An outbreak of E. coli O157:H7 occurred at a child care program in Fort Worth, Texas, the CCC Alternative Learning Daycare. The investigation revealed problems with food preparation and procedures at the child care program. Water supplies for the younger children were inadequate, and a pool had not been adequately chlorinated or permitted. Lunches were often eaten on the daycare grounds near a pond that collected run-off from a cow pasture. The pond water was tested and confirmed the presence of E. coli O157:H7.