What should be the separation distance when water under a sewer is constructed with ferrous materials?

The recommended separation distance of 10 feet between waterlines and sewer lines constructed with ferrous materials is based on health and safety regulations designed to prevent contamination of the drinking water supply. Ferrous materials, which can be prone to corrosion, may lead to the leaching of harmful substances into the surrounding ground if they fail or if there is a leakage. This distance ensures that any potential contaminants from the sewer line are kept at a safe distance from the water supply, significantly reducing the risk of water quality issues and public health hazards.

Moreover, maintaining adequate separation is essential for allowing adequate space for maintenance and repair work on both the water and sewer lines without compromising the integrity of the other. The 10-foot guideline also aligns with industry best practices that take into account various factors, including soil conditions and the possibility of groundwater movement, further reinforcing the importance of these standards in public health considerations.