Which of the following distances is NOT compliant for public water supply lines from unlined evapotranspiration beds?

The correct answer indicates that 12 feet is not a compliant distance for public water supply lines from unlined evapotranspiration beds. Compliance distances are established to ensure that there is an adequate buffer between potential contamination sources like unlined evapotranspiration beds and public water supply lines. This is critical for protecting water quality and reducing the risk of contamination from leachate that may emanate from these beds.

In this case, guidelines typically specify minimum distances of 5 feet, 10 feet, and 15 feet to maintain safe separation and protect water supplies. Thus, while 5 feet may be suitable under certain conditions, distances of 10 feet and 15 feet are more secure options that align with health and safety regulations. The choice of 12 feet, however, does not fit neatly into the standardized compliance measures and is therefore not recognized as an adequate safe distance. This stipulation is particularly important for systems relying on infiltration to manage water waste, as it safeguards the integrity of drinking water sources.