The water quality situation in the Salween River has raised serious concerns after the Office of Environment and Pollution Control Region 1 (Chiang Mai) reported the results of its third round of water testing conducted in late March 2026. The findings show arsenic levels in surface water ranging from 0.049–0.060 mg/L, exceeding the standard limit of 0.01 mg/L by 4–6 times—marking the highest levels ever recorded.
A review of previous tests indicates a continuous upward trend. The first test in November 2025 found arsenic levels at 0.023–0.029 mg/L, which increased to 0.034–0.038 mg/L in the second round conducted in January 2026. This steady rise highlights a worsening contamination situation.
Other heavy metals—including cadmium, copper, nickel, chromium, zinc, mercury, and manganese—remain within acceptable limits. Lead, which exceeded standards in the first test, has since returned to normal levels in subsequent tests.
Academics have issued warnings to residents in the area, advising them to avoid using river water for consumption or daily use, refrain from consuming aquatic animals, and limit activities in the river due to potential health risks. Authorities continue to closely monitor the situation and urge the public to stay informed through official updates.
This situation underscores the urgent need for effective monitoring and pollution management to protect public health and preserve the river ecosystem in the border region.
Cr. lanner news
