Tougen Kurobe Unazukionsen
TOGEN 黒部 宇奈月温泉
Toyama Kurobe
富山県 黒部市

Unazuki Onsen Gensen

Analysis Verified
宇奈月温泉
Pristine Piped Gorge Spring

Flowing from the Kuronagi Onsen located upstream along the Kurobe River, the Unazuki Onsen Gensen was successfully piped to the town in 1923 through a grueling seven-kilometer wooden pipe construction. Today, the 98.3°C naturally gushing waters are widely distributed to the town's inns and public baths, deeply tied to the region's pioneering history.

AI Generated
SPRING TYPE
Simple Spring

Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.

See features & indications
Bathing indications
Autonomic instabilityInsomniaDepression
Definition :Total dissolved solids (excluding gases) below 1,000 mg/kg; water temperature 25°C or above.
Source: 環境省「あんしん・あんぜんな温泉利用のいろは」(監修:日本温泉気候物理医学会)Read full article
PH VALUE
8.2
Mildly Alkaline
Acidic ← 07 Neutral14 → Alkaline
Upper bound of mildly alkaline (pH 8.5). Notable soap-like cleansing and keratin-softening effects. Known as a "beauty spring".
TEMPERATURE
98.3
Very Hot Spring
Near boiling, extremely hot. Requires substantial cooling or dilution.
KEY MINERALS

The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).

Fluoride ionSee detail
6.2 mg/kg

A trace antibacterial component that keeps skin clean.

Metaboric acidSee detail
4.4 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

Metasilicic acidSee detail
26.9 mg/kg

A natural moisturizer that leaves a hydrated feel on the skin.

Bicarbonate ionSee detail
132 mg/kg

Softens dead skin cells for a silky bathing feel.

Sodium ionSee detail
99.8 mg/kg

Gentle warming effect that helps you stay warm after bathing.

CHARACTER · COMPOSITION PROFILE
1234StimulationBactericidalSkin BeautyHeat RetentionRelaxation

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.

USAGE
Free-Flowing Onsen
HeatedNo
DilutedNo
RecycledNo
FilteredNo
DisinfectedNo
AdditivesNo

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.

EFFECTS
Spring-specific indications (bathing)
Chronic pain or stiffness in muscles and jointsMuscle stiffness due to motor paralysisPoor circulationPeripheral circulatory failureGastrointestinal dysfunctionHigh blood pressure (mild)Impaired glucose tolerance (diabetes)DyslipidemiaMild asthma or emphysemaHemorrhoid painStress-related symptoms (sleep disordersdepressionetc.)ConvalescenceFatigue recoveryHealth promotionAutonomic instabilityInsomniaDepression
Contraindications
Active phase of illness (especially with fever)active tuberculosisadvanced malignanciessevere anemia or significant physical debilitationsevere heart or lung disease causing shortness of breath with slight exertionsevere kidney disease with swellinggastrointestinal bleedingvisible bleedingacute exacerbation of chronic diseases
BATHING TIPS
AI Generated

Gushing at an extremely high temperature of over 98°C, the water is often adjusted for comfortable bathing. This mild, weakly alkaline simple spring is gentle on the skin, but start with brief soaks to let your body acclimate gradually.

EFFECT STORY
AI Generated

Despite its intense source temperature of 98.3°C, the water contains a gentle 402 mg/kg of dissolved components, making it soothing for the body. Ideal for days when you want to gently melt away daily stress, chronic pain, and poor circulation while warming yourself to the core.

CAUTIONS
AI Generated

Effective for soothing chronic joint pain and poor circulation. Avoid bathing if you suffer from highly active diseases, severe anemia, or advanced heart conditions.

※ See the analysis data below for detailed contraindications

ANALYSIS DATAView all analysis fields ▼

Source Info

Source name
宇奈月温泉
Spring type
単純温泉
Source temperature
98.3℃
pH
8.2
Osmotic pressure
低張性

Analysis Document

Analysis date
2014-10-03
Analyst organization
富山県衛生研究所
Registration No.
富山-01

Cations

Lithium ion Li⁺
0.40 mg/kg
Sodium ion Na⁺
99.8 mg/kg
Potassium ion K⁺
5.0 mg/kg
Ammonium ion NH₄⁺
0.27 mg/kg
Magnesium ion Mg²⁺
0.27 mg/kg
Calcium ion Ca²⁺
12.3 mg/kg
Zinc ion Zn²⁺
0.13 mg/kg
Lead ion Pb²⁺
0.00 mg/kg
Strontium ion Sr²⁺
0.19 mg/kg
Copper ion Cu²⁺
0.00 mg/kg
Total cations
0.12 mg/kg

Anions

Fluoride ion F⁻
6.2 mg/kg
Chloride ion Cl⁻
77.9 mg/kg
Sulfate ion SO₄²⁻
27.2 mg/kg
Bicarbonate ion HCO₃⁻
132 mg/kg
Bromide ion Br⁻
0.23 mg/kg
Hydrogen metasilicate HSiO₃⁻
0.82 mg/kg
Metaborate ion BO₂⁻
0.39 mg/kg
Total anions
0.24 mg/kg

Undissociated Components

Metasilicic acid H₂SiO₃
26.9 mg/kg
Metaboric acid HBO₂
4.4 mg/kg
Total undissociated
0.03 mg/kg

Dissolved Gas

Free carbon dioxide CO₂
7.5 mg/kg
Total dissolved gas
0.01 mg/kg

Totals

Total dissolved substances
0.39 mg/kg
Component total
0.40 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, Muscle stiffness due to motor paralysis, Poor circulation, Peripheral circulatory failure, Gastrointestinal dysfunction, High blood pressure (mild), Impaired glucose tolerance (diabetes), Dyslipidemia, Mild asthma or emphysema, Hemorrhoid pain, Stress-related symptoms (sleep disorders, depression, etc.), Convalescence, Fatigue recovery, Health promotion, Autonomic instability, Insomnia, Depression
Contraindications
Active phase of illness (especially with fever), active tuberculosis, advanced malignancies, severe anemia or significant physical debilitation, severe heart or lung disease causing shortness of breath with slight exertion, severe kidney disease with swelling, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic diseases

Drinking

Drinkability
Not drinkable

Want to visualize your own hot spring analysis?

Just photograph and upload — AI will organize it for easy reading.

Upload Analysis
The descriptions, catch phrases, and translations on this page are generated by AI (Claude). pH, temperature, and component values are OCR-extracted from the official analysis report. Learn more