
Muang Chiang Mai mayor Thassanai Buranupakorn led officials to inspect the water quality, a few days after Facebook users flagged this as a potential issue.
Khu Muang Chiang Mai is a popular destination for Songkran revellers.
Thassanai said the municipality lowered the water in the canal last month and replaced the water from an irrigation canal and also put chlorine in the water several times to increase the water quality.