What is Hot Spring?

It is defined by the Hot Spring Bill passed in 1948.

It is defined by the Hot Spring Bill passed in 1948.
The water that is hot, steam, gas or contains minerals. (except the natural gas which mainly contains hydrocarbon)
The water temperature exceeds 25℃ at the source, or contains the following properties more than prescription.

If it is over 25℃, defined as Hot Spring without any other conditions.
If it is under 25℃, only when it contains the following properties more than prescription, defined as Hot Spring

Classification of Mineral Springs

（1）Classification of Hot Springs

		Temperature
	Cold Mineral Spring	Under 25℃
Hot Spring	Low Temperature Spring	Over 25℃ under 34℃
	Hot Spring	Over 34℃ under 42℃
	High Temperature Spring	Over 42℃

（2）Classification of Waters

Mineral Water classified by pH content just as it gushes out.

Acidity	Under pH3
Weak Acidity	Over pH3 under 6
Neutrality	Over pH6 under7.5
Weak Alkalinity	Over pH7.5 under 8.5
Alkalinity	Over pH8.5

Definition of Mineral Springs

Temperature （just as piped from the fountain.）: over 25℃
Properties (one out of the following lists）

Name	Content（in 1kg）
Solute Materials(except gas）	Total amt. over1,000mg
Free Carbon Dioxide	Over 250mg
Lithium Ion	Over 1mg
Strontium Ion	Over 10mg
Barium Ion	Over 5mg
Ferroion + Ferric Ion	Over 10mg
Manganese（the first manganese ion）	Over 10mg
Hydrogen Ion	Over 1mg
Bromine Ion	Over 5mg
Iodine Ion	Over 1mg
Fluoride Ion	Over 2mg
Hydrogen Arsenate Ion	Over 1.3mg以
Metaarsenite	Over 1mg
Sulfur	Over 1mg
Metaboric Acid	Over 5mg
Meta Silica	Over 50mg
Sodium Bicarbonate	Over 340mg
Radon	Over 20×(the -10th power of 10) Curie Unit（Over 5.5Mache Unit）
Radium Chloride (as Re)	Over 1×(the -8th power of 10)mg

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