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Town of Siler City to Perform Annual Temporary Switch to Chlorine Disinfection

Post Date:01/27/2020 11:44 AM

Beginning March 3, 2020, the Town of Siler City Water Plant will temporarily suspend the addition of ammonia to its water treatment disinfection process, as required by North Carolina Department of Environment and Natural Resources (NCDENR).  Siler City will resume the addition of ammonia to the water treatment disinfection process on April 7, 2020.

Siler City uses both ammonia and chlorine to form chloramines for its disinfection process. Ammonia is added to the water in a carefully regulated dose and reacts chemically with the chlorine to produce chloramines. Chloraminated drinking water is safe for drinking, bathing, cooking and many other daily uses. NCDENR requires all systems using chloramination to suspend the addition of ammonia for a one month period annually.

During the changes in our disinfection process, three groups of people need to take special precautions for higher concentrations of chlorine – kidney dialysis patients, pretreatment owners and aquatic pet owners using City water. Dialysis patients and aquatic pet owners already treat the water they use for chlorine removal. Any customer who pre-treats City water for any process should be aware of their change and consult the manufacturer of any pretreatment equipment for recommendations.

Customers with concerns may contact the Town of Siler City at 919-742-4731 or

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