A case of infant methemoglobinemia associated with milk formula prepared from well water containing excess nitrates occurred in Texas. The existence of numerous rural wells with high nitrate concentrations has been documented in various areas through the United States in the past and again in Texas in 1969. These private wells and certain rural municipal water supplies represent a possible source for cases of methemoglobinemia.
Miller LW. Methemoglobinemia Associated With Well Water. JAMA. 1971;216(10):1642-1643. doi:10.1001/jama.1971.03180360088018