The DKI Jakarta Environmental Service (DLH) collaborated with the Center for Environmental Research (PPLH) IPB University to investigate the cause of the death of the broom fish in the East Kalibaru River, Kramat Jati, East Jakarta. The head of the DKI Jakarta Environmental Agency, Asep Kuswanto, revealed that after the mass death of broom fish in the East Kalibaru River on July 11, 2022, a team from the DKI Jakarta Provincial Environment Service conducted an investigation by taking samples of river water at the scene on the day of the incident. The samples were then taken to the Regional Environmental Laboratory (LLHD) of DKI Jakarta Province for further analysis.