68e07683_SAHRA___Home_Water_Testing__Likely_source
[Lab result] Cadmium [Potential health effects] Drinking water with very high levels severely irritates the stomach, leading to vomiting and diarrhea. Long-term exposure to lower levels of cadmium leads to a buildup of cadmium in the kidneys and possible kidney disease. [Treatment options] Reverse osmosis or distillation systems [Likely source] 
Found in natural ore deposits. Also from corrosion of galvanized pipes; erosion of natural deposits; discharge from metal refineries
SAHRA - Home Water Testing
Likely source