Science Inventory

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US EPA previously released two static versions of the River Basin Export Reduction Optimization Support Tool (RBEROST), one version for the Upper Connecticut River basin (v1s), and one for the Puget Sound Basin (v2s).  RBEROST is designed to enable stakeholders to identify t...

Wetland restoration can be an effective tool in nutrient reduction strategies. However, to be effective as a strategy, restored wetlands must be geographically positioned where (1) soil and hydrologic conditions promote wetland persistence post-restoration and (2) interception of...

While states and local communities have made progress in decreasing nitrogen and phosphorus pollution to waterways, nutrient pollution continues to cost billions of dollars every year via mitigative expenses like drinking water treatment or revenue losses tied to decreased touris...

Wetlands are effective in reducing nutrient loads in surface waters, but there is a need to optimize allocation of conservation efforts to efficiently maximize the likelihood of water quality improvements. This presentation describes efforts to quantify nutrients flowing through ...

Nutrient pollution and cyanobacteria harmful algal blooms (cyanoHABs) are critical challenges shared among surface waters, largely driven by nutrient releases from nonpoint sources. Tools that inform the selection of nutrient source control and/or timing of implementation would f...

The National Nutrient Inventory (NNI) provides estimates of major nutrient fluxes within the contiguous US. This presentation will highlight key features of the NNI, describe major insights into nutrient pollution trends, and introduce a suite of related water quality modeling pr...

Nitrogen is essential in sustaining estuarine ecosystems, particularly lower trophic levels and filter-feeding organisms. However, excess nitrogen is an often-cited cause of coastal ecosystem decline. One of the largest sources of nitrogen in Narragansett Bay, RI, is effluent fro...

Wetlands provide numerous ecosystem functions within their connected landscapes that improve water quality, including nutrient removal. Due to growing recognition of the role of wetlands in maintaining downstream water quality, there is an increasing emphasis on identifying exist...

Publication of EPA’s Nutrient Inventory is a critical step towards thorough mapping and accounting of sources of N and P to US landscapes. However, summaries of nutrients within accumulative watersheds are needed to develop accurate watershed-level nutrient budgets and rela...

Watershed nutrient metrics are crucial components of state-led efforts to improve nutrient reduction strategies, however, they are challenging to assemble across the scales management and research require. Therefore, we downscaled and dasymetrically allocated the EPA’s NextGen Na...

Wetlands provide numerous ecosystem functions within their connected landscapes that improve water quality, including nutrient removal. Broad-scale loss of wetlands has removed landscape buffers to sources of nonpoint source pollution, such as nutrient-laden agricultural runoff, ...

Wetlands provide critical ecosystem services by intercepting and retaining excess non-point nitrogen (N) inputs moving through the environment. However, not all wetlands have the same capacity to store and remove N via denitrification, plant uptake, or storage in soil organic mat...

Harmful algal blooms of cyanobacteria (cyanoHABs) affect more fresh waterbodies now than historically experienced. The greatest driver of cyanoHAB formation is nutrient pollution. Nutrient pollution can come from sources external to the waterbody (e.g., overland runoff, stream lo...

EPA’s River Basin Export Reduction Optimization Support Tool (RBEROST) is designed to identify least-cost management solutions to meet loading targets for nitrogen and phosphorus across large river basins, considering multiple approaches: wastewater treatment plant upgrades, stor...

Wetlands provide critical ecosystem services by intercepting and retaining excess non-point nitrogen (N) inputs moving through the environment. However, not all wetlands have the same capacity to store and remove N via denitrification, plant uptake, or storage in soil organic mat...

Targeted conservation approaches seek to focus resources on areas where they can deliver the greatest benefits and are recognized as key to reducing nonpoint source nutrients from agricultural landscapes into sensitive receiving waters. Moreover, there is growing recognition of t...

This presentation will review the latest research on inputs, budgets, effects, legacies and management related to non-point source nutrient pollution.  Using examples of nitrogen and phosphorus budgets at the national, regional and local scales, Jana Compton from EPA’s...

Freshwater inflow drives environmental conditions and subsequently ecological function of estuaries. The quantity, quality, and timing of freshwater inputs are derived from the interaction of climatic drivers occurring over a mosaic of different land uses within watersheds feedin...

Wetlands provide numerous ecosystem functions within their connected landscapes, including nutrient filtering that improves water quality. Broad-scale loss of wetlands has removed landscape buffers to sources of nonpoint source pollution, such as nutrient-laden agricultural runof...

The Region 10 ROAR project, "Saving Puget Sound from Eutrophication (SPSE): Coupling River Basin Export Reduction Optimization Support Tool (RBEROST) with Dynamic SPARROW model", builds upon ongoing work in ORD's Nutrient and Harmful Algal Bloom research programs. ...

The River Basin Export Optimization Support Tool (RBEROST) enables stakeholders to determine least cost solution to meet nutrient loading targets for both inland and downstream receiving waters by applying wastewater treatment plant upgrades, septic upgrades, septic to sewer conv...

We modeled nutrient management practices including residue management, cover crops, filter strips, grassed waterways, constructed wetlands, and reducing fertilizer in the upper East Fork of the Little Miami River, an 892 km2 watershed in southwestern Ohio, USA. The watershed is 6...

To assess the consequences of nutrient reduction strategies on water quality under climate change, we investigated the long-term dynamics of dissolved oxygen (DO) and pH in Narragansett Bay (NB), a warming urbanized estuary in Rhode Island, where nitrogen loads have declined due ...

Reduction of total phosphorus (TP) loads has long been a management focus of Chesapeake Bay restoration, but riverine monitoring stations have shown mixed temporal trends. To better understand the regional patterns and drivers of TP trends across the Bay watershed, we compiled an...

  The negative effects of nutrient pollution in streams, rivers, and downstream waterbodies remain widespread global problems. Understanding the cost-effectiveness of different strategies for mitigating nutrient pollution is critical to making informed decisions and definin...