How should potable water systems be installed?

Installing potable water systems separately from non-potable systems is essential for maintaining public health and safety. By keeping these systems distinct, you ensure that there is no risk of cross-contamination, which can occur if potable water comes into contact with non-potable sources. This separation is critical in preventing waterborne diseases and ensuring that the drinking water supply remains clean and safe for consumption.

In the context of plumbing codes and regulations, such as those described in Massachusetts' plumbing laws, adhering to this separation helps fulfill the legal requirements for safe plumbing practices. Additionally, it supports the overall integrity of the plumbing system by ensuring that potable water remains uncontaminated from potentially harmful substances that may be present in non-potable water systems.

The other choices may seem plausible but do not prioritize the critical safety requirements that govern the installation of potable water systems. Having potable systems intertwined with non-potable ones poses a significant risk of contamination. Installing them above ground for visibility does not inherently address safety or contamination issues and may overlook important considerations related to aesthetics and structural integrity. While having easily accessible valves can facilitate maintenance, it does not address the fundamental necessity of keeping potable water systems separate to protect public health.