Final answer:
There is no specific USDA limit for ozone in bottled water provided in the references. The information emphasizes the importance of regulating contaminants and discusses ozone's environmental and health roles. For drinking water standards, the EPA, not USDA, usually provides guidelines for safe drinking water.
Step-by-step explanation:
The student's question concerns the maximum permissible limits of ozone in bottled water as established by the USDA. Given the provided information, however, there isn't a specified ozone limit for bottled water explicitly cited. Still, the information underlines the importance of regulating contaminants in consumables, like the lead limit set for ceramics by the FDA, and the environmental monitoring as emphasized through the depletion of ozone levels over time due to substances like CFCs (chlorofluorocarbons). Moreover, there's an emphasis on water quality, indicating the presence of thousands of impaired water bodies in the U.S. and potential concerns about groundwater protection.
Without a specific limit mentioned for ozone in bottled water, and considering ozone's role in filtering UV radiation and its lack of solubility in water, providing a numerical answer is not feasible with the current references. Yet, we can understand the critical balance between the use of ozone for sanitation purposes and the protection of water quality from excessive chemical concentrations. It is essential that substances like ozone are regulated to protect consumer health while ensuring the effectiveness of sanitization processes. The USDA oversees aspects of food and beverage safety, but for drinking water, it is typically the Environmental Protection Agency (EPA) that sets standards for contaminants and provides guidelines for safe drinking water.