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Posted on: September 13, 2021

Water Treatment Plant to Temporarily Convert from Chloramine to Free Chlorine Disinfectant

Water Treatment Plant Settlers

Notificación en español.

The City of Midlothian public water system, (PWS) ID 0700005, will temporarily convert the disinfectant used in the distribution system from chloramine to free chlorine. The conversion will begin on October 1, 2021, and continue through October 31, 2021. During this period,  water taste and odor changes associated with this type of temporary disinfectant conversion may be experienced.

Public water systems are required to properly disinfect their water and maintain an adequate disinfectant residual in the distribution system. Chloramine, free chlorine combined with ammonia, is widely used as a disinfectant because it persists for long periods while also limiting the formation of disinfection by-product contaminants. Prolonged use of chloramine coupled with other factors that can affect water quality, such as high temperatures or stagnation of water, may result in the growth and/or persistence of organic matter within the pipes of the distribution system, which may hinder the ability to maintain an adequate disinfectant residual. A temporary conversion to free chlorine, partnered with flushing activities, helps to rid distribution pipes of this organic matter and improve the quality of our water overall.

The City of Midlothian has chosen to implement a temporary disinfectant conversion to free chlorine based on the following: 

General maintenance of the distribution system. 

The Texas Commission on Environmental Quality (TCEQ) factsheet about Drinking Water Disinfection and the Free Chlorine Conversion Process may be accessed at the link below.

For questions regarding this matter, please contact the Water Treatment Plant at 972-775-6663


Texas Commission on Environmental Quality FAQs
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