Chemicals potentially harmful to human health, collectively known as PFAS, were detected in about 20 percent of tap water in Japan, though no samples contained the maximum permissible amount tentatively set by the government, a survey showed Friday.In the government's first large-scale survey covering even small water utility companies, the chemicals were detected in water samples from 332 water companies in 46 of the country's 47 prefectures out of 1,745 companies surveyed.The Environment Ministry and the Ministry of Land, Infrastructure, Transport and Tourism has been conducting tap water…READ FULL ARTICLE