how much manganese is in water
Because these are guidance values, public water systems are not required to meet these values and some do not. 1  If you have an infant who drinks tap water or drinks formula made with tap water, a safe level of manganese in your water is 100 micrograms of manganese per liter of water (Âµg/L)* or less. If you have an infant who never drinks tap water or formula made with tap water, a safe level of manganese in your water is 300 Âµg/L or less. If everyone in your household is more than one year old, a safe level of manganese in your water is 300 Âµg/L or less.