AbstractIn an attempt at partially counteracting the serious depletion of ground‐water resources at Peoria, Illinois, a method for artificial replenishment has been developed by the Illinois State Water Survey and used in two well fields. Water taken from the Illinois River is chlorinated and infiltrated into the ground‐water aquifers by means of recharge pits.Potential pollutants of physical, chemical, bacterial, and radioactive nature are present in the river at all times in varying degrees. Possible pollution of the ground water is patently inherent to the artificial recharge process.Eight years of operating experience have proven the pit method of recharge to be effective in the Peoria area. Substantial quantities of water are recharged annually and existing standards for quality have been met. The results serve to point out problems which are encountered; to emphasize the need for control measures; and to establish trends and effects which may become important in the fut