What health risks are associated with untreated stream pollution?

Untreated stream pollution poses significant health risks, particularly through the presence of waterborne diseases caused by bacteria and viruses. When streams are polluted, pathogens such as E. coli, Giardia, and various viruses can be introduced into the water. These microorganisms can lead to serious health complications if humans come into contact with or consume contaminated water.

Waterborne diseases manifest in various ways, often affecting the gastrointestinal system, leading to symptoms such as diarrhea, nausea, and vomiting. In some cases, these infections can cause more severe health issues, especially in vulnerable populations such as children, the elderly, and those with weakened immune systems. The variety of pathogens found in polluted water sources highlights the widespread risks associated with untreated stream pollution and underscores the importance of proper waste management and water treatment practices to protect public health.

Other options suggest health effects that are either limited in scope or not directly related to the primary risks of untreated stream pollution. Skin infections, while a potential risk, are not the most prevalent or serious concern compared to waterborne diseases. Respiratory problems are not typically associated with aquatic pollution unless there are specific conditions like aerosolization of contaminants. Similarly, allergies to aquatic plants may occur, but these are less common and not a direct result of stream pollution. The focus