Water Microbiology 38 Water Supply 38 prevention & control 38 Health aspects 37 Water quality 37 Environmental aspects 36 Environmental health 36 Gezondheid 36 Pollution 36 Public Health 36 Quality Control 36 Water 36 Water Pollution 36 Water quality management 36 standards 36 Nepal 13 methods 5 Kathmandu 4 Medicine 4 Quality of life 3 Research 3 Aged 2 Burden 2 Elderly people 2 Environmental exposure 2 Epidemiology 2 Human anatomy 2 Kathmandu Valley 2 Knowledge 2 Medical statistics 2