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Every 15 years, the Environmental Protection Agency’s (EPA) Office of Pesticide Programs (OPP) reviews the safety of registered pesticides. The current cycle ends in 2022. As part of that process, the agency is evaluating the safety of hypochlorite bleaches. In January 2017, EPA decided it would consider the risks posed by degradation of the hypochlorite into perchlorate.
This is important for two reasons: 1) degraded bleach is less effective as a pesticide, and 2) perchlorate is a chemical that interferes with the production of thyroid hormone, a critical hormone for fetal and infant brain development.
On September 22, EPA proposed changes to the pesticide label to minimize the degradation for hypochlorite bleach used to disinfect drinking water, and the agency is accepting comments until November 21, 2017. The label would advise users to: Minimize storage time; Maintain pH of the solution between 11 to 13; Minimize exposure to sunlight; Store at lower temperatures; and If practical, dilute with cool softened water upon delivery.
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