Onsen OniOnsen Oni

Shikimatsuri

四季まつりしきまつり

Other
Kansai·Osaka
072-479-2641shikimatsuri.jp

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

Water treatment

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

松葉温泉

Matsuba Onsen
Sampled at wellhead
ラ
Radon
Classification

Sodium Chloride-Bicarbonate spring

A radon-bearing weak radioactive spring. Weakly alkaline at pH 8.4 and only lightly mineralized at 729 mg/kg, so the water itself feels gentle on the skin. The radon load of 236.8 Bq/kg (17.6 Mache) is what makes the source distinctive — well into the 'hormesis' tradition of radon bathing. Heated, recirculated and chlorine-disinfected before reaching the bath.

Source temperature
26.8°C
Low temp.
Tonicity
0.73g/kg
Hypotonic
Flow rate
83.3L/min
Typical
Radon
237Bq/kg
High
Color
colorless
Taste
tasteless
Odor
odorless
Highlights
  • High radon

Analyzed Oct 11, 2019·株式会社ケイ・エス分析センター

Programs

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SM
Sergey M
4 months ago

637. Shikimatsuri, Kishiwada, Osaka Visited for day use at 750 yen. Day use available from 09:00 to 21:00. They stamp the 88 Onsen of Wakayama stamp book. Bath photos from the internet match. Outdoor bath. Could have been a very cool view (there's even an infinity-style slope), but an opaque fence ruins everything and there's practically no view. Clear water. There's a smell similar to "bromine." Temperature 40. Indoor bath with clear water, temperature 41. Breathing inside is good. There's a staircase to the floor above leading to a lookout. The onsen is inconvenient to get to and the opaque fence really ruins the bath. Not worth a special day trip. 03.11.2025