Residents and activists in Bangkok have staged a protest over what they describe as toxic contamination in a nearby river, urging authorities to investigate the pollution sources and take immediate steps to prevent further harm.

Crowds gathered at the riverbank holding banners and raising concerns about the water’s condition, including foul smells, visible discoloration, and the effects protesters say it is already having on people who live and work along the waterway. Participants called for regular testing of water quality, greater transparency about results, and stronger penalties for polluters.

Organisers said the issue affects more than the environment, pointing to risks for health and local livelihoods tied to the river. They demanded that government agencies coordinate a full assessment of industrial discharges and waste disposal practices upstream, and that cleanup efforts be paired with long-term prevention.

Protesters also urged Bangkok’s officials to engage with affected communities directly rather than relying on statements after complaints mount. Many called for monitoring systems that can track contamination in real time and for public reporting that makes the results easy to access.

The protest concluded with demands for urgent action—investigation, enforcement, and cleanup—so the river can recover and nearby residents can live with a safer environment.