Around 99 percent of water supplied to the population is unfit for human consumption due to which over 200,000 children under five die from diarrhoea, typhoid fever, cholera and hepatitis A and E every year. Pakistan Council for Research in Water Resources (PCRWR) scientist Hifza Rasheed said this during a five-day training workshop titled "The challenges of sustainable water supply services' organised at the PCRWR Headquarters here on Monday. Sponsored by the Dutch government, the workshop was attended by a large number of mangers of water supply agencies from across the country.