama
0737-63-6688yuasajyo.jp

Day Use

Yes
¥600

Bathing & Water

Outdoor BathNo

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

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

Policies & Services

TattooNo

Allows entry with visible tattoos

KidsYes

Welcomes children and families

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels available to rent or borrow

Rest AreaYes

Relaxation space for after bathing

ParkingYes

On-site or nearby parking available

Water treatment

from Article 18 disclosure
  • Added water
    Yes
  • Reheated
    Yes
  • Recirculated
    Yes
  • Disinfected
    Yes
    塩素系薬剤
  • Bath additives
    Not disclosed

湯浅温泉

Yuasa Onsen

Operated by · 株式会社クレイシア

Sampled at wellhead
湯
Simple
Classification

Sodium Bicarbonate spring

A weakly alkaline cold-mineral spring (21.7 C source, pH 8.8) with a faint hydrogen sulfide note at the wellhead. Total dissolved solids sit just below 1 g/kg, so the certificate does not classify it as a therapeutic spring, but the alkaline chemistry still gives the water the soft, slippery hand of the classic Japanese beauty-water family. Because the source is below 25 C the bath is reheated, and it is also diluted, recirculated and chlorine-disinfected before reaching the tub.

pH
8.80
Alkaline
Source temperature
21.7°C
Cold mineral
Tonicity
0.99g/kg
Hypotonic
Flow rate
215L/min
Typical
Free CO₂
1.30mg/kg
Low
Color
colorless and clear
Taste
very faintly mineral
Odor
weak hydrogen sulfide
Highlights
  • Cold mineral

Analyzed Aug 18, 2022·和歌山県環境衛生研究センター·Cert no. 温泉第1105号

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SM
Sergey M
3 months ago

503. Yuasa Castle Onsen Hotel, Yuasa, Wakayama ★ Hotel with an onsen located inside a castle building. Visited for higaeri for 600. Higaeri hours are 12:00-23:00. They stamp the Wakayama 88 Onsen book. There is a gender rotation for baths. Photos of baths from the internet match. 1. First bath set by gender. Stuffy inside; for comfort it's better to sit near the window. 1.1. Bath with clear water, has a bubble zone. Temperature around 41.5. 1.2. Sauna. 1.3. Barrel with cold water. 2. Second bath set by gender. Bath with clear water. Temperature around 42. Breathing inside is fine. Very unusual design for an onsen - definitely worth checking out. 11.04.2025 02.11.2025 12.11.2025