What could be a potential long-term consequence of ignoring cross-connections?

Ignoring cross-connections can lead to the contamination of drinking water, which is a serious public health risk. Cross-connections occur when there is a direct link between the drinking water supply and a source of contamination, such as waste water or chemicals. If these connections are not properly managed, pollutants can flow back into the potable water system, compromising its safety. This contamination can result in waterborne diseases and negatively impact community health.

In contrast, the other options suggest positive outcomes that do not align with the implications of neglecting cross-connections. Increased efficiency in water supply, reduction in operational costs, and improvements in treatment methods are all beneficial aspects but do not address the critical health concerns associated with failing to manage cross-connections effectively. Therefore, the emphasis on compromised drinking water safety highlights the serious long-term consequences of ignoring this issue.