What major health risk is associated with poorly maintained pool water?

The major health risk associated with poorly maintained pool water is swimming-related illnesses. When pool water is not properly sanitized and maintained, it can become a breeding ground for bacteria, viruses, and other pathogens. For instance, excessive contamination can lead to infections such as gastroenteritis, skin infections, and respiratory illnesses. Swimmers can be exposed to these pathogens through ingestion or contact with the contaminated water, increasing the likelihood of illness.

Proper maintenance, which includes regular testing of water chemistry and ensuring adequate disinfection, is essential in preventing such health risks. This is particularly crucial in commercial settings where the volume of bathers can quickly lead to the spread of waterborne illnesses if the pool water is neglected.