These EPA data provide information about the nutrient-related Clean Water Act Section 319 projects currently underway that have reported on load reductions for nutrients. Active projects do not include those that are marked as discontinued, never initiated, completed, or accepted by EPA. Nutrients include the following pollutants: algal growth/chlorophyll, ammonia, Biochemical Oxygen Demand (BOD), dissolved oxygen (low), nitrate, nitrogen, nutrients, phosphorus, sedimentation-siltation, suspended solids, Total Kjeldahl Nitrogen, and phosphate.
A web-based data layer in EPA NPDAT Tool. This layer provides information on nitrogen and phosphorus discharges from 2010 facility monitoring reports with corresponding nitrogen and phosphorus limits from EPA's Discharge Monitoring Report (DMR) Pollutant Loading Tool
These values, derived from EPA's NARS provide nitrogen and phosphorus pollutant levels statistically associated with degraded biological condition and may indicate the potential for biological community impacts at or near a monitoring site. Values for streams and for lakes to TN and TP.
These USGS data (2006) provide a comprehensive look at land use. This layer provides states with an estimated breakdown of the percentage of distinct forms of developed (urban), crop and pastureland (agricultural), and forest lands, and will help states focus the right practices on the land in prioritized watersheds.
EPA data indicate locations of agricultural operations where animals are kept and raised in confined situations. CAFOs generally congregate animals, feed, manure and urine, dead animals, and production operations on a small land area. Feed is brought to the animals rather than the animals grazing or otherwise seeking feed in pastures, fields, or on rangeland. Animal waste and wastewater can enter waterbodies from spills or breaks of waste storage structures (due to accidents or excessive rain), and non-agricultural application of manure to crop land.
SPARROW (short for SPAtially Referenced Regressions On Watershed attributes) — This GIS-based watershed model integrates statistical and mechanistic modeling approaches to simulate long-term mean annual stream nutrient loads as a function of a wide range of known sources and climatic (precipitation, temperature), landscape (e.g., soils, geology), and aquatic factors affecting nutrient fate and transport. SPARROW TN and TP loadings (yields) for major basins, N incremental and P incremental 2002; and Mississippi Basin Incremental and Delivered Incremental for N and P for 1992.
The U.S. Geological Survey's (USGS) National Water Information System (NWIS) is a comprehensive and distributed application that supports the acquisition, processing, and long-term storage of water data. NWISWeb serves as the publicly available portal to a geographically seamless set of much of the water data maintained within NWIS.
These EPA data identify water-quality limited segments (i.e., waters that will not meet water quality standards for a particular pollutant even after a technology-based permit is in place). Section 303(d) nutrient-related impaired waters for which geospatial data are available can be displayed through the geospatial viewer. A one-time snapshot of all section 303(d) nutrient-related impaired waters, not just those for which geospatial data are available, for each state is also provided as a data download. For purposes of identifying nutrient-related impairments, EPA used the following national impairment categories: algal growth, ammonia, noxious aquatic plants, nutrients, organic enrichment/oxygen depletion.
These EPA data include nutrient-related impaired waters for which a TMDL has been developed. Waters with TMDLs for nutrient-related impairments for which geospatial data are available can be displayed through the geospatial viewer. A one-time snapshot of all waters with TMDLs for nutrient-related impairments, not just those for which geospatial data are available, for each state is also provided as a data download. For purposes of identifying nutrient-related TMDLs, EPA used the following national impairment categories: algal growth, ammonia, noxious aquatic plants, nutrients, organic enrichment/oxygen depletion.
USEPA issued a memo March 2011, memorializing EPA’s commitment to partner with states and collaborating stake holders to accelerate the reduction of nitrogen and phosphorus loadings to our nation’s waters. EPA recognizes that the best framework approaches entail states, federal agencies, conservation districts, private landowners and other stakeholders working collaboratively to develop watershed-scale plans that target the most effective practices to the acres that need it most. We also encourage federal and state agencies to work with NGOs and private sector partners to leverage resources and target those resources where they will yield the greatest outcomes. Where states are willing to step forward, EPA is encouraging progress on nutrient frameworks through on the ground technical assistance and/or dialogue with state officials and stake holders, coupled with cooperative efforts with other agencies.