Seoul's drinking water has not always been safe to drink. Over the last half century, the city has really improved the quality of the tap water known as Arisu and known over 10 million people in Seoul can enjoy this water service. The water is safe to drink and conforms to all 163 items that the WHO maintains should be tested to ensure safe drinking water. Seoul's water quality tests match those of Canada at 163 and is only surpassed by Australia who tests for 199 substances. So you get an idea, the U.S.A tests for 102 substances, Japan for 121, France for 63, the U.K for 54 and Germany for 51. You can find full details by visiting the site below:
http://tinyurl.com/la2q8k3
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