Chlorine chemistry contributes to the safety of drinking water and swimming pools. Thousands died each year from waterborne diseases such as cholera, typhoid fever, dysentery, and hepatitis A until towns began routinely treating drinking water with chlorine-based disinfectants. Chlorine-based pool and spa disinfectants like dichlor1 and trichlor2 help keep recreational waters safe by killing bacteria that might cause illnesses like diarrhoea, swimmer's ear, or skin rashes like athlete's foot.

Chlorine chemistry is used to create home chlorine bleach, which can be used to whiten and disinfect clothing as well as kitchen and bathroom surfaces. Diluted bleach and water solutions are particularly effective for killing microorganisms that cause illness on domestic surfaces, such as norovirus (commonly known as the "stomach bug") and seasonal flu.

Chlorine chemistry contributes to safe and abundant food by protecting crops from pests and disinfecting kitchen worktops and other food-contact surfaces, killing E. coli, salmonella, and a variety of other foodborne pathogens.

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