September 3, 2025

LAND DEVELOPMENT SERVICES

Letters to Industry

Revised 3^rd Party Construction Inspection Checklists and Certifications

The Land Development Services (LDS) Site Development and Inspections Division (SDID) has updated the following 3^rd Party construction inspection checklists and certifications for various stormwater controls. The checklist contents have been updated to reflect the new Department of Environmental Quality (DEQ) specification references and to incorporate minor editorial changes. The updated checklists include:

• 3rd Party Inspection Checklist - P-BAS-01 Constructed Wetland
• 3rd Party Inspection Checklist - P-BAS-02 Wet Pond
• 3rd Party Inspection Checklist - P-BAS-03 Extended Detention Pond  
• 3rd Party Inspection Checklist - P-BAS-04 Rainwater Harvesting
• 3rd Party Inspection Checklist - P-CNV-01 Grass Channel  
• 3rd Party Inspection Checklist - P-CNV-02 Dry Swales
• 3rd Party Inspection Checklist - P-CNV-03 Wet Swale
• 3rd Party Inspection Checklist - P-FIL-01 Rooftop Disconnect  
• 3rd Party Inspection Checklist - P-FIL-02 Vegetated Roof
• 3rd Party Inspection Checklist - P-FIL-03 Permeable Pavement  
• 3rd Party Inspection Checklist - P-FIL-04 Infiltration Practices  
• 3rd Party Inspection Checklist - P-FIL-05 Bioretention  
• 3rd Party Inspection Checklist - P-FIL-06 Filtering Practices  
• 3rd Party Inspection Checklist - P-FIL-07 Sheet Flow
• 3rd Party Inspection Checklist - P-FIL-08 Soil Compost Amendment
• 3rd Party Inspection Checklist - MTD-F Filtering manufactured devices
• 3rd Party Inspection Checklist - MTD-H hydrodynamic manufactured devices
• 3rd Party Checklist- Underground Detention (Detention Only)

The 3^rd Party Construction Inspection Checklists and Certifications for BMP inspection are required for each BMP/stormwater facility constructed per the approved plan. Copies of updated checklists are available at the LDS Forms and Publication Library. The revised checklists may be used immediately but are required for all submissions made on or after October 1, 2025.

If you have any questions, please contact the Site Development and Inspections Division at 703-324-1720, TTY 711.