Grey water is considered a type of wastewater which bring damage to human health and environmental if disposed improperly. This lead to research an efficient treatment method to reduce the damage. The methodology used for grey water treatment was ozonation and ultra sonication. PH, ozone dose, temperature and time were the factors effecting the overall performance of the treatment process for the two forms of grey water(car wash water and Domestic water). both the COD & oil content were measured to determine the effectiveness of the process. for carwash sample, the COD and oil content were 95%,96.5% at 0.52 mg/l ozone dose, at 55 min duration time and ph=9. As for the domestic water, the COD and oil content were 96.5%,96% at 0.52 mg/l ozone dose, at 55 min duration time and ph=9. The removal was lower for ultrasoniation.for carwash sample, the COD and oil content were 94% and 74% at 45Co, at 55 min duration time and ph=9. As for the domestic water, the COD and oil content were 97% and 96 % at 55 min duration time and ph=9. Finally, treatment of greywater with ozone has proven to be more efficient than ultrasound