AWWA C652-25

Current Revision
Disinfection of Water Storage Facilities

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The AWWA C652 standard (Disinfection of Water-Storage Facilities) is the mandatory public health defense protocol for certifying that municipal water tanks, standpipes, and reservoirs are biologically safe for drinking water. When a new water tank is built, or an existing elevated tank undergoes structural repair, interior repainting, or diver inspection, construction dust, bird droppings, organic debris, and human contact leave behind dangerous pathogens like E. coli, Legionella, and coliform bacteria. The "why" behind AWWA C652 is epidemic prevention, biological safety, and public health assurance, ensuring that clean water pumped into a storage vessel does not pick up deadly microbial contamination before reaching household taps.
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