Last Updated on October 2, 2026 by Jeff Tomas
CHIANG RAI – Local authorities in Chiang Rai have raised the official danger alert for the Mae Sai River. This warning follows shocking test results showing severe water contamination throughout the major waterway.
Officials recently discovered that arsenic levels in the river have surged to a massive 28 times the normal safety limit. In addition, lead contamination was found to be several times higher than acceptable standard levels.
The government has quickly identified five high-risk sub-districts within the busy Mae Sai area. These specific locations include Mae Sai, Pong Pha, Si Mueang Chum, Wiang Phang Kham, and Koh Chang.
Residents in these communities are now facing strict safety guidelines to protect their daily health. Officials stress that this is an urgent public health issue that requires immediate community cooperation.
Key Takeaways
- Arsenic levels in the Mae Sai River are currently 28 times above the standard safety limit.
- Five sub-districts are under strict orders to completely stop using raw river water for daily tasks.
- A new 24/7 real-time monitoring system is being prepared to closely track the water quality.
Because of the toxic conditions, officials have strictly banned all direct use of the river water. Locals must absolutely not use it for drinking, cooking, washing dishes, or making daily ice.
Furthermore, authorities urge people to immediately stop catching and eating any aquatic life from the river. This ban includes fish, shrimp, shellfish, and bottom-dwelling creatures, as they may carry dangerous heavy metals.
Pet owners must also carefully keep their animals away from drinking the contaminated river water. Meanwhile, local tap water producers now face new, significantly stricter regulations for their daily operations. Any facility using raw water from the Mae Sai River must drastically improve their treatment processes. They are required to thoroughly test the water quality before distributing it to local residential homes.
Tracking the Source of Contamination
To tackle this growing crisis, the province has quickly set up a special monitoring working group. This dedicated team is actively testing the local soil, water, agricultural crops, and the broader food chain.
Their main goal is to find the exact source of this pollution and assess ongoing health risks. They want to ensure the entire community remains safe and informed during this highly uncertain time.
In the meantime, officials are busy preparing a brand-new, real-time water quality tracking and monitoring system. This 24/7 alert system will help keep high-risk areas informed of any sudden chemical changes.
Ultimately, these strict safety measures will stay in place until new tests confirm the water is safe. Authorities promise to keep the public fully updated if any official rules or safety guidelines change.
Trending News:
Myanmar Mining and Arsenic in Chiang Rai’s Rivers
Chiang Rai Cool Season Is Here: What To Expect In Winter
