What is one of the primary environmental concerns with untreated sewage discharge?

One of the primary environmental concerns with untreated sewage discharge is the contamination of drinking water sources. When untreated sewage is released into bodies of water, it can introduce a variety of harmful pathogens, chemicals, and nutrients. This pollution poses a serious risk to public health as these contaminants can make their way into drinking water supplies, leading to waterborne diseases and health problems in humans.

Additionally, the nutrients in untreated sewage, such as nitrogen and phosphorus, can lead to eutrophication, which is the excessive growth of algae in water bodies. This process can further degrade water quality and disrupt aquatic ecosystems. Ensuring the proper treatment of sewage before it is discharged is crucial to protect drinking water sources and maintain overall environmental health.

Other options, while important in different contexts, do not directly address the immediate health risks associated with untreated sewage discharge as distinctly as drinking water contamination does.