Which of the following is a common source of water contamination in housing?

Failing sewage systems are a significant source of water contamination in housing. When sewage systems fail, untreated wastewater can leak into the surrounding environment, including groundwater sources. This can lead to contamination of drinking water supplies with harmful pathogens, chemicals, and other pollutants that pose serious health risks to residents. The presence of untreated sewage may result in waterborne diseases and other public health hazards, making it a critical issue in maintaining safe and potable water in residential areas.

In contrast, regular plumbing maintenance, cleansing of storm drains, and purification of well water are proactive measures aimed at preventing contamination. Regular plumbing maintenance helps ensure that pipes are functioning properly and that no leaks occur, thereby minimizing contamination risks. Cleansing storm drains helps to remove debris and contaminants that could otherwise flow into surface water bodies. Purifying well water involves treatment processes designed to eliminate harmful contaminants, making water safe for consumption. All these practices contribute positively to water quality, highlighting the detrimental impact that failing sewage systems can have when they are not properly managed.