What consequence can result from improper use of a septic system?

The consequence of improper use of a septic system primarily pertains to the potential for groundwater contamination. Septic systems are designed to treat wastewater on-site, allowing solids to settle at the bottom of a tank while effluent is filtered through soil. If the system is not maintained properly—such as overloading it with excess water, introducing non-biodegradable materials, or failing to pump out the tank regularly—this can lead to system failure. When a septic system fails, untreated or partially treated sewage can seep into the surrounding soil and enter groundwater supplies. This contamination poses significant health risks as it can carry harmful bacteria, viruses, and nutrients that can pollute drinking water sources, thereby affecting public health and the environment.

The other options do not directly relate to the typical consequences of septic system misuse. Increased water pressure, improved air quality indoors, and heightened plumbing efficiency are not relevant outcomes associated with septic system issues.