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Environmental Protection and Sustainability
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National Pollution Discharge Elimination System (NPDES)

Runoff from rain is regulated under the NPDES permit program.

Runoff from rain storms
carries pollution to local
streams.

The National Pollution Discharge Elimination System (NPDES) program requires urban jurisdictions, such as Baltimore County, to have a discharge permit for their storm drain pipes. This is similar to the end-of-pipe restrictions with which industries or wastewater treatment plants must comply. These permit requirements are coordinated by the NPDES Management Committee. Related State and Federal resources are regularly referred to for program updates and meeting presentations are additional resources.

Storm drain systems are designed primarily to move stormwater, i.e. rain water, away from developed areas as quickly as possible to prevent flooding. These developed areas are also referred to as impervious surfaces and are places that prevent rain from soaking back into the ground e.g. roads, rooftops and parking lots. The result is an increase in stormwater runoff.

Stormwater runoff is now recognized as a major transporter of excess nitrogen, phosphorous and sediment generated within our urban communities. These pollutants come from a multitude of sources such as livestock and pet waste, chemicals leaked from cars and fertilizers on our lawns.

Baltimore County prepares an annual report of stormwater-related programs and projects targeted to reduce water quality pollution. This report has valuable data and information related to the monitoring and management of our watersheds. View and download either the entire or chapters of the 2012 NPDES Annual Report on the links below. Past reports are also available in the archive.

2013 NPDES Annual Report

View and download individual sections of the 2013 NPDES Annual Report.

Contact Information

Watershed Management and Monitoring
Phone: 410-887-5683
Fax: 410-887-4804
Email: watersheds@baltimorecountymd.gov

Revised February 11, 2014

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