The difference between sewer & storm drains

What are storm drains and how do they differ from sewer drains?

When it comes to urban drainage systems, many people confuse storm drains with sewer drains. Although both systems manage wastewater, their purposes and functions are distinct. In this article, we will explain what storm drains are, the differences between storm drain vs sewer, and why it is essential to understand their functionality.

What are storm drains?

Storm drains are systems designed to collect and channel rainwater, preventing flooding in streets and urban areas. These drains are typically located along curbs and roads, allowing water to flow directly into natural bodies of water such as rivers, lakes, or the ocean, without undergoing a treatment process.

Characteristics of storm drains:

Collect rainwater and urban runoff.
Do not process or treat the water before releasing it into bodies of water.
Prevent flooding and water accumulation in streets.

What are sewer drains?

On the other hand, sewer drains are closed systems that transport domestic and industrial wastewater to treatment plants. Unlike storm drains, the water in sewer drains undergoes filtration and decontamination processes before being released into the environment.

Characteristics of sewer drains:

Carry wastewater from homes, businesses, and industries.
Transport water to treatment plants.
Process contaminants before returning water to the ecosystem.

Storm drain vs sewer: What’s the difference?

Both systems play vital roles in urban infrastructure but have key differences:

Feature	Storm drain	Sewer drain
Type of water	Rainwater	Wastewater
Final destination	Natural water bodies	Treatment plant
Filtration process	No	Yes
Contaminants	May carry pollutants into the environment	Treats and removes pollutants

Why is it important to know the difference between storm drains and sewer drains?

Understanding the difference between these systems helps prevent pollution and environmental issues. By avoiding the disposal of trash, oils, or chemicals in storm drains, we reduce contamination in rivers and seas. Additionally, keeping sewer drains free from blockages ensures proper wastewater treatment and prevents overflows.

How to maintain storm drains and sewer drains

Proper storm drain maintenance is crucial to prevent blockages, minimize flooding risks, and ensure efficient water drainage. Regular inspections and cleaning help remove debris, leaves, and pollutants that can accumulate over time. To learn more about the best practices for maintaining these systems, visit our dedicated guide on Storm Drain Maintenance.

Do not dispose of waste in storm drains.
Report blockages or damages to local authorities.
Use grease traps in kitchens to prevent sewer blockages.
Perform regular maintenance on home and business drainage systems.

The importance of responsible water management

Differentiating between storm drains and sewer drains is crucial for the proper management of water in cities and communities. Each system serves a specific function and requires particular care to prevent pollution and ensure environmental well-being.