D omestic activities and industry along the Cisadane River flow are sources of pollution causing the decline in water quality of the Cisadane River which results decreasing carrying capacity. This study aims to analyze the quality and Carrying Capacity of the Downstream Cisadane River Pollution Load (DTBP) using the WASP model with Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and Total Suspended Solids (TSS) and provide alternative management in the form of DTBP reduction scenarios. Data collection was carried out three times, 12/4/2022, 17/5/2022, and 24/5/2022. The research location is on the Cisadane River downstream of segments 5 to 6 which are included in the administrative boundaries of Tangerang Regency and Tangerang City with the division of 8 monitoring points and 7 decapitation segments. Analysis of pollutant source identification is carried out by field survey and map analysis using GIS. Sampling and analysis of pollutant parmeter concentrations are carried out in accordance with SNI. The results of the concentration analysis will be compared with the quality standards in PP No. 22 of 2021. The discharge values and concentrations of pollutant parameters are fed into the WASP to produce a model of the Lower Cisadane River. Potential sources of pollution in Lower Cisadane come from settlements, agriculture, industry, and other doemstic activities. The average results of TSS parameter quality analysis are 97.58 mg/l, BOD 17.80 mg/l, and COD 69.20 mg/l with the difference between DTBP and pollutant load -197727 kg/day, -59920 kg/day, and -179677 kg/day, respectively. There are five scenarios with scenarios for the use of WWTP technology and population decline. Scenario III has the result of the difference between DTBP and average pollutant load of +1602 kg/day, +603 kg/day, and +3208 kg/day for TSS, BOD, and COD parameters. Scenario V successfully had the mean value of DTBP difference for TSS, BOD, and COD parameters respectively +1179 mg/l, +638 mg/l, and +4173 mg/l.