Layer?s drinking water from two supplying sites in the two seasons, the concentration of ammoniacal nitrogen and nitrite-N were higher, the amount of bactria exceeded China?s drinking water criteria, but the pH accorded with the criteria.

• 两饮水点（自来水），冬春两季氨氮、亚硝酸盐氮含量较高，细菌数量严重超标，pH值均符合饮水标准。