Survey on the benzene pollution of drinking water caused by waterproof coating in Haidian District,Beijing

OBJECTIVE To investigate the reason of the drinking water pollution in Haidian District,Beijing,and to explore the control measures on the water pollution.METHODS Based on the odor complaints of drinking water,the sanitation survey was conducted on water supply system of certain new community.Water samples were analyzed according to the National Standard Determination methods for Drinking Water Quality(GB/T 5750-2006).The assessment was made with the National Hygienic Standard for Drinking Water Quality(GB 5749-2006).RESULTS Water samples of washroom in polluted area were measured by CDC from June 2006 to March 2008.Among 1 429 specimens tested odor index,598 specimens were beyond the National Hygienic Standard,the total eligible rate of water quality was 41.8%.Among 647 specimens,we analyzed benzene,styrene,toluene,ethylbenzene,xylene and cumene,23 specimens were beyond the National Hygienic Standard,the total eligible rate of water quality was 3.6%.CONCLUSION The situation of drinking water supply and the quality of drinking water in the investigated community show that the event of water chemical pollution is caused by improper construction of waterproof coating.