Excess of lead in drinking water can cause

Solution:

Excess lead in drinking water or through other sources can lead to lead poisoning (plumbism). Lead is a highly toxic heavy metal that can affect multiple organ systems. One of the prominent effects of chronic lead exposure is nephrotoxicity, leading to kidney damage. Other effects include neurological damage, gastrointestinal issues, and hematological effects (anemia). Methemoglobinemia is caused by nitrates/nitrites, brown mottling of teeth by excess fluoride, and a laxative effect is not a typical symptom of lead poisoning.