NPDES MS4 Permit

The National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) Program is intended to reduce and eliminate pollution from rainfall runoff, which flows through storm drain systems to local streams, ponds, and other waterways.

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About the NPDES MS4 Permit:

In 1972, the United States Environmental Protection Agency first administered the Clean Water Act to protect and restore the chemical, physical, and biological integrity of the Nation’s water resources. Regulating point and nonpoint source pollution, the Act is the foundation by which Federal and state agencies manage water resources. In November 1990, the U.S. EPA issued final regulations requiring National Pollutant Discharge Elimination System Permits (NPDES) for stormwater discharges from municipal separate storm sewer systems and industrial activities. The Maryland Department of the Environment administers this Federal requirement, and Anne Arundel County was among the first of Maryland’s jurisdictions to receive a Phase I NPDES Municipal Separate Storm Sewer System (MS4) permit (issued in 1993).

Within Anne Arundel County, the Department of Public Works is the lead department tasked with ensuring compliance with permit conditions. Permit compliance requires the cooperation of multiple County agencies. These agencies have primary responsibility for successfully implementing the various permit requirements. The Ecological Assessment Program has overall responsibility for administering this permit, interfacing with Federal and State regulators regarding permit compliance, coordinating activities among the responsible County agencies, and reporting permit compliance to MDE on an annual basis.

Annual Reports:

2024 NPDES MS4 Annual Report

2024 NPDES MS4 Annual Report - Cover Letter

MDE Review Comment Letter - coming soon!

Appendix A: Digital Data

 

Appendix B: Legal Authority & Program Documents

 

Appendix C: Illicit Discharge Detection & Elimination (IDDE) Program

 

Appendix D: Good Housekeeping Plans

 

Appendix E: Salt Management Plan

 

Appendix F: Restoration Portfolio

 

Appendix G: Countywide TMDL Stormwater Implementation

 

Appendix H: Assessment of Controls

 

Appendix I: Program Funding and FAP

 

 

Appendix J: Stream Restoration Supplemental Materials

2023 NPDES MS4 Annual Report

2023 NPDES MS4 Annual Report - Cover Letter

MDE Review Comment Letter

Appendix A: Digital Data

Appendix B: Legal Authority & Program Documents

Appendix C: Illicit Discharge Detection & Elimination (IDDE) Program

Appendix D: Restoration BMP Portfolio

Appendix E: Countywide TMDL Stormwater Implementation Plan

Appendix F: Assessment of Controls

Appendix G: Program Funding

2022 NPDES MS4 Annual Report

2022 NPDES MS4 Annual Report - Cover Letter

MDE Review Comment Letter

Appendix A: Geodatabases

Appendix B: Program Documents

Appendix C: Illicit Discharge Detection & Elimination (IDDE) Program

Appendix D: Impervious Area Restoration

Appendix E: Countywide Stormwater TMDL Implementation

Approved TMDL Restoration Plans:

Draft TMDL Restoration Plans:

PCB Source Tracking:

Bacteria Monitoring:

Appendix F: Assessment of Controls

Appendix G: Program Funding

2021 NPDES MS4 Annual Report

2021 NPDES MS4 Annual Report - Cover Letter

Appendix A: Digital Data (including MS4 Geodatabases)

Appendix B: Program Documents

Appendix C: Church Creek and Parole Plaza Monitoring Report

Appendix D: Picture Spring Branch Monitoring Report

Appendix E: Illicit Discharge Detection & Elimination (IDDE) Report

Appendix F: Litter and Floatables Comprehensive Plan

Appendix G: Property Management

Bureau of Utilities:

Bureau of Waste Management Services:

Bureau of Highways:

Appendix H: Countywide TMDL Stormwater Restoration Plans

Approved TMDL Restoration Plans:

NEW Draft TMDL Restoration Plans:

PCB Source Tracking:

Appendix I: FY2021 Financial Assurance Plan and Report

2020 NPDES MS4 Annual Report

2020 NPDES MS4 Annual Report - Cover Letter

Appendix A: Digital Data (including MS4 Geodatabases)

Appendix B: Stormwater Management Program

Appendix C: Church Creek and Parole Plaza Monitoring Report

Appendix D: Picture Spring Branch Monitoring Report

Appendix E: IDDE Report

Appendix F: Litter and Floatables Comprehensive Plan

Appendix G: Property Management
Bureau of Utilities:

Annapolis Water Reclamation Facility

Anne Arundel Utilities Operations Center

Broadneck Water Reclamation Facility

Broadwater Water Reclamation Facility

Cox Creek Water Reclamation Facility

Maryland City Water Reclamation Facility

Patuxent Water Reclamation Facility

Piney Orchard Water Reclamation Facility

Bureau of Waste Management Services:
Millersville Landfill and Resource Recovery Facility

Northern Recycling Center

Southern Recycling Center

Bureau of Highways:
Central District Roads Yards

Northern District Roads Yards

Southern District Roads Yards

Appendix H: Oyster Aquaculture Credits

Appendix I: Restoration Plans and TMDLs

Appendix J: FY2020 Financial Assurance Plan

Appendix K: Program Funding

2019 NPDES MS4 Annual Report

2019 NPDES MS4 Annual Report - Cover Letter

MDE Response Letter

Appendix A: Digital Data (including MS4 Geodatabases)

Appendix B: Legal Authority

Appendix C: Church Creek and Parole Plaza Monitoring Report

Appendix D: Picture Spring Branch Monitoring Report

Appendix E: IDDE Report

Appendix F: Litter and Floatables Comprehensive Plan

Appendix G: Property Management

Bureau of Utilities:

Annapolis Water Reclamation Facility

Anne Arundel Utilities Operations Center

Broadneck Water Reclamation Facility

Broadwater Water Reclamation Facility

Cox Creek Water Reclamation Facility

Maryland City Water Reclamation Facility

Patuxent Water Reclamation Facility

Bureau of Waste Management Services:

Millersville Landfill and Resource Recovery Facility

Northern Recycling Center

Southern Recycling Center

Bureau of Highways:
Central District Roads Yards

Northern District Roads Yards

Southern District Roads Yards

Appendix H: Restoration Plans

Appendix I: Nutrient Trading

Appendix J: FY18 Financial Assurance Plan

Appendix K: Program Funding

2018 NPDES MS4 Annual Report

Appendix A

Appendix B

Appendix C

Appendix D

Appendix E

Appendix F

Appendix G

Bureau of Utilities:
Annapolis Water Reclamation Facility

Anne Arundel Utilities Operations Center

Broadneck Water Reclamation Facility

Broadwater Water Reclamation Facility

Cox Creek Water Reclamation Facility

Maryland City Water Reclamation Facility

Patuxent Water Reclamation Facility

Bureau of Waste Management:

Millersville Landfill and Resource Recovery Facility

Northern Recycling Center

Southern Recycling Center

Bureau of Highways:
Central District Roads Yards

Northern District Roads Yards

Southern District Roads Yards

Appendix H

Impervious Surface - May 26, 2015

Maps

Tables

2018 Baseline Impervious  Geodatabase

MDE Memorandum on CBP Protocol

Appendix I

Appendix J

 

2017 NPDES MS4 Annual Report

Appendix A

Appendix B

Appendix C

Appendix D

Appendix E

Appendix F

Appendix G

Appendix H

Annapolis Water Reclamation Facility

Anne Arundel Utilities Operations Center and Maintenance Yard

Broadneck Water Reclamation Facility

Broadwater Water Reclamation Facility

Cox Creek Water Reclamation Facility

Maryland City Water Reclamation Facility

Millersville Landfill and Resource Recovery Facility

Northern Recycling Center

Patuxent Water Reclamation Facility

Southern Recycling Center

Appendix I

Appendix J

Appendix K

BWPR Restoration Project Goals

(Number of projects completed/anticipated)

Stream & Shoreline Restoration

Stormwater Management

Outfall Stablization

BWPR MS4 Attainment Goals

(acres to date/projected acres)

5th Generation MS4 Permit Progress Tracking