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Being "not lead safe" means that the levels of lead present in an environment, product, or material exceed the limits deemed safe by regulatory authorities, thus posing a significant risk of lead poisoning and exposure. Various standards define these unsafe limits: the U.S. Environmental Protection Agency (EPA) sets the lead action level in drinking water at 15 parts per billion (ppb), while the Consumer Product Safety Commission (CPSC) mandates that lead in children's products must not exceed 100 parts per million (ppm). Additionally, the threshold for lead in paint is set at 0.009% lead by weight. If any product, material, or environment tests above these levels, it is considered not lead safe, meaning it presents a heightened risk of lead exposure and associated health impacts. Such elevated lead levels can lead to serious health issues, particularly in children, including cognitive impairments and developmental delays, necessitating immediate remediation and intervention to protect public health.