Background: Producing compost out of municipal solid wastes and organic materials is one of the main ways to recycle organic materials which plays an important role in waste management. Compost can also bring some toxic substances such as heavy metals into the soil and food chain and these substances have negative effects on the living things.

Methods: This research is a cross-sectional descriptive study which was carried out during two seasons of spring and summer on Zahedan vermicompost factory. There were 100 samples in the research and the rate of mobility of heavy metals of lead, cadmium, and nickel was measured through five-step sequential extraction method. Then the hazard of the metals was assessed too.

Results: The results show that the highest rate of mobility is related to chromium and then cadmium and lead. Moreover, the risk assessment of heavy metals estimates the average risk of all three metals for the living things in the environment.

Conclusion: Heavy metals of lead and cadmium and nickel in Zahedan compost are less than the standard that is set for Iran.