The minimum ppm levels are (i) Zn = 5mg/l (ii) Fe = 0.3mg/l (iii) Mn = 0.05 mg/l (iv) Cu = 1.3mg/l Too much copper can cause adverse health effects such as stomach cramps, nausea and diarrhea. Children and adults who drink water with high levels of manganese for a long time may have problems with memory, attention, and motor skills. Infants (babies under one year old) may develop learning and behavior problems if they drink water with too much manganese in it. The most common health problems in workers exposed to high levels of manganese involve the nervous system. These health effects include behavioral changes and other nervous system effects, which include movements that may become slow and clumsy.Non-carcinogenic risk for humans due to ingestion of groundwater through drinking water pathway was very high for infants, children and adults