How Often Do Catch Basins Need to Be Cleaned, and How Do I Clean Them?

When it comes to effective stormwater management, catch basins play a crucial role. These familiar grated inlets, found along curbs, in parking lots, and at low points across commercial and industrial sites, are the first line of defense against flooding and pollutants entering our waterways. But how often should catch basins be cleaned—and what’s the right way to do it? The experts at Accena SWPPP Services are here to answer your questions.

What Is a Catch Basin, and Why Does It Need Maintenance?

A catch basin is an underground chamber, typically covered by a grate, designed to “catch” debris, trash, leaves, and sediment from stormwater runoff before the water flows into the storm drain system. Over time, these materials can accumulate and reduce the catch basin’s efficiency or cause blockages that can lead to localized flooding or environmental contamination.

How Often Should Catch Basins Be Cleaned?

The general rule of thumb is to clean catch basins at least once a year, but several factors can mean more frequent maintenance is needed:

• High-traffic or industrial areas tend to accumulate debris faster.

• Locations with lots of trees may see more leaf and organic buildup, especially in the fall.

• Regions with heavy rainfall might require additional cleanings to ensure proper drainage.

• Local regulations or permits may require specific maintenance schedules as part of your Stormwater Pollution Prevention Plan (SWPPP).

Inspections should be performed regularly (quarterly or after major storms). A key sign that cleaning is required is when debris or sediment fills about one-third of the catch basin’s depth.

Step-by-Step: How to Clean a Catch Basin

1. Safety First:Always wear appropriate personal protective equipment (PPE) including gloves, eye protection, and possibly a mask. If working in a busy area, use safety cones or signage.

2. Remove the Grate:Carefully lift the catch basin grate using proper tools, as these can be very heavy.

3. Inspect the Basin:Check the depth of sediment and identify any unusual materials or issues (such as standing water, strong odors, or visible blockages).

4. Remove Debris:Use a shovel, scoop, or bucket to remove debris and sediment. In larger or deeper catch basins, professional vacuum trucks (hydro-vacs) are often used to efficiently remove material. Place all debris in appropriate containers for proper disposal—never wash it down the drain.

5. Rinse and Recheck:If necessary, rinse the basin gently to loosen compacted material, then remove any additional sediment.

6. Replace the Grate:Securely place the grate back on the basin to prevent accidents or unauthorized entry.

7. Record Keeping:Log the cleaning date, observed conditions, and any maintenance performed. Good record-keeping helps ensure regulatory compliance and future maintenance planning.

Why Professional Help Matters

While routine visual inspections and surface debris removal can be handled in-house, professional cleaning is recommended for deep or large catch basins, or where hazardous materials are present. Accena SWPPP Services has the tools, training, and expertise necessary to keep your stormwater systems in top condition, while ensuring compliance with local and federal regulations.

Protect Your Property—and the Environment

Regular catch basin cleaning prevents flooding, protects infrastructure, and reduces the risk of stormwater pollution. Consistent maintenance is a critical part of any effective SWPPP program and helps preserve our local waterways for future generations.

Need help with stormwater maintenance? Contact Accena SWPPP Services today for a free assessment or to schedule your next catch basin cleaning. Let us help you keep your site—and your community—clean, compliant, and resilient.