Regression analyses of dissolved chemical content in fresh water from the Baton Rouge aquifers show that the sodium, calcium, and magnesium abundances are functions of the distance from the area of intensive industrial withdrawals and the depth of the well screen. However, a new way of describing the hydrochemical facies gives a better indication of dynamic conditions. For each sample, the cations and anions that constitute 5 percent or more of the total epm value were listed in order of decreasing abundance and the water is classified on this basis. Apparently, the Baton Rouge fault is the only geologic structural feature with any influence on the distribution of the hydrochemical facies. Primary recharge of the aquifers occurs through infiltration of Mississippi River water, with possible slight mixing of water from the Amite and Comite Rivers. (Modified author abstract)