History and Objectives: Due to the prevalence of parasitic diseases and the probable relation between aquaduct water usage and parasitic diseases, the present research was carried out on patients referred to the Abu-Zeydabad Clinical Laboratory during the year 1997-1998.

Materials and Methods: A descriptive study was performed on individuals referred to Abu-Zeydabad Clinical Laboratory. Patient’s information including age, sex, job, type of drinking water and the type parasitic disease were extracted from patient’s files. The files were completed by technicians by interviewing the individuals and Odd’s ratio were determined for the effect of aquaduct water usage and the prevalence of parasitic disease.

Results: Of 670 individuals under study, 340 (50.7%) and 330 (49.3%) were male and female respectively. Minimum and maximum age of the individuals were 4 and 80 years respectively. Parasitic disease was prevalent among 257 persons (38%). 55.6% of infected individuals and 30% of non-infected individuals used aquaduct water (P<0.0001). The risk of developing parasitic disease using aquaduct water is 2.9 times greater.

Conclusion: There is a close between aquaduct water usage and prevalence of parasitic diseases. Further research on the factors involved on the water contamination is recommended.