Science Inventory

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This presentation will discuss the benefits of incorporating the NNI into StreamCat, providing annual time series (1987-2017) of nitrogen and phosphorus inputs, removal by crop harvest, and management relevant metrics for all 2.6 million stream catchments and watersheds across th...

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...

Cyanobacterial harmful algal blooms (cHABs) pose challenges for drinking water treatment plants (DWTPs) in maintaining water quality due to the algal organic matter and cyanotoxins they produce. While standards are upheld using enhanced chemical and physical treatment with increa...

Muskegon Lake is a drowned river-mouth lake designated by the U.S. EPA in 1987 as a Great Lake Area of Concern. All nine of the lake’s beneficial use impairments have been approved for removal, and the region is awaiting final approval from EPA for official delisting. Altho...

Antimicrobial (AMR) research at the EPA has resulted in the publication of  3 new journal articles since Sept. 2024 when this dynamic graphic summary that was last updated.  Major points from these papers include: 1. Microplastic surfaces encourage biofilm formation, enriching a...

Excessive nutrients transported from agricultural fields into the environment are causing environmental and ecological problems. This study uses an integrated multi-media modeling system version 1 (IMMMS 1.0) linking air, land surface, and watershed processes to assess corn grain...

Excess nutrients have long been linked to algal blooms, and significant effort has been made to reduce commonly limiting nutrients, i.e. phosphorus.  Despite significant reductions in Phosphorus loading in the Lake Erie watershed, ~40% reduction, harmful algal blooms (HABs) ...

The Great Lakes are home to an array of unique species which are threatened by the recurring formation of harmful algal blooms (HABs). Freshwater blooms are predominantly caused by cyanobacteria which can directly impact organisms through the release of toxins or indirectly throu...

Cyanobacteria associated with Harmful Algal Blooms (HABs) can release highly potent toxins, known as cyanotoxins, which can be deadly to humans, pets, and livestock. Acute and chronic effects are not well characterized across the diversity of cyanotoxins or the potentially expose...

This is a visual depiction of most, if not all, of the published primary EPA research involving antibiotic resistant bacteria (ARBs) and their genes (ARGs) as well as antibiotics associated with antimicrobial resistance (AMR) in wastewater.  The corresponding list of publication ...

Excess nutrients have long been linked to algal blooms, and significant effort has been made to reduce commonly limiting nutrients, i.e. phosphorus.  Despite significant reductions in Phosphorus loading in the Lake Erie watershed, ~40% reduction, harmful algal blooms (HABs) ...

Anatoxin-a is a neurotoxic alkaloid produced by several species of cyanobacteria, most notably Dolichospermum flos-aquae and the benthic Microcoleus species. Anatoxin-a has been referred to as the very fast death factor due to the remarkably quick onset of symptoms including decr...

Cyanobacteria Harmful Algal Blooms (cHABs) continue to pose a threat to freshwater systems used for drinking water sources, prompting many water treatment plants to seek methods for treating and preventing them. Rapid mitigation of cAHBs using chemical algaecides have been widely...

Presentation to Lake Superior Collaborative April 2022. Overview of GLTED HAB research on L Superior tributraries and nearshore

Nitrogen is an important nutrient for crop yield and quality, but excess nitrogen can leach from fields creating contamination issues in groundwater and surface water supplies. To improve soil nutrient retention, many conservation groups and funding agencies are focused on buildi...

Cyanobacteria associated with Harmful Algal Blooms (HABs) can release toxins known as cyanotoxins, which can be deadly to humans, pets, and livestock. There are U.S. federal and state human health advisory thresholds and recreational and ambient water quality criteria for several...

Background: Saxitoxins (STXs) are a class of algal toxins produced by various species of cyanobacteria and marine dinoflagellates that are a public health concern. Evidence links exposure to STX or one or more of its > 50 analogs through contaminated water or shellfish to adve...

In this document, the Modeling Advisory Group notes that overall, is was impressed with the SFEI science team and the pace of progress on model development, validation, and application. The report notes that model validation is iterative exercise, so the MAG proviedes findings an...

Toxins produced by cyanobacteria are a threat to drinking water and the aquatic ecosystem. Previously, we reported that adding glucose to lake water could reduce cyanobacterial populations. To target the glucose to the euphotic zone, floating HABS-BLOCKS© infused with glucos...

Nitrogen isotopes are frequently used as an indicator of anthropogenic nitrogen loading at the local or regional scale. We were interested in assessing nitrogen isotope response in estuaries across the continental United States. In the summer of 2015, the EPA’s National Coa...

The presence of cyanobacterial harmful algal blooms (cyanoHABs) in freshwater lakes across the United States poses a serious threat to ecosystems and human health. National-scale datasets allow for engagement with broad spatial patterns such as watershed and waterbody specific ch...

Cyanobacteria blooms that produce toxins are a growing concern for water quality and water managers across the United States. Our team uses field data from national surveys of lakes to build models that help us understand the extent, drivers, and risk of toxic blooms for thousand...

 The Harmful Algal Bloom and Hypoxia Research and Control Act (HABHRCA) is to advance the scientific understanding and ability to detect, monitor, assess, and predict HAB and hypoxia events. Cyanobacterial harmful algal blooms (CyanoHABs) produce excessive amounts of cyanoto...

The Environmental Council of the States and the Environmental Research Institute of the States requested EPA’s assistance with early notification of freshwater cyanobacterial Harmful Algal Blooms (cyanoHAB) as one of their priorities. EPA’s cyanoHAB efforts are also mandated in t...

Benthic harmful cyanobacteria blooms (HCBs) pose a significant threat to domestic animals, wildlife, and humans. State, tribal, and local agencies need a greater understanding of and guidelines for addressing the risk posed by benthic HCBs. In 2023, U.S. EPA initiated a three-yea...