KUROSHIO

エキチカ温泉 くろしおエキチカおんせん くろしお

Other
Chubu·Shizuoka

Day Use

Yes

Bathing & Water

SaunaYes

Dry heat sauna room

OnsenYes

Uses natural hot spring water

焼津港1号井

Yaizu Port Well No. 1

Operated by · 東海ガス株式会社

Sampled at wellhead
Chloride
Classification

Sodium-Calcium Chloride spring

A sodium-calcium chloride spring so concentrated it exceeds ocean salinity, with 16,270 mg/kg of dissolved solids that leave a thick mineral coating on the skin. It surfaces at a scalding 52.4 °C, placing it among Japan's hottest natural sources, and its alkaline pH 8.6 adds a slippery feel. The water is almost colorless and transparent yet strongly briny, and the certificate notes accompanying gas (mainly methane) rising with it.

pH
8.60
Alkaline
Source temperature
52.4°C
Hot
Tonicity
16.27g/kg
Hypertonic
Flow rate
604L/min
High
Free H₂S
0.01mg/kg
Low
Color
almost colorless and transparent, strongly briny, with accompanying gas (mainly methane) emerging
Taste
strongly briny
Highlights
  • Strong salt
  • Top-decile hot

Analyzed Jan 14, 2021·一般社団法人 長野県薬剤師会·Cert no. 中No. 2-29号

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SM
Sergey M
1 year ago

276. Kuroshio, Yaizu Super sento with onsen water for 750. Listed hours 10:00–09:00 (nearly 24 hours). Located near the station. They stamp the 60 Onsen of Shizuoka 24/25 booklet. Has a good restaurant, tasty ice cream, various chill zones, a library (including an onsen magazine), massage, and a shop. The interior looks stylish and very pleasant. Online photos match. All baths are indoors: 1. Foam bath with clear water, temperature 40. Bubbles come up through the entire surface as if through the concrete. 2. Central rectangular bath, clear water, temperature 43. 3. Additional bath with bubbles, clear water, temperature 40. 4. Radon sauna with automatic water pouring. 5. Very cold bath. No rotenburo, but convenient location, a rare foam bath, stylish interior outside the bath area — recommended to visit.