对美国使用氯胺盐的公用事业公司进行了调查，以评估配水系统中的硝化发生率，并确定是否可以根据基本系统和水质数据预测硝化作用。据估计，美国三分之二的大型和中型氯胺盐系统在一定程度上经历了硝化作用。约四分之一的受访公用事业公司报告了中度至重度硝化问题。此外，每四家公用事业公司都不知道其系统中的硝化程度。硝化作用的发生在夏季或温度高于15摄氏度（59华氏度）时更为频繁；然而，有几个地点在冷水条件下取样- -例如，低于10摄氏度（50华氏度）——也证明了硝化作用。没有一个水质参数本身是硝化作用的良好指标，但应综合评估几个重要因素——亚硝酸盐、硝酸盐、氯胺用量和残留量、氨、pH值、异养细菌计数和溶解氧。包括35个参考文献、表格和图表。

Utilities in the United States that chloraminate were surveyed to evaluate the incidence of nitrification in distribution systems and to determine whether nitrification can be predicted from basic system and water quality data. An estimated two thirds of medium and large US systems that chloraminate experience nitrification to some degree. About every fourth surveyed utility reported moderate to severe nitrification problems. In addition, every fourth utility did not know the extent of nitrification in its system. The incidence of nitrification was more frequent during summer or when the temperature was greater than 15 degrees C (59 degrees F); nevertheless, several sites sampled under cold water conditions--ie., below 10 degrees C (50 degree F)--also evidenced nitrification. No one water quality parameter by itself is a good indicator of nitrification, but several important factors should be evaluated collectively--nitrite, nitrate, chloramine dosage and residual, ammonia, pH, heterotrophic bacterial counts, and dissolved oxygen. Includes 35 references, tables, figures.