What must be ensured about the condition of sewer pipes when determining distances to public water supply lines?

Ensuring that sewer pipes are watertight is crucial when considering distances to public water supply lines because it directly relates to public health and safety. Watertight sewer pipes prevent the leakage of wastewater into the surrounding soil and groundwater. If sewer pipes are not watertight, contaminants can escape and potentially reach the water supply, posing health risks to the community.

Maintaining adequate separation distance is a key aspect of design and regulation, as it minimizes the chances for any cross-contamination between sewage and potable water sources. This is especially important in areas where both sewer pipes and water lines run close together, as it safeguards the integrity of the public drinking water supply.

Other options like being underground or accessible do not address the critical concern of potential contamination, nor does the condition of being new inherently ensure safety; older pipes can be watertight if they have been properly maintained. Thus, the focus on watertightness is pivotal in upholding sanitation standards and protecting public health when assessing distance requirements.