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Manchester Waterworks to switch from chloramines to free chlorine for distribution maintenance; ARPA‑funded pump station work planned
Summary
Staff reported nitrification in storage tanks and will temporarily convert the distribution disinfectant from chloramines to free chlorine for roughly six weeks to remediate bacteria growth. The board also heard updates on ARPA-funded pump‑station and treatment plant projects and other operational maintenance.
Manchester Waterworks staff told the Board on Aug. 28, 2025, that the utility is switching its distribution disinfectant from chloramines to free chlorine to address nitrification and depressed chlorine residuals detected in recent tank and distribution sampling.
Director Mia and operations staff reported that tank samples showed signs of nitrification, including loss of chlorine residual and depressed pH. To remove ammonia (the food source for nitrifying bacteria) and restore normal disinfectant residuals in the distribution system, staff scheduled a temporary switch to free chlorine beginning the Tuesday after the meeting and expected the program to run roughly six weeks, with continued…
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