Analysis on Water Quality of Rural Centralized Water Supplies after a Flood Disaster in Fangshan District

Objectives To master the hygienic status of centralized water supplies in the "7·21" flood disaster in Fangshan District to take measures timely to guarantee the safety of drinking water and people's health.

Methods Centralized water supplies in villages were surveyed one week after the disaster, and water samples from the water supplies and taken after the emergency treatment were detected.

Results The pass rate of 152 water samples from water supplies was 19.08%, the pass rate of 124 unsterilized water samples was 10.48%, while the pass rate of 28 disinfected water samples was 57.14% (χ²=32.210, P < 0.01). The pass rate of 188 water samples taken after emergency measure was 53.72%.

Conclusions The village water supplies were contaminated in various degree after the disaster; the construction and management of partial village centralized water supplies were mismanaged and the qualification rate was low, mainly on microbial indicators and residue index of disinfectants. Emergent disinfection of water supplies must be carried out after flood disasters, the construction and management of waterworks must be perfected, the management of a long-term effective mechanism should be regulated to guarantee the safety of drinking water and the health of people.