Data on Tap Water Quality Standards

Introduction

Water quality standards for tap water are established to protect water quality so that people can lead healthy and productive lives. In 2003, the water quality standard was greatly revised in Japan. These standards are constantly revised to keep up with changing technology. As a result we can better assemble the right know-how and technology, and sequentially consider them. The water quality standard based on Ordinance 4 of Japan's Water Supply Act is provided by the "Ministerial Ordinance Concerning Water Quality Standards" (Ministry of Health, Labour and Welfare Ordinance No. 101, May 30, 2003 [Final revision, Ministry of Health, Labour and Welfare Ordinance 18, February 17, 2010]). Tap water must pass all water quality standards. As a consequence, companies and other entities whose business is to supply water must have their tap water inspected in accordance with the Water Supply Act. Items outside of water quality standards should be considered for water quality control. These items include target settings for water quality control, items where the actual detection conditions are unclear for tap water, and materials with unclear toxicity assessments. Adequate information and knowledge of these items should also be available. Tap water companies should develop plans for water quality tests and provide customers with information on the tests for water quality standard and related matters.

February 16, 2011 GMT