Our message is for people to enjoy our abundant natural resources, but to be careful while doing so. But even when the water appears to be crystal-clean it may contain microorganisms or chemicals that can cause illnesses if they enter your body. Guidry says these conditions exist in waterways throughout Louisiana, the United States and in other countries. Illnesses associated with poor water quality include diarrhea, sore throats, stomach cramps or vomiting. Children, the elderly or persons with a weakened immune system are at greater risk of getting sick when swimming in waters that harbor natural and man-made contaminants.
Some microorganisms occur naturally.
Others come from human and animal waste. These enter the water from sewage overflows, polluted storm water runoff, sewage treatment plant malfunctions, urban and rural runoff after it rains, boating wastes, malfunctioning individual sewage treatment systems and agricultural runoff. Microorganisms can enter the body through the mouth, nose and ears. Therefore, swallowing the water or immersing one's head increases the risk of illness. DHH has prepared a water safety guide that provides information on polluted waters.