1-go Otsusen
Analysis VerifiedNoboribetsu Onsen, one of Hokkaido's most celebrated thermal destinations with over a century of heritage, draws international visitors through its generous flows from the Jigokudani (Hell Valley) source. This milky-white, sulfur-scented waters—naturally gushing at 2,720 liters per minute—particularly suit those seeking relief from daily fatigue and stubborn skin troubles, as well as travelers eager to experience nature's raw mineral power.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.
The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.
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.
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.
Given its formidable acidity (pH 2.26), prolonged soaking can irritate sensitive skin. First-time bathers should limit immersion to 5–10 minutes, followed by a gentle freshwater rinse to buffer dermal stress. Avoid submerging your face to prevent mucosal discomfort from this potent acidic mineral water.
This intensely acidic sulfur spring (pH 2.26, 58.6°C) carries sulfate ions at 441.3 mg/kg and aluminum at 26.0 mg/kg, wielding remarkable antimicrobial power. It excels for chronic skin conditions and psoriasis sufferers, as the hydrogen sulfide compounds simultaneously deliver skin-beautifying and antibacterial benefits. Noboribetsu's abundant 2,720-liter-per-minute natural outflow ensures you experience the freshest, most vibrant source water.
Due to extreme acidity, skin and mucous membranes face considerable irritation. Those with cardiac disease, hypertension, serious illness, or pregnancy must consult a physician before bathing. Avoid immersion during acute phases of wounds or eczema.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- 1号乙泉
- Spring type
- 酸性含硫黄アルミニウム硫酸塩塩化物温泉（硫化水素型）
- Old spring type name
- 酸性含硫黄-アルミニウム-硫酸塩・塩化物温泉（硫化水素型）
- Source temperature
- 58.6℃
- pH
- 2.26
- Flow rate
- 2,720 L/min
- Flow type
- 自然湧出
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2009-07-27
- Analyst organization
- 北海道立衛生研究所
- Registration No.
- 北海道立衛生研究所
Cations
- Hydrogen ion H⁺
- 5.0 mg/kg
- Sodium ion Na⁺
- 59.3 mg/kg
- Potassium ion K⁺
- 8.2 mg/kg
- Ammonium ion NH₄⁺
- 2.5 mg/kg
- Magnesium ion Mg²⁺
- 9.7 mg/kg
- Calcium ion Ca²⁺
- 20.1 mg/kg
- Aluminum ion Al³⁺
- 26.0 mg/kg
- Manganese ion Mn²⁺
- 1.5 mg/kg
- Iron(II) ion Fe²⁺
- 17.3 mg/kg
- Iron(III) ion Fe³⁺
- 1.5 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 0.15 mg/kg
Anions
- Fluoride ion F⁻
- 0.10 mg/kg
- Chloride ion Cl⁻
- 106 mg/kg
- Hydroxide ion OH⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 16.4 mg/kg
- Sulfate ion SO₄²⁻
- 441 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Hydrogen sulfate HSO₄⁻
- 93.8 mg/kg
- Total anions
- 0.66 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 1.5 mg/kg
- Arsenious acid HAsO₂
- 0.20 mg/kg
- Metasilicic acid H₂SiO₃
- 188 mg/kg
- Metaboric acid HBO₂
- 25.4 mg/kg
- Total undissociated
- 0.22 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 28.0 mg/kg
- Free hydrogen sulfide H₂S
- 12.4 mg/kg
- Total dissolved gas
- 0.04 mg/kg
Trace Components
- Radon Rn
- 0.075 mE/kg
Totals
- Total dissolved substances
- 1.0 mg/kg
- Component total
- 1.1 mg/kg
- Evaporation residue
- 1.2 mg/kg
Usage
- Heating
- No
- Dilution
- Yes
- Recycle / Filter
- Recycled
- Additives
- No
- Disinfection
- Yes
Drinking
- Drinkability
- Not drinkable
