Umegashima Onsen Mixed Source
Analysis UnverifiedKnown for some 1,700 years and said to be one of Takeda Shingen's hidden baths, Umegashima is a mountain toji village at the head of the Abe River. The city manages the spring and distributes it to the inns. Clear yet scattered with white yunohana, its pH 9.4 alkaline water feels silky and slippery, long praised as a "bath that makes beauties" and ideal for slow, lukewarm soaks.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
- Sulfur10.8 mg/kg
- Feel
- Smells like boiled eggs; the water may turn milky white or blue-green.
- Said to
- Said to be strongly antibacterial and to promote circulation. Bathing indications include atopic dermatitis and chronic eczema.
- Note
- With sensitive skin, rinse with fresh water after bathing. Remove silver jewelry—it tarnishes.
- Alkaline (pH)pH 9.4
- Feel
- Feels slippery and silky on the skin.
- Said to
- Said to remove old skin cells and excess sebum.
- Note
- Skin can dry out afterwards—moisturize after bathing.
- Metasilicic acid65.4 mg/kg
- Feel
- Your skin may feel smoother.
- Said to
- 50 mg/kg or more is said to mark a “skin-beautifying spring”; it is also used in skincare.
- Note
- The “skin-beautifying” label is a common rule of thumb, not a legal standard.
Effects are general descriptions based on the Ministry of the Environment’s indications by spring type, not a guarantee.
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.
At 38.6°C the unheated water is lukewarm, so enjoy long, slow soaks and alternate with a warmer tub in winter. The alkaline water removes skin oils, so moisturize afterward, and remove silver jewelry, which sulfur can tarnish.
With pH 9.4 alkalinity and 133.3 mg/kg of bicarbonate ion softening old skin cells, the water may leave silky skin. Its 8.9 mg/kg of hydrosulfide ion and near-body-temperature warmth invite deep relaxation.
As the water contains sulfur, mind ventilation and leave the bath if you feel unwell. Those prone to dry skin should moisturize after bathing in this alkaline water.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Umegashima Onsen Mixed Source
- Spring type
- Simple Sulfur Hot Spring
- Source temperature
- 38.6℃
- pH
- 9.4
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2019-09-17
- Analyst organization
- 一般財団法人静岡県生活科学検査センター
- Registration No.
- 静岡県第1号
Cations
- Sodium ion Na⁺
- 69.8 mg/kg
- Potassium ion K⁺
- 1.0 mg/kg
- Magnesium ion Mg²⁺
- 0.09 mg/kg
- Calcium ion Ca²⁺
- 2.4 mg/kg
- Aluminum ion Al³⁺
- < 0.05 mg/kg
- Manganese ion Mn²⁺
- < 0.05 mg/kg
- Iron(II) ion Fe²⁺
- 0.07 mg/kg
- Iron(III) ion Fe³⁺
- < 0.05 mg/kg
- Copper ion Cu²⁺
- < 0.05 mg/kg
- Total cations
- 73.2 mg/kg
Anions
- Chloride ion Cl⁻
- 1.4 mg/kg
- Hydroxide ion OH⁻
- 0.40 mg/kg
- Hydrogen sulfide ion HS⁻
- 8.9 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 3.8 mg/kg
- Sulfate ion SO₄²⁻
- 14.4 mg/kg
- Bicarbonate ion HCO₃⁻
- 133 mg/kg
- Carbonate ion CO₃²⁻
- 9.6 mg/kg
- Bromide ion Br⁻
- < 0.05 mg/kg
- Iodide ion I⁻
- 0.20 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.10 mg/kg
- Metaborate ion BO₂⁻
- 3.1 mg/kg
- Total anions
- 175 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 65.4 mg/kg
- Total undissociated
- 65.4 mg/kg
Dissolved Gas
- Free hydrogen sulfide H₂S
- < 0.1 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 314 mg/kg
- Component total
- 314 mg/kg
- Evaporation residue
- 234 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, Chronic eczema, Epidermal suppuration, Autonomic instability, Insomnia, Depression
- General indications
- High blood pressure (mild), Rheumatoid arthritis, 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), Severe chronic dermatitis (sulphur springs)
Drinking
- Drinkability
- Not drinkable
