At what level is copper considered good in drinking water?

The correct answer indicates a range in which copper is considered acceptable and safe for drinking water. Specifically, a concentration of 0 - 199 mg/L is generally recognized by health authorities as a level where the potential health risks associated with copper are minimized. At this level, copper can actually contribute beneficially to human health, given that it is an essential trace element necessary for various bodily functions, including the formation of red blood cells and maintaining healthy nerves and immune functions.

When copper levels exceed 200 mg/L, there can be an increased risk of negative health effects, such as gastrointestinal issues or long-term effects on liver and kidney function. Levels of 500 mg/L or higher are typically deemed hazardous and could lead to toxic effects. Not having a guideline suggests neglect of the potential health implications and is not ideal for public health safety. Thus, identifying 0 - 199 mg/L as the recommended range for copper helps ensure that drinking water remains safe and beneficial for consumption.