Cardozo is served by 11 community groundwater wells with elevated storage tanks. Residents also obtain water from 13 shallow dug wells. Given the existing water distribution system, in October 2000 the CARE Peru Urban Environmental Health Project, with technical assistance from the CDC, developed an instrument to assess human behaviors, water storage practices, and water system conditions that could adversely affect water quality. CARE and CDC staff worked closely with technicians in Cardozo to assess the water supply system. Forty-four water samples were collected and analyzed by the Directorate of Environmental Health reference laboratory.