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Total Maximum Daily Load (TMDL) 2018

Authors: Pennsylvania Department of Environmental Protection
Owners: Delaware River Watershed Initiative
Resource type:Composite Resource
Created:Nov 17, 2018 at 6:25 p.m.
Last updated: Nov 17, 2018 at 6:25 p.m. by Delaware River Watershed Initiative


The Clean Water Act Section 303(d) establishes the Total Maximum Daily Load (TMDL) program. The purpose of the TMDL program is to identify sources of pollution and allocate pollutant loads in places where water quality goals are not being achieved. This layer shows the list of waters for which technology-based or other required pollution controls are not stringent enough to meet water quality standards. The TMDLs themselves specify a pollutant budget that must be achieved to meet state water quality standards and allocates pollutant loads among pollution sources in a watershed, e.g., point and nonpoint sources.
TMDLs can be developed for several categories such as: point sources (permitted sewage and industrial discharges); nonpoint sources (agriculture and urban runoff); lakes; abandoned mine drainage (also called acid mine drainage or AMD); specific bioaccumulative chemicals (PCBs and chlordane that contaminate fish, resulting in fish advisories limiting or banning the number of fish that a person can safely consume); and complex situations (combinations of different types).
This layer is based on the High Resolution National Hydrography Dataset (NHD). The Lake TMDLs are not included in this layer.

This data is hosted at, and may be downloaded or accessed from PASDA, the Pennsylvania Spatial Data Access Geospatial Data Clearinghouse http://www.pasda.psu.edu/uci/DataSummary.aspx?dataset=1130

Subject Keywords

nhd,creek,stream,tmdl,surface,rivers,attain,national hydrography dataset,tmdls,category 5,303d,attaining,assessment,total maximum daily load,waters,303,water,non attaining,assessments,inlandwaters,hydrology,designated use,pollutant loads,streams,creeks,river

How to cite

Pennsylvania Department of Environmental Protection (2018). Total Maximum Daily Load (TMDL) 2018, HydroShare, http://www.hydroshare.org/resource/f4e1fe203ce448d181afe2c8de2eecf8

This resource is shared under the Creative Commons Attribution CC BY.


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  • Sharable Resource  Shareable



 Coordinate System/Geographic Projection:  WGS 84 EPSG:4326
 Coordinate Units:  Decimal degrees
North Latitude
East Longitude
South Latitude
West Longitude


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Name Organization Address Phone Author Identifiers
Pennsylvania Department of Environmental Protection


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