Kitamura Onsen No.4 and No.5 Wells Mixed
Analysis UnverifiedThe Kitamura Onsen source dates back to 1983, when drilling for winter heating at an agricultural facility site struck hot water at a depth of 893 m, surprising a Sorachi region long thought unable to yield springs above 25°C. Today the No.4 and No.5 wells, drilled in 1996 and 1997, are blended. This dense, intensely salty water wraps the skin and lets warmth linger long after bathing, ideal for chilly days.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").
Absorbed through the skin to gently calm nervous tension, leaving deep relaxation after the bath.
Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.
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.
With 29.15 g/kg of minerals this strong-salt water is potent, so limit soaks to about 10 minutes with breaks. At around 43°C it runs slightly hot; pour water over yourself first and rehydrate afterward.
Holding 17,520 mg/kg of chloride, this hypertonic water leaves a fine salt film that helps retain heat, offering restorative warmth on cold days. It is traditionally associated with helping relieve pain from stiff shoulders and lower backs.
This concentrated strong-salt water can cause bathing fatigue if you soak too long. Keep baths short if you have heart or blood pressure concerns, and rinse off if your skin is sensitive.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Kitamura Onsen No.4 and No.5 Wells Mixed
- Spring type
- Sodium-Calcium Chloride strong saline Hot Spring
- Source temperature
- 43.2℃
- pH
- 7.5
- Osmotic pressure
- 高張性
Analysis Document
- Analysis date
- 2025-05-30
- Analyst organization
- 株式会社環境総合科学
- Registration No.
- 北海道第4号
Cations
- Sodium ion Na⁺
- 8880 mg/kg
- Potassium ion K⁺
- 271 mg/kg
- Ammonium ion NH₄⁺
- 28.0 mg/kg
- Magnesium ion Mg²⁺
- 18.1 mg/kg
- Calcium ion Ca²⁺
- 2027 mg/kg
- Aluminum ion Al³⁺
- not detected
- Manganese ion Mn²⁺
- 0.03 mg/kg
- Iron(II) ion Fe²⁺
- 0.01 mg/kg
- Zinc ion Zn²⁺
- 0.00 mg/kg
- Lead ion Pb²⁺
- not detected
- Copper ion Cu²⁺
- not detected
- Cadmium ion Cd²⁺
- not detected
- Total cations
- 11.2 mg/kg
Anions
- Fluoride ion F⁻
- not detected
- Chloride ion Cl⁻
- 17520 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 0.00 mg/kg
- Bicarbonate ion HCO₃⁻
- 122 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 61.0 mg/kg
- Iodide ion I⁻
- 8.9 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.05 mg/kg
- Total anions
- 17.7 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 112 mg/kg
- Metaboric acid HBO₂
- 101 mg/kg
- Total undissociated
- 0.21 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 29.1 mg/kg
- Component total
- 29.1 mg/kg
- Evaporation residue
- 31.1 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
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
