Science Inventory

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Nitrogen management in Long Island Sound (LIS) has reduced N loading and the extent of hypoxia over the last 2 decades. To support communication around successful remediation of hypoxia and the remaining challenges of N management, we are analyzing 30 years of water quality data ...

Onsite wastewater treatment systems are a major source of excess nutrients and co-pollutants in groundwater. The high density of septic systems in New England&rsquo;s coastal watersheds has degraded the quality of drinking and recreational freshwater resources and led to collapse...

Air pollution is a global environmental and public health issue. Exposure to air pollution is associated with elevated risk of morbidity and mortality from respiratory, cardiovascular, and neurological diseases. Following exposure to air pollution, the lung and other organ system...

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...

EPA-ORD-CPHEA's Michael Pennino and Jana Compton were invited to present on groundwater nitrate at the EPA Region 5 State Water Directors Meeting on May 15, 2024.&nbsp; This meeting brings together EPA Region 5 state clean water and drinking water directors to discuss topics of c...

Harmful cyanobacterial blooms are becoming more common and persistent around the world. When in bloom, various cyanobacterial strains can produce anatoxins in high concentrations, which, unlike other cyanobacterial toxins, may be present in clear water. Potential human and animal...

The integrated forest ecosystem model ForSAFE-Veg was used to simulate soil processes and understory vegetation composition at three&mdash;sugar maple, beech, yellow birch&mdash;hardwood forest sites in the Northeastern United States (one at Hubbard Brook, NH, and two at Bear Bro...

This is a presentation to the Water Treatment Interagency Working Group and is a summary of EPA/ORDs water sensor research effort, focusing on drinking water applications.&nbsp;

Water quality standards are important for protecting and restoring the condition of lakes, rivers, estuaries, and other water bodies in the United States. Given that nutrient pollution continues to be a widespread problem in aquatic systems, the development of numeric nutrient cr...

Excess nutrients (nitrogen and phosphorus) in lakes can lead to eutrophication, hypoxia, and algal blooms that may harm aquatic life and people.&nbsp;&nbsp;Some U.S. states have established numeric water quality criteria for nutrients to protect surface waters.&nbsp;&nbsp;However...

The content covers the validation of the NASA TEMPO mission with direct sun and multi-axis retrievals of NO2 and formaldehyde trace gas vertical column products from the Pandonia Global Network. The slides present nuances in the strengths and weakness of Pandonia Global Network d...

In July 2023, the US Environmental Protection Agency (EPA) hosted a workshop bringing together experts to discuss air sensor quality assurance (QA). This workshop focused on particulate matter (PM) sensors, fenceline and near-source community volatile organic compound (VOC) senso...

As the development and use of air sensors continues to expand, understanding the performance of sensors remains a critical need given the variability in sensor data quality. To help support consumers and developers of air sensor technologies, the U.S. Environmental Protection Age...

Historical deposition of nitrogen (N) and sulfur (S) over the Eastern United States has impacted ecosystem structure and function. The potential for recovery of ecosystems is relatively uncertain, with deposition paired with future climate change contributing to this uncertainty....

Stream macroinvertebrate assemblages are shaped by natural and human-related factors that operate through complex hierarchical pathways. Quantifying these relationships can support stream ecological assessment. We applied a structural equation modeling framework to evaluate hypot...

Difficulty in diatom species identification and nomenclature can lead to major inconsistencies in taxonomic datasets. These inconsistencies may hinder the use of diatoms in large-extent bioassessments such as the U.S. Environmental Protection Agency&rsquo;s (U.S. EPA) National Aq...

This Estuary Data Mapper product provides a summary of changes in the maximum extent of seagrass in estuaries of the Eastern and Gulf Coasts of the United States, compiled from multiple sources into a common format. Data were formatted to be consistent with datasets compiled in 2...

&nbsp; 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...

Phosphorus causes nutrient pollution in lentic water systems, which act as a reservoir of phosphorus since it is stored within the sediments of these waterbodies. The effects of phosphorus pollution include harmful algal bloom events, hypoxia of waterbodies, and impairment of dri...

This presentation will cover recent research on nutrient inputs, agricultural management and nitrate concentrations in soil solution and groundwater in the southern Willamette Basin&rsquo;s Groundwater Management Area (GWMA).&nbsp;Non-point sources are the predominant inputs of n...

A substantial fraction of nitrogen (N) fertilizer applied in agricultural systems is notincorporated into crops and moves below the rooting zone as nitrate (NO3&minus;). Under-standing mechanisms for soil N retention below the rooting zone and leaching togroundwater is essential ...

Along urban streams and rivers, various processes, including road salt application, sewage leaks, and weathering of the built environment, contribute to novel chemical cocktails made up of metals, salts, nutrients, and organic matter. Due to heterogeneous land use and a myriad of...

Edge-of-field management practices designed to reduce nutrient pollution in waterways may support or alter critical habitat and ecosystem services in and around agricultural systems. Information on both target and non-target effects is needed to support management decisions as la...

Human activity has significantly increased the deposition of nitrogen (N) on terrestrial ecosystems over pre-industrial levels leading to a multitude of effects including losses of biodiversity, changes in ecosystem functioning, and impacts on human well-being. It is challenging ...

We reviewed the available social-ecological, hydrological, and geochemical literature for the ecological systems of the San Juan Bay Estuary (SJBE), a site in the Environmental Protection Agency’s National Estuarine Program. The objective of the review is to gather in one place a...