肯塔基州托马斯堡的肯塔基州北部水区（区）拥有并运营两座地表水处理厂，分别从俄亥俄河和利克宁河取水，日处理量为4400万加仑（mgd），日处理量为10 mgd。该地区使用游离氯进行消毒，并在两个处理厂和分配系统中的四个增压泵站添加氯。1998年，该区将较小的处理厂和四个加氯站从氯气改为次氯酸钠。2000年，该区将大型处理厂从天然气改为次氯酸钠。学区对这一转变感到高兴，因为它提高了工作人员和公众的安全。 转化过程中存在一些困难，包括进料系统中的蒸汽锁定和次氯酸钠溶液的不稳定性。对于希望进行这种转换的公用事业公司，捷运局有几项建议，包括安装pH计以指示溶液的稳定性，以及制定定期维护计划，以清除水垢和修复泄漏。

Northern Kentucky Water District (District) of Fort Thomas, Kentucky owns and operates two surface water treatment plants of 44 million gallons per day (mgd) and 10 mgd capacity that draw from the Ohio and Licking Rivers, respectively. The District uses free chlorine for disinfection and adds chlorine at both treatment plants and at four booster pumping stations in the distribution system. In 1998, the District converted the smaller treatment plant and the four booster chlorine stations from chlorine gas to sodium hypochlorite. In 2000, the District converted the large treatment plant from gas to sodium hypochlorite.The District has been pleased with the conversion because it has increased safety for both the staff members and the public. There have been several difficulties in the conversion including vapor locking in the feed systems and instability of the sodium hypochlorite solution. The District has several suggestions for utilities that wish to make this conversion including the installation of pH meters to indicate solution stability and establishment of a regular maintenance program for scale removal and leak repair.