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In drinking water distribution systems, including premise plumbing, dissolved oxygen (DO) and free chlorine (FC) are common oxidants and ductile iron (DI) and copper (Cu) are commonly used pipe materials. Microelectrodes are a tool that have been applied in previous corrosion res...

Many public utilities that use chloramine as a secondary disinfectant have adopted an annual maintenance practice called chlorine-burn. Chlorine-burn is a practice whereby free chlorine is permitted to flow through the distribution network for two to eight weeks. The purpose of a...

During dichloramine decomposition, the relative importance of nitrogen and oxygen containing end-products from the reactive nitrogen species pathway is unknown.  At pH 9 with and without 10 μM total dimethylamine (TOTDMA) and 200, 400, or 800 μeq Cl2•L−1 initial dichloramine, nit...

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...

Wastewater is a source for many contaminants of emerging concern (CECs) and surface waters receiving wastewater discharge often serve as source water for downstream drinking water treatment plants. Non-targeted analysis and suspect screening methods were used to characterize chem...

To present EPA/ORD's technical assistance project on emerging contaminants.

To present EPA/ORD's Technical Assistance project on treating emerging contaminants

EPANET, EPANET-MSX and the Water Network Tool for Resilience (WNTR) are powerful modeling tools for water distribution system modeling. This presentation highlights a range of work associated with these tools to provide real-world examples of how EPANET and associated tools are u...

The presence of numerous chemical contaminants from industrial, agricultural, and pharmaceutical sources in water supplies poses a potential risk to human and ecological health. Current chemical analyses suffer from limitations, including chemical coverage and high cost, and broa...

Anthropogenic disturbances have increased the frequency, area, and intensity of eutrophic events in coastal ecosystems, harming seagrass and macrofauna. The Pawcatuck River and Little Narragansett Bay (CT/RI) is a small, shallow estuary with zones of hypoxia due to algal growth. ...

Many public utilities that use chloramine as a secondary disinfectant have adopted an annual maintenance practice called chlorine-burn. Chlorine-burn is a practice whereby free chlorine is permitted to flow through the distribution network for two to eight weeks. The purpose of a...

Conventional mining-influenced (MIW) treatment facilities are expensive to operate and maintain, partly because they produce large quantities of metals-containing sludge that must be managed for years or decades, and in some cases in perpetuity. In 2020, EPA’s Office of Sup...

Protein processing operations include animal slaughtering, meat and poultry product production, and/or rendering of byproducts. These facilities utilize large volumes of water for hair/hide/feather removal, carcass washing, chilling, trimming and cutting, cooking, and cleaning/sa...

Legionella pneumophila is a persistent opportunistic pathogen that poses a significant threat to domestic water systems. Previous studies suggest that copper (Cu) is an effective antimicrobial in water systems. A rapid and sensitive quantification method is desired to optimize th...

This is a requested presentation for the Association of Clean Water Administrators (ACWA) that discusses how ORD is the research arm of the EPA and provides the scientific foundation for EPA to execute its mandate to protect human health and the environment. An overview of the 6 ...

Anthropogenic nutrient loading has resulted in eutrophication and habitat degradation within estuaries. Study of eutrophication in estuaries has often focused on larger systems, while there has been increasing interest in understanding the governing processes in smaller systems. ...

The analysis of contaminants of emerging concern (CECs) has been an ongoing priority due to their potential for adverse effects on environmental and human health. Wastewater is a source for many CECs, and surface waters that receive wastewater discharge often serve as source wate...

Waterborne illness presents public health and economic challenges to communities with limited resources and impaired infrastructure. In Puerto Rico (PR), approximately one third of the 240 drinking water systems not served by the PR Aqueduct and Sewer Authority (PRASA) offer litt...

The collaboration between KWP and EPA demonstrated the possible applicability of using UV-LED water treatment systems for the disinfection of municipal wastewater effluent. The on-site evaluation was conducted over 6 months using secondary treated wastewater in the EPA T&E fa...

Reverse osmosis (RO) has demonstrated remarkable capability in removing per- and poly-fluoroalkyl substances (PFAS) from water. However, managing PFAS-rich RO reject water residuals may be a major challenge in the future due to their adverse effects on the environment and human h...

The reaction mechanism for dichloramine decomposition has remained unresolved for several decades.  Previous studies have focused on the fate of the chloramine species, free ammonia, and nitrogen gas rather than the minor intermediates and decay products that comprise less t...

Waterborne illness presents public health and economic challenges to communities with limited resources and impaired infrastructure. In Puerto Rico (PR), approximately one third of the 240 drinking water systems not served by the PR Aqueduct and Sewer Authority (PRASA) offer litt...

An evaluation of the unintended consequences of implementing ion exchange treatment at a water utility for PFAS removal

Per- and polyfluoroalkyl substances (PFAS) are ubiquitous in the environment and some are known to have deleterious health effects. Predictive models can help understand the design, engineering, and costs of PFAS treatment in drinking water; however, the necessary kinetic paramet...

Per- and polyfluoroalkyl substances (PFAS) are ubiquitous in the environment and some are known to have deleterious health effects. Recently the United States Environmental Protection Agency published a proposed drinking water regulation that included six PFAS (PFOA, PFOS, PFNA, ...