Kumihama Onsen (Kouon Gensen)
Analysis VerifiedThe Kumihama Onsen (Kouon Gensen) source emerges in the Kumihama Bay area, facing the Sea of Japan in northern Kyoto Prefecture. Drilled in 1992 from a depth of 1,500 meters, this source has since supplied local facilities like the "Kumihama Onsen Yumoto-kan." Its clear, colorless, and mild water is appealing to all. Loved as a spring that soothes travel fatigue in a scenic location overlooking a beautiful ria coast.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
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.
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 water is hot at 51.2°C, so start by acclimating your body with "kake-yu" (scooping and pouring hot water on yourself). As a chloride spring, it retains heat well and prevents chills, but prolonged bathing can be strenuous. It's best to take breaks and limit each dip to about 10 minutes.
With a weakly alkaline pH of 8.02, the water feels soft and gentle on the skin. The main component, chloride ions (2278 mg/kg), forms a thin veil on the skin, preventing moisture loss after bathing and leaving it feeling hydrated. The abundant calcium ions (889.1 mg/kg) are known for their calming effects, making it perfect for days when you want to relax both mind and body.
Please avoid bathing during active stages of illness, when feeling weak, or if you have severe heart or lung conditions. Move slowly when getting out of the bath to prevent dizziness from standing up too quickly.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- 久美浜温泉（高温源泉）
- Spring type
- カルシウム・ナトリウム－塩化物泉
- Source temperature
- 51.2℃
- pH
- 8.08
- Flow rate
- 653 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2017-07-03
- Analyst organization
- 一般社団法人京都微生物研究所
- Registration No.
- 京都府第2号
Cations
- Sodium ion Na⁺
- 808 mg/kg
- Potassium ion K⁺
- 12.0 mg/kg
- Magnesium ion Mg²⁺
- 0.90 mg/kg
- Calcium ion Ca²⁺
- 889 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 0.00 mg/kg
- Iron(II) ion Fe²⁺
- 0.00 mg/kg
- Iron(III) ion Fe³⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 6.5 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 1.7 mg/kg
Anions
- Fluoride ion F⁻
- 3.3 mg/kg
- Chloride ion Cl⁻
- 2278 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 691 mg/kg
- Bicarbonate ion HCO₃⁻
- 11.0 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 10.1 mg/kg
- Iodide ion I⁻
- 0.00 mg/kg
- Hydrogen metasilicate HSiO₃⁻
- 0.00 mg/kg
- Metaborate ion BO₂⁻
- 0.00 mg/kg
- Total anions
- 3.0 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 0.10 mg/kg
- Metasilicic acid H₂SiO₃
- 39.1 mg/kg
- Metaboric acid HBO₂
- 2.4 mg/kg
- Total undissociated
- 0.04 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
- 4.8 mg/kg
- Component total
- 4.8 mg/kg
- Evaporation residue
- 7.0 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Chronic pain or stiffness in muscles and joints (rheumatoid arthritis, osteoarthritis, lower back pain, neuralgia, frozen shoulder, chronic phase of bruises and sprains), muscle stiffness due to motor paralysis, poor circulation, gastrointestinal dysfunction (stomach heaviness, intestinal gas), high blood pressure (mild), impaired glucose tolerance (diabetes), dyslipidemia (mild), mild asthma or emphysema, hemorrhoid pain, autonomic instability, stress-related symptoms (insomnia, depression), post-illness recovery, fatigue recovery, health promotion, cuts and grazes, xeroderma
- Contraindications
- Active phases of illness (especially with fever), active tuberculosis, advanced malignant tumors or severe anemia with significant physical weakness, severe heart or lung disease causing shortness of breath with slight movement, severe kidney disease with swelling, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic illness
Drinking
- Drinkability
- Not drinkable
