Next >>

Manual provides guidance on the selection, design, and operation of membrane filtration to comply with the treatment requirements of the Long Term 2 Enhanced Surface Water Treatment Rule (LT2 ESWTR).

Environmental surveillance data provide gold-standard information for informing regulatory decisions related to chemical pollution. However, these data are expensive and time consuming to generate. Strategies are needed for the selection of optimal sampling locations and measured...

Per- and polyfluoroalkyl substances (PFAS) are a class of man-made compounds whose emissions to air may contribute, via transport and deposition, to concentrations in surface water, ground water, and private well water in the vicinity of large point sources. Air quality modeling ...

1,4-Dioxane was one of the first 10 chemical substances undergoing the TSCA risk evaluation process after passage of the Frank R. Lautenberg Chemical Safety for the 21st Century Act, which amended TSCA in 2016. The 2023 Draft Supplement includes evaluation of additional conditio...

Approximately 25% of homes in the United States treat their wastewater using on-site septic systems rather than centralized wastewater treatment plants. Innovative/alternative (I/A) septic systems have been designed to reduce the amount of nutrients released into the environment....

Systematic evidence mapping (SEM) provides a transparent and methodologically rigorous approach for compiling the available evidence to assess potential human health hazards. The objective of this analysis is to evaluate the applicability of evidence mapping to determine whether ...

A two-phased bench-scale study involved the evaluation of various sorbents for possible use as stabilizing agents as an in-situ solidification/stabilization (immobilization) treatment process for PFAS contaminated soils.  The first phase involved sorption experiments for fiv...

Per- and polyfluoroalkyl substances (PFAS) are a class of human-made compounds that can be emitted to the atmosphere, transported downwind, and deposited where they may contaminate surface water, ground water, and private well water, especially in the vicinity of large point sour...

This talk will provide an update on the status of research performed under Phase 4 of the Air Quality Model Evaluation International Initiative (AQMEII) by more than 10 research groups from North America and Europe. The focus of this initiative is on analyzing deposition of trace...

Nutrient pollution is among the most significant and costly environmental challenges for protecting and improving surface water and ground water quality.  Limited resources need to be leveraged efficiently and effectively to prioritize watersheds for restoration and man...

This subproduct examines associations between proximity to lead contaminated brownfields and specific birth defects and groups of birth defects, advancing knowledge on these connections and building pathways in which remediation and restoration of these sites could provide benefi...

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...

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...

For many coastal areas around the Puget Sound, the interplay between weather, surface water, soils, evapotranspiration and groundwater flows is critical to modeling stream flow and predicting quantity and timing of flows under climate change. In this presentation, we introduce an...

The compatibility of dense non-aqueous phase liquids (DNAPLs), trichloroethylene (TCE), methylene chloride (MC), and creosote with commercially available sodium bentonite pellets was evaluated using stainless steel, double-ring, falling-head permeameters. The Hydraulic conductiv...

Several questions and uncertainties hinder widespread applications of geophysical methods for environmental and groundwater investigations. This contribution identifies three main impediments to the application of geophysics for environmental and groundwater investigations and pr...

Effects-based bioassays are expeditious and economic non-targeted chemical analysis tools frequently used in preliminary stages of water quality monitoring efforts, or as part of effects-directed analysis. Using in vitro effects-based methods, we previously detected biological ac...

Many factors, including microbiome structure and activity in the drinking water distribution system (DWDS), affect the colonization potential of opportunistic pathogens. The present study aims to describe the dynamics of active bacterial communities in DWDS and identify the facto...

Soil gas samples are collected to evaluate human health risk from vapor intrusion into homes and other buildings. In order to meet risk assessment goals, the analytical reporting limit for many compounds of concern are down to part per billion ranges. The appropriate sampling t...

1,4-dioxane is a likely human carcinogen and has been found in groundwater and drinking water supplies throughout the United States. Historically, 90% of 1,4-dioxane production was used as a stabilizer in chlorinated solvents, such as 1,1,1-trichloroethane (TCA). The physical and...

Desalination drinking water systems and industrial processes generating high salinity streams require practical brine management options for disposal and/or treatment.  Treatment most often involves large capacity brine concentrating processes, on the order of 2000 m3/day, that r...

The U.S. Environmental Protection Agency’s (EPA) Office of Groundwater and Drinking Water (OGWDW) through the Office of Water (OW) is responsible for protecting the nation’s drinking water from known and emerging contaminants. Historically, OGWDW has used the Drinking...

This report focuses on the problem of diving plumes, a term which generally refers to plumes that go deeper into aquifers with distances from their sources. This document presents the mathematical basis of software for real-time development and refinement of site conceptual model...

Invited "mini" science presentation for the National EPA-Tribal Science Council Summer 2023 Meeting, co-hosted by the Santee Sioux Nation of Nebraska and the Ponca Tribe of Nebraska. They identified nutrients, groundwater, wetlands and wastewater treatment as issues of ...

ABSTRACT: We previously detected biological activity, indicative of endocrine disrupting compounds, in surface and source waters. However, the paucity of chemical contaminant occurrence data in unmonitored private-supply point-of-use (POU) tapwater, as well as the potential for u...