The water can be treated using chlorine, ultra-violet light, or ozone, all of which act to kill or inactivate E. coli. Systems using surface water sources are required to disinfect to ensure that all bacterial contamination is inactivated, such as E. coli. Systems using ground water sources are not required to disinfect, although many of them do. Additional information on E. Coli is available at https://safewater.zendesk.com/hc/en-us/sections/203309158.
How is water treated for E. coli?
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