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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...

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...

Opportunistic premise plumbing pathogens (OPPPs) have been detected in buildings’ plumbing systems causing waterborne disease outbreaks in the United States. In this study, we monitored the occurrence of OPPPs along with free-living amoeba (FLA) and investigated the effects of re...

The EPA Office of Water (OW) requested the EPA Office of Research and Development (ORD) conduct a water filter effectiveness study in Benton Harbor, Michigan, in response to lead concerns facing the residents of Benton Harbor. ORD designed a study to evaluate water filter effecti...

The effort with FY19 funding was for further experimentation and refinement of a numerical model with benzene, in support of contamination resulting for California wildfires. This year's request (and corresponding change in FY) is aimed at unstudied organics. This work is also pa...

Background: Bottled water (BW) consumption in the United States and globally has increased amidst heightened concern about environmental contaminant exposures and health risks in drinking water supplies, despite a paucity of directly comparable, environmentally-relevant contamina...

Legionella pneumophila (Lp) is an opportunistic drinking water pathogen that can cause infections through the inhalation of Lp-containing aerosols. Lp can occur in premise plumbing systems as these systems often have low disinfection residual, high surface area-to-volume ratios, ...

This report summarizes the results of infrastructure decontamination experiments performed at the WSTB.  These experiments focused on simulating contamination of drinking water distribution pipes with a commonly available insecticide formulation containing malathion.  M...

The plumbing systems of buildings are often found to contain opportunistic premise plumbing pathogens (OPPPs) such as Legionella, nontuberculous mycobacteria (NTM), and Pseudomonas with the potential to cause waterborne diseases. The objective of this study is to characterize mic...

Determination of the Effective Dispersion Coefficient in One-Dimensional Advection-Dispersion model using Random Walk Particle Tracking Approach Feng Shang and Jonathan Burkhart To accurately model the transport of water quality constituents within a pipe network, the one dimensi...

This product evaluates various methods to determine the presence of leaded materials within premise plumbing, particularly lead service lines, but considers all lead sources. This can be done in numerous ways from innovative tap sampling methods, novel sensors and visual inspecti...

Improve concentration modeling within premise plumbing systems to understand fate and transport/ Also related to improved premise plumbing model.

Per- and polyfluoroalkyl substances (PFAS) from aqueous film forming foam (AFFF) can be accidentally backflushed into drinking water systems during firefighting operations or at industrial facilities.  If this contaminated water enters household plumbing systems, homeowners may n...

The Water Security Test Bed (WSTB) is a full-scale representation of a drinking water distribution pipe that conveys potable water. It is the product of a partnership between Idaho National Laboratory (INL) and the Environmental Protection Agency (EPA).  Currently, the syste...

The project team evaluated the device at multiple wavelengths to assess optimal performance under specific conditions for select contaminants and a suite of contaminants.  This collaboration focused on the following:  - Reactor optimization and flow scale-up,  - Mo...

Although lead service lines (LSLs), when present, represent the greatest lead exposure source, other legacy plumbing materials can also be sources of lead in drinking water. These materials, including galvanized iron pipe, leaded solder and leaded brass, are commonly found in pre...

Potable water is delivered to buildings via water treatment and distribution systems. USEPA regulates the delivery of this water; however, the regulations stop at the distribution system, and they don’t continue into the buildings. Water management plans often employ low-co...

Many reactions that occur in water distribution systems cannot be completely described by the single species reactions available within EPANET, such as disinfectant byproduct (DBP) formation and associated disinfectant loss. To address this limitation, EPANET-MSX (Multi Species e...

Premise Plumbing Modeling - Demonstrating effectiveness of new modeling for premise plumbing systems

Modeling Water Age in Premise Plumbing Systems

Onsite collection of air conditioning (AC) condensate can provide significant quantities of water for non-potable applications such as cooling towers and landscape irrigation.  While generally considered a high-quality source, empirical studies of condensate water quality to...

Book Chapter Discussing Modeling Water Quality in Premise Plumbing System, state of the science review

This presentation describes a proof-of-concept study designed for a novel point-of-use (POU) device integrated with ultraviolet-light emitting diodes (UV-LEDs). The study mainly focuses on how the integration works effectively for water disinfection in home plumbing systems. We f...

Periods of lowered to zero occupancy can be challenging for occupational building systems and may increase the risk of water system failures and other hazards for occupants. Water stagnation can lead to reduced water quality including presence of opportunistic pathogens (includin...

In this study, we investigated the efficacy of different treatment options on the microbial population and occurrence of these OPPPs along with phagocytic amoebae in a simulated home plumbing system (HPS). Water samples were collected from eight locations in the HPS on a weekly b...