Progress

Recent Progress: Completed

Pollution-reducing practices were in place by 2017 to achieve 40% of the nitrogen reductions, 87% of the phosphorus reductions and 67% of the sediment reductions necessary to attain applicable water quality standards as compared to the 2009 baseline established by the U.S. Environmental Protection Agency (EPA) as part of the Chesapeake Bay Total Maximum Daily Load (Bay TMDL).

According to the Chesapeake Bay Program’s Watershed Model Phase 5.3.2, pollution controls put in place in the Chesapeake Bay watershed between 2009 and 2017 lowered nitrogen loads 11%, phosphorus loads 21% and sediment loads 10%. Experts attribute this drop in estimated pollution loads to technological upgrades at wastewater treatment plants and the increased implementation of agricultural best management practices (BMPs).

Outlook: Completed

While the Chesapeake Bay Program partnership has exceeded its 2017 pollution reducing targets for phosphorus and sediment, it fell short of its pollution reducing target for nitrogen by 15 million pounds. This outcome was established as a midpoint assessment from the 2009 baseline and the 2025 goal described in the Bay TMDL and these results mark completion of this outcome. Visit the 2025 Watershed Implementation Plan (WIP) Outcome page for our continued progress toward pollution reduction targets for the year 2025.

Modeled Nitrogen Loads to the Chesapeake Bay (1985-2017)

Loads simulated using Watershed Model (Phase 5.3.2) and jurisdiction-reported data on wastewater discharges.

Loading Chart Loading Chart
198520092017Millions of Pounds050100150200250300350400
Agriculture Checked
Agriculture
Urban Runoff Checked
Urban Runoff
Wastewater/Combined Sewer Overflow Checked
Wastewater/Combined Sewer Overflow
Septic Checked
Septic
Forest/Non-Tidal Water Atmospheric Deposition Checked
Forest/Non-Tidal Water Atmospheric Deposition
Atmospheric Deposition to Watershed Checked
Atmospheric Deposition to Watershed
Atmospheric Deposition to Tidal Water Checked
Atmospheric Deposition to Tidal Water

Downloads:

Data (.xlsx) Methods (.pdf)

Modeled Phosphorus Loads to the Chesapeake Bay (1985-2017)

Loads simulated using Watershed Model (Phase 5.3.2) and jurisdiction-reported data on wastewater discharges.

Loading Chart Loading Chart
198520092017Millions of Pounds0246810121416182022242628
Agriculture Checked
Agriculture
Urban Runoff Checked
Urban Runoff
Wastewater/Combined Sewer Overflow Checked
Wastewater/Combined Sewer Overflow
Forest/Non-Tidal Water Atmospheric Deposition Checked
Forest/Non-Tidal Water Atmospheric Deposition

Downloads:

Data (.xlsx) Methods (.pdf)

Modeled Sediment Loads to the Chesapeake Bay (1985-2017)

Loads simulated using Watershed Model (Phase 5.3.2) and jurisdiction-reported data on wastewater discharges.

Loading Chart Loading Chart
198520092017Millions of Pounds01k2k3k4k5k6k7k8k9k10k11k
Agriculture Checked
Agriculture
Urban Runoff Checked
Urban Runoff
Wastewater/Combined Sewer Overflow Checked
Wastewater/Combined Sewer Overflow
Forest Checked
Forest

Downloads:

Data (.xlsx) Methods (.pdf)

The Chesapeake Bay Program’s pollution load estimates were generated using the Watershed Model (Phase 5.3.2) and wastewater discharge data reported by jurisdictions and calibrated using monitoring data. Estimated pollution loads, milestones and targets by jurisdiction and sector are summarized in the table below. More information about pollution loads at the basin and river segment level are available for download.

Chesapeake Bay Watershed

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture113,798,000106,342,00097,647,00088,666,00071,912,000
Urban Runoff39,696,00041,339,00041,172,00033,135,00028,761,000
Wastewater + Combined Sewer Overflow52,179,00033,463,00036,043,00043,585,00037,855,000
Septic8,270,0008,739,0008,573,0007,137,0006,284,000
Forest + Non-Tidal Water Deposition46,155,00045,630,00046,274,00046,705,00047,072,000
Reserve000304,000507,000
EPA: Atmospheric Deposition to Watershed3,050,000790,0001,220,000
EPA: Atmospheric Deposition to Tidal Water19,370,00016,210,0001,660,00015,180,000
Total260,108,000252,514,000229,710,000219,534,000192,391,000

Delaware

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture3,449,0003,145,0002,801,0002,810,0002,384,000
Urban Runoff390,000432,000435,000359,000338,000
Wastewater + Combined Sewer Overflow141,00047,00035,000187,000217,000
Septic155,000179,000177,000121,00098,000
Forest + Non-Tidal Water Deposition340,000328,000329,000349,000354,000
Reserve00000
Total4,474,0004,132,0003,776,0003,824,0003,391,000

District of Columbia

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture00000
Urban Runoff204,000199,000199,000188,000178,000
Wastewater + Combined Sewer Overflow2,657,0001,360,0001,285,0002,363,0002,165,000
Septic02,0002,00000
Forest + Non-Tidal Water Deposition13,00013,00013,00015,00015,000
Reserve0009,00015,000
Total2,877,0001,574,0001,499,1802,575,0002,373,000

Maryland

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture19,764,00017,543,00016,636,00017,018,00015,188,000
Urban Runoff9,533,0009,825,0009,797,0008,178,0007,275,000
Wastewater + Combined Sewer Overflow13,755,00010,888,0009,562,00011,834,00010,553,000
Septic2,972,0002,850,0002,857,0002,300,0001,852,000
Forest + Non-Tidal Water Deposition5,924,0005,794,0005,872,0006,056,0006,143,000
Reserve00095,000159,000
Total51,948,00046,901,00044,725,00045,481,00041,170,000

New York

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture4,536,0004,201,0004,322,0003,638,0003,038,000
Urban Runoff1,241,0001,265,0001,266,0001,181,0001,141,000
Wastewater + Combined Sewer Overflow1,494,0001,849,0001,993,0001,310,0001,187,000
Septic318,000355,000355,000319,000320,000
Forest + Non-Tidal Water Deposition3,131,0003,216,0003,216,0003,150,0003,164,000
Reserve00000
Total10,719,00010,885,00011,152,0009,598,0008,850,000

Pennsylvania

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture62,659,00061,987,00055,667,00046,413,00035,582,000
Urban Runoff17,410,00017,489,00017,406,00013,122,00010,263,000
Wastewater + Combined Sewer Overflow12,137,0006,945,0008,339,00010,207,0008,920,000
Septic2,332,0002,568,0002,405,0001,978,0001,743,000
Forest + Non-Tidal Water Deposition22,097,00022,031,00022,222,00022,332,00022,449,000
Reserve00000
Total116,636,000111,021,000106,039,00094,052,00078,996,000

Virginia

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture20,732,00017,120,00015,840,00016,363,00013,450,000
Urban Runoff10,119,00011,254,00011,200,0009,323,0008,792,000
Wastewater + Combined Sewer Overflow21,730,00012,197,00014,592,00017,438,00014,577,000
Septic2,468,0002,627,0002,619,0002,242,0002,091,000
Forest + Non-Tidal Water Deposition13,079,00012,710,00013,081,00012,239,00013,346,000
Reserve000200,000333,000
Total68,128,00055,908,00057,333,00058,804,00052,588,000

West Virginia

Sector2009 Pollution Loads (Pounds per Year)2017 Pollution Loads (Pounds per Year)2017 Pollution Milestones (Pounds per Year)2017 Interim Targets (Pounds per Year)2025 Planning Targets (Pounds per Year)
Agriculture2,658,0002,347,0002,382,0002,425,0002,271,000
Urban Runoff799,000875,000869,000784,000773,000
Wastewater + Combined Sewer Overflow262,000177,000237,000247,000237,000
Septic174,000158,000159,000178,000181,000
Forest + Non-Tidal Water Deposition1,572,0001,538,0001,541,0001,565,0001,561,000
Reserve000470790
Total5,465,0005,094,0005,188,0005,200,0005,023,790

Jurisdictions describe the steps they will take to reduce pollution and achieve the Bay TMDL allocations in their respective Watershed Implementation Plans (WIPs). Jurisdictions developed and submitted Phase I WIPs in 2010, Phase II WIPs in 2012 and Phase III WIPs in 2019.

Resource availability, location and other factors can influence a jurisdiction’s decision and ability to implement certain practices in certain sectors. A full listing of the practices to which each jurisdiction has committed is available for download. Programmatic milestones are maintained on the websites of each jurisdiction: Delaware, Maryland, New York, Pennsylvania, Virginia, West Virginia and the District of Columbia.

The Chesapeake Bay Program also uses water quality monitoring data to report the partnership’s progress in attaining water quality standards and to examine trends in reducing nitrogen, phosphorus and sediment in the watershed.

Management Strategy

Participating partners described the steps they would take to achieve the 2017 Watershed Implementation Plans (WIPs) outcome in their individual Phase II WIPs. To track the achievement of these outcomes, partners committed to:

  • Collecting, verifying and reporting best management practice data;
  • Evaluating the effectiveness of pollution controls;
  • Enhancing water quality monitoring efforts;
  • Conducting a 2017 Midpoint Assessment; and
  • Adhering to the TMDL Accountability Framework.

Monitoring and assessing progress toward this outcome occurred through the 2017 Midpoint Assessment. This assessment led to enhanced modeling tools that address emerging issues like climate change and future tracking of the necessary pollution reductions will occur through the 2025 WIP outcome.

As part of the Chesapeake Bay Program’s partnership-wide implementation of adaptive management, completion of this outcome was also reviewed and discussed by the Management Board in May of 2018. Please visit the 2025 Watershed Implementation Plan (WIP) Outcome page for future updates.

Logic & Action Plan

Chesapeake Bay Program partners committed to taking a series of specific actions that supported the management approaches listed above. Continuing work to reduce nutrient and sediment loads to achieve applicable water quality standards can be found on the 2025 WIP outcome page.

Participating Partners

The Water Quality Goal Implementation Team led the effort to achieve this outcome. It worked in partnership with the Vital Habitats Goal Implementation Team and the Scientific, Technical Assessment and Reporting Team.

Participating partners included:

  • State of Delaware
  • State of Maryland
  • State of New York
  • Commonwealth of Pennsylvania
  • Commonwealth of Virginia
  • State of West Virginia
  • District of Columbia
  • Chesapeake Bay Commission
  • Natural Resources Conservation Service (U.S. Department of Agriculture)
  • U.S. Army Corps of Engineers
  • U.S. Department of Defense
  • U.S. Department of Homeland Security
  • U.S. Environmental Protection Agency
  • U.S. Geological Survey