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Chesapeake Bay TMDL

What is a TMDL?

By definition, a Total Maximum Daily Load (TMDL) is an estimate of the maximum amount of an impairing substance or stressor (pollutant) that a waterbody can assimilate without violating water quality standards. The total load includes pollutants from pipes, called point sources, and stormwater runoff and groundwater flow called non-point sources. A "margin of safety" is also included in the total load to account for the uncertainties. Additional information can be found a

Why should Anne Arundel County be Concerned About TMDLs?

Based on the federal government’s Clean Water Act, all states are required to consider the development of TMDLs for waterbodies that do not meet water quality standards for various pollutants. All of the twelve major waterbodies in Anne Arundel County are impaired by two or more substances (e.g., nutrients, sediments, fecal coliform bacteria, toxics, biological, or metals). The Watershed Assessment and Planning program is continuously monitoring the state of TMDL development and water quality analyses to justify the delisting of waterbodies from the MDE 303(d) impairment list.

Anne Arundel County - Phase II WIP (Watershed Implementation Plan)

Anne Arundel County's Category 5 303(d) Waters and TMDLs

TMDL Restoration Plans

Total Maximum Daily Load Restoration Plan for Bacteria - Final Plan

Baltimore Harbor Watershed Nutrient TMDL Restoration Plan - Draft

Little Patuxent River Sediment TMDL Restoration Plan - Draft

Patapsco River Lower North Branch Sediment TMDL Restoration Plan - Draft

Upper Patuxent River Sediment TMDL Restoration Plan - Draft

Progress Reports

Below are Programmatic and Implementation progress reports as required by the Maryland Department of the Environment. Programmatic Milestones are commitments to non-project improvements such as organizational, process, and capacity building changes that position Anne Arundel County to implement it's WIP. Implementation Milestones are commitments to on-the-ground activities that result in nutrient and sediment load reductions.

Programmatic Two-Year Milestones INTERIM Progress Report - Reporting Period - January 1, 2016 – December 31, 2016 - (Submitted to MDE on 1/27/17)

Implementation Two-Year Milestones INTERIM Progress Report - Progress Achieved - July 1, 2015 – June 30, 2016 - (Submitted to MDE on 1/27/17)

Programmatic Two-Year Milestones FINAL Progress Report - Reporting Period - January 1, 2014 - December 31, 2015 - (Submitted to MDE on 1/29/16)

Implementation Two-Year Milestones FINAL Progress Report - Reporting Period - January 1, 2013 - June 30, 2015 - (Submitted to MDE on 1/29/16)

Programmatic Milestones FINAL Report - Reporting Period - January 1, 2012 to December 31, 2013 - (Submitted to MDE on 1/31/14)

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