Storm Drain vs. Sewer Drain: What Homeowners Get

Storm drains and sewer drains are both part of a home’s drainage system, but they don’t do the same job. Confusing them is a common mistake that can turn routine maintenance into plumbing emergencies—and in some cases, environmental violations.

Storm drains are designed to carry rainwater from rooftops, streets, and yards to nearby waterways. Sewer drains (often called sanitary sewers) are built to move household wastewater—such as toilet waste, wastewater from sinks, and water from showers and washing machines—toward a treatment facility.