Water quality units filter pollutants out of stormwater, releasing the treated water to the drainage system. The structures have limited pollutant storage and require frequent maintenance.
Water Quality Units Flow Graphic
Graphic showing how a water quality unit works. Stormwater flows in to the underground unit through the storm drain pipes. Pollutants such as trash, oils, and sediments are filtered out and stay in the device. Clean water flows through the unit and into the storm water system. There is an overflow structure near the top of the unit. When not maintained, untreated water and pollutants over flow into the storm water system.
Maintenance
Water Quality Stormwater Control Measures Maintenance Companies that inspect and facilitate maintenance for post-construction water quality Stormwater Control Measures. Each company on this list has submitted a signed statement to Metro that states their company will abide by certain practices.
We recommend using a certified Stormwater Control Measure Inspector.
For a list of certified Stormwater Control Measures inspectors, visit Tennessee Stormwater Management.
Checklist for suggested maintenance:
- Are there any noticeable odors on the property?
- Is there any evidence of structural concern (ex. underground structure exposed; lid is not secure)?
- Is the property heavily use?
- When was the last time maintenance was performed
- Contact a professional if maintenance is needed?
- Have I submitted my SCM Annual Report?
File Maintenance Report
File your Annual Inspection and Maintenance Report.
Maintenance Guidance for Approved Water Quality Units
This information is provided as general guidance. Property owners should verify that the guidance provided is appropriate for their unit.
Water Quality Units Properly Maintained
Water Quality Units Improperly Maintained