INVESTIGATION ON SANITATION OF RURAL CENTRALIZED WATER SUPPLY OF FIVE URBAN AREAS IN LANZHOU CITY

Objective To understand the current situation of rural centralized water supply sanitation of five urban areas in Lanzhou city and to provide scientific basis for improving water supply.Methods Sampling in spot and water quality detection were used to investigate the water quality of 25 water supply points in five rural areas.Results There were 15 points(60%) without water purification and without disinfection among 25 water supply points.The qualified rate of water samples was 35% and the unqualified rate of bacteriological index was higher than that of others.The unqualified rate of total numbers of colony was 51%.Conclusion The current situation of rural centralized water supply sanitation is bad in five urban areas in Lanzhou city.Measure of water treatment should be taken and administration of drinking water should be strengthened.