Urgent Warning: Do Not Collect or Eat Shellfish from Salawin River – High Lead and Pesticide Contamination Detected
Health authorities have issued an urgent warning against collecting or consuming shellfish from Salawin River in Mae Hong Son province due to dangerous levels of pesticide and lead contamination discovered in test samples. The temporary ban is especially critical for vulnerable populations including children, pregnant women, the elderly, and those with chronic health conditions. Authorities have initiated comprehensive health risk screening and will coordinate hospital testing for affected residents.
On May 3, 2025, Phongphipat Meebenjamas, administrator of Mae Sam Laeb subdistrict in Saboei district, Mae Hong Son province, announced an urgent public advisory urging residents to temporarily avoid consuming shellfish from Salawin River. Volunteer surveillance teams had submitted samples from the river for testing, and initial results from the district research team revealed severe pesticide contamination—especially in dead shellfish—along with lead levels exceeding safety standards. Cadmium levels were within acceptable limits, and mercury was not detected.
The research team has established the following action plan:
1. Advise residents to temporarily avoid consuming shellfish from Salawin River, particularly children, pregnant women, elderly people, and those with chronic conditions such as kidney disease or cancer.
2. Request surveillance teams to collect additional shellfish samples for further testing at the Department of Medical Sciences laboratory, where tests will identify highly toxic inorganic pesticides.
3. Coordinate with local surveillance teams to conduct health risk screening. Nursing instructor Yupaaphon is currently finalizing the risk assessment form, which will then be distributed to local authorities for implementation.
4. Results from the risk screening will identify high-risk individuals. The research team will coordinate with local health centers and Saboei Hospital to collect biological samples for testing at Ramathibodi Hospital laboratory, screening for pesticides in urine and lead in blood. If contamination is detected in community members, they will be referred for appropriate medical care, and measures will be implemented to reduce future exposure to these toxins.