Maps provide a unique way to explore a particular topic. The maps in this gallery were developed by the Department for use in Water Quality Protection, Restoration and Advisories.
Designated Use Classifications
This map displays the designated use classes assigned to Maryland's surface waters as promulgated in Code of Maryland Regulations Section 26.08.02.08. Maryland classifies surface water bodies according to use classes which describe the suite of specific designated uses for that water body.
Water Quality Assessments
This interactive map displays surface water quality assessment information found in Maryland’s 2018 Integrated Report of Surface Water Quality (IR). Assessments have been made for a variety of water body types and show both good water quality and impairments.
These maps display watersheds where TMDLs have been developed.
Maryland 319(h) Program Projects
Learn how Maryland is reducing nonpoint source pollution with an interactive application highlighting Maryland’s 319(h) Nonpoint Source Program under the Clean Water Act. Navigate the story map to learn more about 319(h) funded projects that provide measurable improvements in water quality and habitat.
StormwaterPrint is a Geographic Information System (GIS) application developed by the Maryland Department of the Environment (MDE) in support of the MD iMap initiative. It highlights the efforts being undertaken by the State and county and municipal stormwater management programs to control urban water pollution. The aim is to provide planners, government authorities, and the public with critical data and analyses that will help with decision-making and provide public outreach.