http://news.xinhuanet.com/newscenter/2008-03/10/content_7751928.htm
美国24个大城市饮用水被发现含不安全物质
新华网快讯：美国9日公布的一项调查结果发现，美国24个大城市的饮用水中含有抗生素和镇静剂等多种物质，目前至少有4100万人饮用这种不安全的水。
无出处， 无调查人，无背景资料，无清楚地点, 无数据支持， 朦胧一团, 可谓劣文。
该事件原相关新闻
http://www.washingtonpost.com/wp-dyn/content/
story/2008/03/09/ST2008030901877.html?hpid=topnews
Area Tap Water Has Traces of Medicines
The Washington area's drinking water contains trace amounts of six commonly used drugs that typically turn up in wastewater and cannot be filtered out by most treatment systems....
Pharmaceuticals, along with trace amounts of caffeine, were found in the drinking water supplies of 24 of 28 U.S. metropolitan areas tested. ....
The drugs we use for ourselves and animals are being flushed directly into wastewater, which then becomes a drinking water source downstream. ....
....the drugs are found at such low levels -- parts per trillion, a tiny fraction of the amount in a medical dose. But they do view these "emerging contaminants" with concern.
more links :
http://www.cnn.com/2008/HEALTH/03/10/pharma.water1/
http://ap.google.com/article/ALeqM5hGsoyElv4ZL879LW6z2aZS0Pix7AD8VA14500