Subsoil drainage systems cannot be discharged into what?

Subsoil drainage systems are designed to collect and redirect excess water from the soil, typically to prevent waterlogging and improve plant growth or foundation stability. The appropriate discharge for these systems is crucial for environmental and public health reasons.

Discharging subsoil drainage water into a sanitary sewer is not permissible because sanitary sewers are specifically designed to handle domestic wastewater, which includes sewage and greywater. Introducing subsoil drainage water, which may contain contaminants from soil, agricultural runoff, or other sources, could compromise the integrity of the sewage treatment process. This can lead to overloads or pollution issues, as the wastewater treatment facilities are not equipped to handle additional non-sanitary water.

In contrast, storm sewers are designed to manage rainwater and drainage from paved surfaces, making them suitable for the discharge of subsoil drainage systems. Additionally, city water supplies must be protected from contamination, reinforcing the need to avoid introducing drainage water into these systems. This approach helps maintain the safety and quality of drinking water resources.