Annual Reports 

Annually, Harford County is required to submit a program summary to Maryland Department of the Environment or MDE. The summary outlines the County’s progress towards improving the health of local streams and Chesapeake Bay.

Pages from FY2025 Annual Report

These programs are required under the National Pollutant Discharge Elimination System or NPDES program through the Environmental Protection Agency or EPA. The NPDES program requires counties and municipalities nationwide to apply for a permit that regulates local stream health or water quality. These permits are called (M)unicipal (S)eparate (S)torm (S)ewer (S)ystem or MS4 permits

Links to the County's most recent Annual Report are listed below:

Report 

2025 Annual MS4 Report

Appendices 

Appendix A - Permit Administration

Appendix B - Legal Authority

Appendix C1 - Source Identification (Storm Drain System)

Appendix C2 - Source Identification (Industrial and Commercial Properties)

Appendix C3 Source Identification (Urban Best Management Practices)

Appendix C4 - Source Identification (Impervious Surfaces)

Appendix C5 - Source Identification (Monitoring Locations)

Appendix C6 - Source Identification (Watershed Quality Improvement Projects)

Appendix D1 - Management Programs (Stormwater Management)

Appendix D2 - Management Programs (Erosion Sediment Control)

Appendix D3 - Management Programs (Illicit Discharge and Elimination)

Appendix D4 - Management Programs (Property Management and Maintenance)

Appendix D5 - Management Programs (Public Education)

Appendix E1 - Stormwater Restoration (Credits)

Appendix E2 - Stormwater Restoration (Restoration Inspections)

Appendix E3 - Stormwater Restoration (Restoration Monitoring)

Appendix F - Countywide TMDL Stormwater Implementation Plan

Appendix G1 - Assessment of Controls (BMP Effectiveness Monitoring)

Appendix G2 - Assessment of Controls (Watershed Assessment Monitoring)

Appendix G3 - Assessment of Controls (PCB Source Tracking)

Appendix H - Program Funding