High concentration of Zinc above BIS limits (15 ppm) causes anemia, damage the pancreas, and decrease levels of high-density lipoprotein (HDL) cholesterol to human beings.
Permissible limit of Zn in potable water is 5 ppm. If more may cause Nausea,vomiting, loss of appetite, stomach cramps, diarrhoea and headaches. Also make lower immunity And low level of HDL cholesterols.
Dear Saxena ji please refer BIS 10500:2012 where the max permissible limit of Zinc is 15 mg/l not 5 mg/l.
In natural surface waters, the concentration of zinc is usually below 10 μg/l, and in ground waters, 10–40 μg/l . In tap water, the zinc concentration can be much higher as a result of the leaching of zinc from piping and fittings .
Permissible limit of Zn in potable water is 5 ppm (WHO).
Due to its nature as an essential trace element, oral uptake of small amounts of zinc is essential for survival. The recommended dietary allowance (RDA) for zinc is 11 mg/day for men and 8 mg/day for women ( Stromberg H.E and Agren M.S. Br. J. Dermatol. 1984)
Immediate symptoms after uptake of toxic amounts of zinc include abdominal pain, nausea, and vomiting. Additional effects include lethargy, anemia, and dizziness.
Supriya, Environmental Protection Agency, March 29, 2019 (EPA ) has stated that drinking water should contain no more than 5 ppm of Zinc in drinking water. For detail, please go through literature/online.
Zinc has a lower toxicity rate compared to lead. However, it can cause nausea, vomiting diarrhea and cramps in addition to a metallic taste in the mouth if the individual has a chronic zinc intoxication. There are discussions that the long period of water intake with the presence of zinc might trigger cancer, however, does not appear to be proven.
Useful articles and link:
Article A review of permissible limits of drinking water
Article Levels of selected heavy metals in drinking water of Peshawar city
https://pdfs.semanticscholar.org/4940/c83417f0d67546173b84ec876925292d0ef9.pdf.
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