Noboribetsu Onsen 5-gosen
Analysis VerifiedNoboribetsu Onsen, one of Hokkaido's premier hot spring destinations, has welcomed therapeutic bathers since antiquity. The geothermal fields flowing from Hell Valley (Jigoku-dani) feed this resort with abundant, mineral-rich waters across diverse spring types—drawing visitors from throughout Japan and beyond. Whether you seek respite from daily fatigue or a deep, immersive thermal cure in Hokkaido's pristine wilderness, Noboribetsu's legendary springs await.
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.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Absorbed through the skin to gently promote peripheral 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.
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 the extreme temperature of 94.9°C, immerse yourself only in temperature-adjusted waters provided by the facility. Chloride springs retain heat exceptionally well; limit each soak to 10–15 minutes to avoid thermal stress. After bathing, embrace the "post-bath glow"—allow the thin salt film clinging to your skin to dry naturally rather than rinsing away, prolonging the warmth and moisture that linger beautifully.
This isotonic chloride spring, with a neutral pH of 6.7 and 4,894 mg/L of chloride ions, strengthens the skin's barrier function and accelerates recovery from irritation and minor wounds. The concentrated mineral load—9.640 g/kg total dissolved solids—delivers profound warmth, making it especially effective for those battling chilled circulation and joint discomfort. The abundance of metasilicic acid (484.3 mg/L) bestows a silky-smooth tactile sensation that lingers on the skin.
The extreme heat poses cardiovascular strain; prolonged or consecutive bathing risks burdening the heart and blood pressure. Those with cardiac disease, hypertension, or active fever should abstain or limit immersion to brief periods.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- 登別温泉5号泉
- Spring type
- ナトリウム・カルシウム－塩化物温泉
- Source temperature
- 94.9℃
- pH
- 6.7
- Flow rate
- 51 L/min
- Flow type
- 自然湧出
- Osmotic pressure
- 等張性
Analysis Document
- Analysis date
- 2014-07-31
- Analyst organization
- 北海道立衛生研究所
- Registration No.
- 北海道第1号
Cations
- Sodium ion Na⁺
- 1870 mg/kg
- Potassium ion K⁺
- 168 mg/kg
- Ammonium ion NH₄⁺
- 2.0 mg/kg
- Magnesium ion Mg²⁺
- 101 mg/kg
- Calcium ion Ca²⁺
- 909 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 0.90 mg/kg
- Iron(II) ion Fe²⁺
- 1.0 mg/kg
- Iron(III) ion Fe³⁺
- 0.00 mg/kg
- Zinc ion Zn²⁺
- 0.00 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 0.00 mg/kg
- Barium ion Ba²⁺
- 0.00 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 3.1 mg/kg
Anions
- Fluoride ion F⁻
- 0.20 mg/kg
- Chloride ion Cl⁻
- 4894 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.10 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.20 mg/kg
- Sulfate ion SO₄²⁻
- 39.6 mg/kg
- Bicarbonate ion HCO₃⁻
- 156 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.10 mg/kg
- Total anions
- 5.1 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 3.5 mg/kg
- Metasilicic acid H₂SiO₃
- 484 mg/kg
- Metaboric acid HBO₂
- 386 mg/kg
- Total undissociated
- 0.87 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 625 mg/kg
- Free hydrogen sulfide H₂S
- 0.40 mg/kg
- Total dissolved gas
- 0.62 mg/kg
Totals
- Total dissolved substances
- 9.0 mg/kg
- Component total
- 9.6 mg/kg
- Evaporation residue
- 8.8 mg/kg
Usage
- Heating
- No
- Dilution
- Yes
- Recycle / Filter
- Recycled
- Additives
- No
- Disinfection
- Yes
Drinking
- Drinkability
- Not drinkable
