Water quality 39 Water Microbiology 38 Water Supply 38 Environmental health 37 Pollution 37 Public Health 37 prevention & control 37 Environmental aspects 36 Gezondheid 36 Health aspects 36 Quality Control 36 Water 36 Water Pollution 36 Water quality management 36 standards 36 Nepal 15 Chhaupadi 5 Kathmandu 5 Knowledge 5 Guidelines 4 Health status 4 Karnali 4 Nutrition 4 Sanitation 4 Children 3 Drinking water 3 Girls 3 Water pollution 3 Water supply standards 3 World Health Organization 3