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The maximum allowable limit of lead in potable water is set at 0.015 mg/L, which aligns with regulations designed to ensure the safety of drinking water. This limit is crucial because lead is a toxic metal that can cause significant health problems, particularly in young children and pregnant women. Exposure to lead can result in developmental issues, cognitive impairment, and various other health concerns.

Regulatory agencies, such as the Environmental Protection Agency (EPA) in the United States, have established this threshold based on extensive research indicating that lead levels above this limit can be harmful to health. The decision to set the limit at 0.015 mg/L reflects a balance between feasible detection and the protection of public health, ensuring that water providers take necessary measures to reduce lead exposure from plumbing or other sources.

The other options provide values that exceed the established limit or are not aligned with current health recommendations, thereby underscoring the significance of adhering to the specified maximum limit. This figure supports efforts to mitigate health risks associated with lead exposure while ensuring that the water supply remains safe for consumption.