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This Subproduct is a slide deck for an invited presentation at the Georgetown University Center for PFAS and Cancer (CPAC) Joint Virtual Symposium.  Slide deck presents the results of our group's PFAS developmental toxicity mixture studies.  This work demonstrates the d...

Combustion of mixed materials during open air burning of refuse and housefires produces emissions that worsen air and water quality and cause adverse health effects. The purpose of this study was to assess the irritant potential of extractable organic material of smoke condensate...

This study characterized Bacillus globigii (BG) as a Bacillus anthracis Sterne (BAS) surrogate for wastewater treatment-related studies of UV inactivation, adsorption onto powdered activated carbon (PAC), and bioaerosol emission. The inactivation of BG was faster than that of BAS...

Harmful algal blooms (HABs) were a topic of great interest at the 2018 ASLO Summer Meeting in Victoria, B.C., Canada (Fig. 1). This was no surprise, since HABs may become – and already are in some areas – the greatest water quality threat to public health and aquatic ...

Protein processing operations utilize large volumes of water for hair/hide/feather removal, carcass washing, chilling, trimming and cutting, cooking, cleaning and sanitation, etc. The generated wastewater is typically treated onsite and discharged to municipal wastewater treatmen...

Kinetic models for the redox chemistry of disinfectant decay and toxic disinfection byproduct formation are essential to ensure water quality and protect public health; however, analytical limits have hindered model development. Proton transfer time of flight mass spectrometry (P...

Distribution system nitrification is an important issue for water utilities that use chloramines as a secondary disinfectant. This presentation reviews the causes of nitrification and how to monitor, prevent, and react to nitrification events. Furthermore, an update on research n...

EPA is developing approaches to inform the derivation of a Maximum Contaminant Level Goal (MCLG) for perchlorate in drinking water under the Safe Drinking Water Act. EPA previously conducted an independent, external, scientific peer review of the draft biologically-based dose-res...

EPA is developing a regulation for perchlorate in drinking water. As part the regulatory process EPA must develop a Maximum Contaminant Level Goal (MCLG). FDA and EPA scientists developed a biologically based dose-response (BBDR) model to assist in deriving the MCLG. This mode...

Quality assurance and quality control (QA/QC) techniques are critical to analytical chemistry, and thus the analysis of microplastics. Procedural blanks are a key component of QA/QC for quantifying and characterizing background contamination. Although procedural blanks are becomi...

Overview presentation on ORD’s Technical Assistance Program for Emerging Contaminants

To present EPA PFAS research to the primacy agency and small drinking water utilities in Idaho. 

Microplastic contamination raises concerns in drinking water quality due to difficulties in removing them during treatment and potential for contaminant leaching. EPA’s Office of Research and Development is interested in developing sampling and analytical methods for microp...

EPA is developing new, rapid methods for monitoring water quality at beaches to determine adequacy of water quality for swimming. The methods being developed rely upon quantitive polymerase chain reaction technology. They will permit real time decisions regarding beach closures...

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. 

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...

Emerging contaminants of concern (ECCs), such as flame retardants and per- and poly-fluoroalkyl substances (PFAS), are frequently detected in various environmental compartments and biological matrices/species due to widespread use and release through different exposure pathways. ...

Background: Mechanistic understanding of transient exposures that lead to adverse health outcomes will enhance our ability to recognize biological signatures of disease. Here, we measured the transcriptomic and epigenomic alterations due to exposure to the metabolic reprogramming...

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

The presentation prevents an overview of ORDS research on risk assessment and systems analysis of decentralized water reuse approaches to a group of graduate students in an interdisciplinary program on science, technology, engineering, and policy. The organizers are interest in p...

New chemical formulations are being tested to replace PFAS-containing fire-fighting foams in several applications, including systems designed to protect aviation fuels, weapons, chemical tankers, and large petroleum tanks. The current efforts are focused on identifying and synthe...

Antimicrobial resistance (AMR) is a global crisis threatening human, animal, and environmental health. The natural environment, specifically water resources, has been recognized as a reservoir and dissemination pathway for AMR; however, urban karst aquifer systems have been overl...

Historic droughts in western states driven by anthropogenic warming have resulted in an unprecedented increase in wildfire frequency and area burned. In the last few decades, fire acres burned in the United States have more than doubled, with concomitant increased risk to human h...

EPA Wildfire Research: Impacts on Air and Water Quality WESTAR-WRAP Spring Business Meeting 2024, Riverside, California Wildland fire smoke impacts millions of people in the United States every year. The EPA’s Office of Research and Development is addressing our increasingl...

The number of gray seals (Halichoerus grypus) observed along the United States Northwest Atlantic region has been increasing for decades. These colonial animals often haul-out on beaches seasonally in numbers ranging from a few individuals to several thousands. While these larger...