日本饮用水质量标准已根据初步健康风险评估进行了修订。标准和指南中列出的污染物数量大约相当于旧标准的三倍。根据饮用水中污染物的初步调查结果，很少检测到像新的饮用水质量标准那样高的潜在危险污染物。此外，环境署于1993年3月参照新的饮用水质量标准修订了健康相关参数的环境水质量标准。 因此，可能会有一些公共水厂立即采取行动改善饮用水质量。公共供水部门和环境水质量管理部门之间开展了更有效的合作，以更好地管理饮用水质量，这是由两项与水资源保护有关的新法律发起的。然而，新的饮用水质量标准有望成为一个非常有效的工具，促进消费者与公共供水机构之间的沟通，并从整体上改善饮用水质量。

The Japanese drinking water quality standards have been amended based on a preliminary health risk assessment. The number of contaminants listed in the standards and guidelines equate to about three times that of the old standards. According to the result of the preliminary survey of contaminants in drinking water, it is rare to detect potentially hazardous contaminants as high as the level of the new drinking water quality standards. Also, the Environmental Agency revised the Ambient Water Quality Standards of health related parameters in March 1993 by referring to the new drinking water quality standard. Therefore, there may be a number of public water works at which immediate action will be taken for improving drinking water quality. More effective cooperation between the public water supply sector and the ambient water quality management sector for better drinking water quality management has been launched by two new laws related to water resource conservation. However, the new drinking water quality standards are expected to be a very effective tool to facilitate communication between consumers and public water supply authorities and to improve drinking water quality as a whole.