The maximum prescribed concentration of copper in drinking water is :
(A) 5 ppm
(B) 0.5ppm
(C) 0.05 ppm
(D) 3 ppm

Hint: Minerals that are often present in mineral water include: calcium, magnesium, potassium, sodium, bicarbonate, iron, copper. Your body needs some copper to stay healthy, but too much copper intake is harmful.

Complete answer:
Copper is a metal that occurs naturally and is used to make many products, including parts for plumbing systems. Copper can get into your drinking water as the water passes through your household plumbing system. Too much copper intake of copper can cause vomiting, diarrhea, stomach cramps, nausea, liver damage, and kidney disease. People who are having Wilson’s disease and some infants (babies under one year) are found to be extra sensitive to copper. Their bodies are not able to remove extra copper easily.
The normal adult requires approximately two to three milligrams of copper per day. More than 90% of your daily dietary need for copper is provided by food. Less than 10% of your daily copper intake is provided by Drinking water.
Maximum concentration of copper prescribed in drinking water is 3 ppm. Above this concentration water becomes toxic.

Hence D is the correct option.

Note:
Water is very important to the human body. Every one of your cells, organs and tissues use water to help with temperature regulation, keeping hydrated and maintaining bodily functions. In addition, water acts as a lubricant and cushions your joints.