CHIANG RAI – The government has approved more than 188 million baht to address pollution in Chiang Rai’s Kok River and Sai River, after concerns over heavy metal contamination linked to mining activities in Myanmar. At the same time, agencies are stepping up water quality checks, health screening, and clean water support for communities in Chiang Rai.
On March 17, 2026, Lalida Periswiwatthana, Deputy Government Spokesperson, said the Cabinet had acknowledged a progress report on efforts to solve cross-border pollution affecting the Kok River and Sai River in Chiang Rai.
The problem is tied to Chinese gold mining and rare earth mining in Shan State, Myanmar, near the upstream areas of both rivers. Because of this, Thai authorities are watching the situation closely.
Key concerns include:
- mining operations upstream that may involve hazardous chemicals
- possible contamination by heavy metals such as arsenic, cadmium, and mercury in soil and sediment
- risks to raw water sources, daily household use, and river ecosystems on the Thai side
Five main measures to protect residents and restore water quality
The Ministry of Natural Resources and Environment, along with related agencies, has implemented a comprehensive response plan to manage the issue and mitigate risks for local people.
1. Water quality monitoring
First, the Pollution Control Department is testing river water for heavy metals twice a month. It is also checking the sediment once a month.
In addition, the agency is sharing results on its website and providing basic arsenic test kits for public use.
2. Public health monitoring
At the same time, the Department of Disease Control is improving active surveillance and health screening for people living in high-risk areas.
The Department of Health is also checking village tap water systems. So far, most of the water tested still meets safety standards.
3. Clean water support
Meanwhile, the Provincial Waterworks Authority is closely monitoring raw water sources and supplying clean water to affected areas when needed.
Officials are also planning long-term upgrades to village water systems so communities can access safer water more reliably.
4. Checks on farming and fisheries
Authorities are also testing rice, aquatic animals, and farm products for chemical residue and contamination.
At present, results show that contamination levels in food products have not exceeded the safety limits set by the Ministry of Public Health.
5. Budget and long-term recovery
The Cabinet has approved 14 projects with a total budget of 188.36 million baht for 2026 to 2027. These projects focus on restoring water sources and improving long-term management of the pollution problem.
Thailand seeks closer coordination with Myanmar
Beyond domestic action, Thailand has proposed a Joint Technical Working Group with Myanmar. The goal is to share water quality data and carry out joint field surveys based on scientific evidence.
This approach is expected to help both sides address the source of the pollution in Shan State in a more direct and practical way.
Lalida said the government is giving priority to public health and human rights, and will move forward with all necessary measures so the response to cross-border pollution can produce lasting results.
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