Chiang Rai:The Mae Sai River in Chiang Rai province is in a critical state as arsenic levels have been recorded at 17 times above the normal limit. This alarming situation has raised concerns about the potential impact on the ecosystem and the livelihoods of the local population. The water's turbidity has also exceeded standard levels, contributing to the crisis.
According to Thai News Agency, although there has been a slight decrease in arsenic levels from previously being 28 times above the standard to the current 17 times, the situation remains unresolved. The river's raw water can now be used for tap water production, but arsenic levels still exceed safety standards, posing ongoing risks to public health and the environment.
Mr. Niwat Roikaew, Chairman of the Rak Chiang Khong Group and Director of the Hoong Hien Mae Khong Local Knowledge Institute, described the contamination as severe, nearing a catastrophic state for the river, its ecosystem, and local livelihoods. The high turbidity of the water has previously made it unsuitable for tap water production. Additionally, the river is contaminated with various chemicals and heavy metals.
The contamination issues in the Mae Sai River have been ongoing for over three years, initiated by floods and mudslides in the area. Despite the government's awareness of the problem, their response and management have been slow, exacerbating the situation. Efforts to coordinate with Myanmar to address pollution sources and mining have yet to yield concrete progress.
The presence of small-scale gold mines poses another challenge, as these operations involve direct mining within rivers, using chemicals that contribute to ongoing water contamination. Furthermore, the proposed Pak Beng Dam project presents additional risks. If constructed, it could raise water levels, potentially flooding areas with mining residues, leading to the accumulation of toxins and creating a "toxic reservoir."