The man is in hospital after police allegedly assaulted him for marching in Mothutlung, outside Brits, The Star reported on Wednesday. He was then allegedly thrown from a moving armoured vehicle.
Residents also claim that four people are dead following the protests and not two. The two were allegedly shot dead by police.
The Independent Police Investigative Directorate is investigating the men’s deaths.
Residents began protesting on Sunday afternoon about a lack of water in the area.
Brits had been without running water for three months and water tankers arrived only every three days. Temperatures in the province are between the mid to high 30s in summer.
Locals told the Pretoria News that water supply in the area has always been erratic and when water does run it is dirty and has worms in it.
Water and Environmental Affairs Minister Edna Molewa on Tuesday promised residents that they would get water before the weekend.