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KUROSHIO

エキチカ温泉 くろしおエキチカおんせん くろしお

Bathing Complex
Chubu·Shizuoka

Day Use

Yes
10:00–09:00
¥750

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathNo

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Sauna room of any kind

Cold BathYes

Cold water plunge bath, typically used after sauna

Policies & Services

WashingYes

Shower, wash stations, soap and shampoo provided

焼津港1号井

Yaizu Port Well No. 1

Operated by · 東海ガス株式会社

塩
Chloride
Color
almost colorless and transparent, strongly briny, with accompanying gas (mainly methane) emerging
Taste
strongly briny
Odor
not recorded

Sodium-Calcium Chloride spring

pH 8.6AlkalineHot source · 52°CStrong salt
Composition fingerprint16.3 g/kg dissolved · Hypertonic
Na⁺53
Ca²⁺46
Cl⁻100
◀ 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-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.

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

Explore the water

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1 review

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Sergey M
1 year ago· edited

276. Kuroshio, Yaizu ★ A super sento with onsen water for 750. The opening hours are listed as 10:00 to 09:00, almost around the clock. It is near the station. They stamp the Shizuoka 60 Onsen 24/25 stamp rally. There is a good diner, tasty ice cream, different chill-out areas, a library, including an onsen magazine, massage, and a shop. The facility itself looks stylish and very pleasant inside. The bath photos are from the internet, and they match. The baths are indoor only: 1. A bubble bath with clear water, temperature 40. The bubbles come up from the whole surface of the bath, as if through concrete. 2. A central rectangular bath, clear water, temperature 43. 3. An extra bubble bath, clear water, temperature 40. 4. A radon sauna with automatic sprinkling. 5. A very cold bath. There is no rotenburo, but the convenient location, the rare bubble bath, and the stylish interior outside the bath area are worth keeping in mind. 12.11.2024

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Last updated October 13, 2026