Final answer:
Standards for public drinking water safety in the U.S. are set by the Environmental Protection Agency (EPA), under the Safe Drinking Water Act. The EPA regulates both primary and secondary contaminants to ensure safe and clean drinking water for the public. The correct answer to the question is C. The EPA.
Step-by-step explanation:
To ensure the safety of all drinking water from the public water supply in the United States, standards are set by the Environmental Protection Agency (EPA). The EPA is tasked with setting and enforcing standards under the Safe Drinking Water Act to protect the public by regulating the nation's public drinking water supply. This act, originally established in 1974 and amended in 1986, enables the EPA to monitor and regulate contaminants in water systems that serve over 25 people. These standards include regulation of both primary contaminants, which could be harmful in small quantities like mercury and arsenic, and secondary contaminants, which may affect the cosmetic aspects of water such as color, taste, and odor.
The EPA oversees states, local governments, and water suppliers to make sure these standards are met, and the compliance is mandatory. If high levels of contaminants are found, public notifications must be announced to consumers. This comprehensive monitoring and regulation aim to prevent waterborne illnesses and ensure safe drinking water across the United States.
In conclusion, the correct option for the entity responsible for setting the safety standards for public water supplies in the U.S. is C. The EPA.