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Content: When currents change during an afternoon of swimming, people in the water may be surprised and may find it hard to return to the beach. Fourthly, the transition from un-deep to deep water may occur very sudden. In deep water the risk of obtaining swimmers cramp is much higher and there are ships, surfers and sailors that may overlook swimmers. It is not wise to go swimming in harbours, in waterways, or near floodgates. Fifthly, there is a risk to swimming in polluted water. One should not swim near industrial points of discharge or near sewer water treatment plants. Make sure that there is no dirt or dead plant and animal material in the water on the location where you are swimming. For your own safety it is always better to go swimming on supervised locations and to not let your kids enter the water alone. Health effects
When one takes a swim in water that contains pathogens, one might end up being ill. Pathogens enter the body during swimming activities and when one accidentally swallows swimming water.