How long after the Chernobyl disaster was the Kiev water supply adjusted ?
In the most affected areas of Ukraine , levels of radioactivity ( particularly from radionuclides 131I , 137Cs and 90Sr ) in drinking water caused concern during the weeks and months after the accident , though officially it was stated that all contaminants had settled to the bottom " in an insoluble phase " and would not dissolve for 800–1,000 years .