Oil content removal by Cassia surattensis seeds was deliberated in a batch. Significance of the current study is to treat water that is associated with oil. The water contains high organic materials, which is completely dissolved. Previous processors had problems such as low efficiency and costly. Cassia surattensis seed was branded by using Fourier transform infrared spectroscopy. Contact time, dose quantity and pH value were examined for oil content elimination in produced water (PW). A declaration of pH value from 2.0–9.0 was accompanied by an improved amount in oil that was adsorbed. The high oil content removal was 79.4% at pH 2, 120 min and 2 g of Cassia surattensis seeds. The equilibrium adsorption values were obtained and studied by using the Freundlich and Langmuir models. The Freundlich model was found to obtain the finest relation with the tested values. The greatest adsorption capacity of the oil content was 12.18 mg/g. The outcome of the statistical model showed successful results, whereby the F-value was 51.9 and p-value was 0. The present study results proposed that Cassia surattensis seeds may be used as a low-cost adsorbent to eliminate oil content in produced water.