Shidotaira Onsen (Kiku-no-yu)
Analysis UnverifiedShidotaira Onsen, one of the Hanamaki hot spring villages, has long served as a bathing retreat along the clear Toyosawa River. Kiku-no-yu is pumped from a drilled well, delivering 72.7°C water at a vigorous 368 liters per minute. Combining the gentleness of sulfate with the lasting warmth of chloride, it carries a faint hint of hydrogen sulfide and fine bubbles. Its warmth lingers long after bathing—a companion for those who want to soak slowly to the sound of the river.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A trace component with gentle antibacterial and anti-inflammatory action.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
▸Note
The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.
The source emerges at 72.7°C, so check each tub's temperature before entering. Chloride water warms you quickly; in hotter tubs, take several shorter soaks and rehydrate afterward.
With 397 mg/kg of sulfate and 207 mg/kg of chloride, this water blends the gentleness of a sulfate spring with the restorative warmth of a chloride spring. A slow soak may help relieve pain in stiff muscles and joints, and the warmth tends to linger after bathing.
Because the source is very hot, avoid long soaks in hotter tubs and watch for dizziness. Do not bathe when unwell or after drinking, and hydrate before and after bathing.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Shidotaira Onsen (Kiku-no-yu)
- Spring type
- Sodium Sulfate and Chloride Spring
- Source temperature
- 72.7℃
- pH
- 7.9
- Flow rate
- 368 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2025-06-19
- Analyst organization
- 株式会社大東環境科学
- Registration No.
- 岩手県第4号
Cations
- Hydrogen ion H⁺
- < 0.1 mg/kg
- Lithium ion Li⁺
- 0.50 mg/kg
- Sodium ion Na⁺
- 264 mg/kg
- Potassium ion K⁺
- 12.9 mg/kg
- Magnesium ion Mg²⁺
- 0.20 mg/kg
- Calcium ion Ca²⁺
- 49.3 mg/kg
- Strontium ion Sr²⁺
- 0.60 mg/kg
- Total cations
- 0.33 mg/kg
Anions
- Fluoride ion F⁻
- 6.2 mg/kg
- Chloride ion Cl⁻
- 207 mg/kg
- Hydrogen sulfide ion HS⁻
- < 0.1 mg/kg
- Thiosulfate ion S₂O₃²⁻
- < 0.1 mg/kg
- Sulfate ion SO₄²⁻
- 397 mg/kg
- Bicarbonate ion HCO₃⁻
- 45.8 mg/kg
- Bromide ion Br⁻
- 0.40 mg/kg
- Iodide ion I⁻
- < 0.1 mg/kg
- Total anions
- 0.66 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 0.50 mg/kg
- Metasilicic acid H₂SiO₃
- 125 mg/kg
- Metaboric acid HBO₂
- 15.5 mg/kg
- Total undissociated
- 0.14 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 4.4 mg/kg
- Free hydrogen sulfide H₂S
- < 0.1 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 1.1 mg/kg
- Component total
- 1.1 mg/kg
- Evaporation residue
- 1.1 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, Chronic pain or stiffness in muscles and joints, Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Bleeding disorders, Severe anemia, Any actively progressing illness, Pregnancy (especially early and late stages)
Drinking
- Drinkability
- Not drinkable
