BMP Inspection and Maintenance


A key component of sustainable stormwater management is ensuring that the practices we are claiming for pollutant reduction credit in the Bay actually exist, are working as intended, and are maintained properly over their design life. Without sufficient inspection and maintenance procedures, practices are not only likely to suffer from reduced water quality function, but can also lose their other community benefits.

Visual inspections are rapid investigations that use simple indicators to determine whether a practice is still functioning as intended and can be piggy-backed as part of routine stormwater BMP inspections required under local MS4 permits.

If the field inspection indicates that a BMP is not performing to its original design, the locality would have the opportunity to take corrective maintenance or rehabilitation actions to bring it back into compliance.

For more information on visual indicators and to review other CSN inspection and maintenance resources, see below:


Final Recommended Guidance for Urban Stormwater BMP Verification

This memo describes how the work group developed guidance to verify the performance of urban BMPs in the Bay watershed.

Version august 11, 2014 | Size (637 KB) | File type (.pdf) | Download

Strengthening Verification of Best Management Practices Implemented in the Chesapeake Bay Watershed: A Basinwide Framework

Report and Documentation from the Chesapeake Bay Program Water Quality Goal Implementation Team’s BMP Verification Committee

Version october 2014 | Size (39 MB) | File type (.pdf) | Download

The Pond Protocol Document

The pond protocol emphasizes simple visual indicators to rapidly assess dam safety and water quality functions and determine if critical repairs are needed to maintain them.

Version october 20, 2016 | Size (1 MB) | File type (.pdf) | Download


Listen to our archived webcasts on urban BMP inspection, maintenance and verification here:

[Webcast] TRUST BUT VERIFY: Urban BMP Verification in the Chesapeake Bay

[Webcast] Inspecting, Maintaining and Verifying LID Practices

[Webcast] Bioretention Maintenance: In the Trenches

[Webcast] Visual Indicators for Infiltration, Surface Sand Filters and Permeable Pavement

[Webcast] Visual Indicators Part II: Filter Strips and Grass Channels

[Webcast] The Pond Protocol