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Based on the 2017 water quality monitoring, the Brantas and Bengawan Solo water quality conditions in East Java have decreased. According to water quality standards, indications of the discharge of liquid waste into rivers which causes polluted water. Based on water quality standards there are indications of the discharge of liquid waste into rivers which causes polluted water. One of the industrial wastes is sugar factory waste. The purpose of the research is to test the quality of wastewater to the content of PO4 levels in wastewater based on the quality limits of ministerial regulations and WHO. The research method used by conducting experiments on liquid waste with three sampling points that will be treated as much as 6 days and 3 replications are using Ipomoea aquatic (water spinach). By using post-only control group design. The results of the study revealed that phosphate levels at the beginning of the plant waste disposal showed high concentrations before being treated at 0.86 mg / L. It was known that on the fifth day it decreased to 0.61 mg / L, based on the phosphate level threshold, the phosphate level in wastewater still exceeded the threshold of ≥ 0.07 according to WHO provisions.