Nearly 200 Cambodian garment workers have collapsed after drinking water suspected on being contaminated.

110 workers at Cheer Wiew Textiles Cambodia Ltd collapsed Tuesday and were taken to hospital.

Another 73 workers collapsed Wednesday after they reported for duty.

In total, 1,200 workers have been sent home to rest and will return to the factory, located on the outskirts of Phnom Penh, on Monday.

Phnom Penh's Dangkao district police chief Mom Saveth told AFP that: "Some of the victims vomited, found it difficult to breathe and were exhausted. Some were put on oxygen in hospital."

"We are awaiting results from a laboratory test on the drinking water from the Ministry of Health," he said.

Conditions at Cambodian factories are monitored under a unique arrangement between the government and the International Labour Organisation.