随着氯胺二次消毒的普及，氯胺化水系统中的硝化作用越来越频繁。硝化作用通常与氯胺残留损失、细菌生长增加和其他症状有关。硝化作用通常发生在滞留时间较长且通常与水温较高有关的配水系统区域。作为AWWA研究基金项目的一部分，对氯化氨水系统中硝化作用的发生进行了电话调查，以收集关于硝化发生、监测硝化、硝化控制实践和水处理数据的全国性信息。这些信息将用于确定美国硝化作用的程度和重要性。该研究的其他部分包括硝化控制案例研究和通过处理控制硝化的实验室方法。

Nitrification in chloraminated water systems is being reported more frequently as the popularity of chloramine secondary disinfection grows. Nitrification is often associated with losses in chloramine residual, increased bacterial growth, and other symptoms. Nitrification incidences most often occur in areas of the distribution system that have long detention times and are usually associated with warmer water temperatures. As part of an AWWA Research Foundation project on the Occurrence of Nitrification in Chloraminating Water System, a telephone survey was performed to gather nation-wide information on the occurrence of nitrification, monitoring for nitrification, nitrification control practices, and water treatment data. This information will be used to determine the extent and significance of nitrification in the US. Other parts of the study include Nitrification Control Case Studies and a Laboratory Method for Controlling Nitrification with treatment.