水道水・井戸水・水質基準
水道水・井戸水・水質基準
水道水の水質基準や井戸水の安全性など、身近な水の水質に関する基礎知識をまとめました。
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What are the three levels of water quality standards? 【Basic Knowledge】
Are the mandatory standards, effort targets, and candidates under investigation actually divided into three levels for water quality standards?
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Why are there 51 items in the water quality standards? 【Basic Knowledge】
Since the enactment of the Water Supply Act in 1957, how have the standards accumulated up to the present day in the Reiwa era?
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What are the water quality standards for tap water? 【Basic Knowledge】
Who is responsible for ensuring the safety of tap water, and how is it done? What is the system behind the "water quality standards" that you should know about?
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Why is the electrical conductivity of tap water not zero? 【Basic Knowledge】
Pure water is almost zero, but tap water is 10-20 mS/m? What is the reason for that!
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Why is well water not considered as safe as tap water? 【Basic Knowledge】
What is the difference in safety between deep wells and shallow wells? The geological layers hold the key!
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Why is industrial water separate from tap water? 【Basic Knowledge】
Industrial water is cheaper than tap water, even though it can't be consumed? The reason lies in measures against land subsidence!
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What is the difference between pure water and tap water? 【Basic Knowledge】
Why is pure water "zero impurities"? An explanation of how purity is measured using resistivity!
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Are there few countries where tap water can be drunk as is? 【Basic Knowledge】
Why is tap water in Japan safe all the way to the faucet? An explanation of the differences with water conditions around the world!
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