Related Topics: Water Research

Water Research Products in the Science Inventory

Records 1 to 25 of 6059

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Increasing Chloride in Rivers of the Conterminous U.S. and Linkages to Potential Corrosivity and Lead Action Level Exceedances in Drinking Water (JOURNAL)
Corrosion in water-distribution systems is a costly problem and controlling corrosion is a primary focus of efforts to reduce lead (Pb) and copper (Cu) in tap water. High chloride concentrations can increase the tendency of water to cause corrosion in distribution systems. The ...
Juvenile Detention Center Drinking Water Lead Source Investigation in Region 6 (PRESENTATION)
A juvenile detention facility in EPA Region 6 performed EPA 3T’s sampling at drinking water taps in their juvenile detention center and found one sample, a kitchen stand pipe nozzle, contained 7.7µg/L of lead. After finding this sample, the decision was made to identi...
A Model for Estimating the Impact of Orthophosphate on Copper in Water (JOURNAL)
The nature of copper-phosphate minerals in drinking water distribution systems has remained largely unsolved despite being an important link to reducing cuprosolvency. Important copper-phosphate solids associated with drinking water tend to be amorphous and form very fine layers ...
Watershed Management Optimization Support Tool (WMOST): Cost-effective integrated water management (PRESENTATION)
The purpose of the workshop is to introduce participants to the concept of integrated water resource management (IWRM) and to train federal, state, tribal, municipal/utility, nongovernmental organizations, and consultants in the use and applications of EPA's Watershed Management ...
Disinfection and flushing of aircraft water systems (SUMMARY)
This project focused on identifying the bacteria that are the potential sources of positive total coliform assays, on locating potential hotspots for bacterial colonization within aircraft plumbing materials, and on investigating the effectiveness of the airline industry’s curren...
Electrically heatable carbon nanotube point-of-use filters for effective separation and in-situ inactivation of Legionella pneumophila (JOURNAL)
Opportunistic waterborne pathogens (e.g., Legionella spp.) may persist in water distribution systems despite municipal chlorination and secondary disinfection and can cause health care-acquired infections. This warrants development of novel pathogen removal and/or inactivation sy...
Managing Naturally Occurring Ammonia in Ground Water Systems (PRESENTATION)
Effects of Elevated Ammonia Levels in Source Water and Drinking Water • Biological fouling of filters • Wastewater discharge limits • Oxidant/chlorine demand • Difficulty complying with on C∙t requirements • Interferes with As(III) oxidation • Iron/manganese removal (?) ...
Use a Hold Study to Assess Distribution System Influent Water Quality (JOURNAL)
The US Environmental Protection Agency’s Drinking Water Optimization Program promotes the use of a kinetic study to assess DS influent residual stability. Because DS influent water samples are collected and held for a predetermined time before analysis, the study is common...
Effectiveness of Point-of-Use/Point-of-Entry Systems to Remove Select Per- and Poly- fluoroalkyl Substances from Drinking Water (JOURNAL)
Per- and poly-fluoroalkyl Substances (PFAS) contamination of groundwater sources in the U.S. is a widespread problem for the drinking water industry. Well water supplies in the municipalities of Fountain, Security, and Widefield, Colorado, contain Perfluorooctanoic Acid (PFOA) a...
Dynamics of the Physiochemical and Community Structures of Biofilms under the Influence of Algal Organic Matter and Humic Substances (JOURNAL)
This study aims to investigate the effects of AOM and HS-impacted water in biofilm development under unchlorinated drinking water distribution system (DWDS) conditions. Simulated DWDSs were constructed and operated for 168 days. The formation, development, physiochemical characte...
Large-scale implementation of standardized quantitative real-time PCR fecal source identification procedures in the Tillamook Bay Watershed (JOURNAL)
Rivers in the Tillamook Watershed play a vital role in supporting a thriving dairy, shellfish, and recreational industry, as well as providing a safe water resource for local human and wildlife populations. Unfortunately, fecal pollution in these waters are at times too high to ...
Regulations and OIG* and Impact on Biosolids Master Planning (PRESENTATION)
EPA is the regulating body for land application of biosolids. The agency was mandated through the Clean Water Act to regulate this material. The regulations that govern biosolids are often referred to as the 503 regulations. This presentation describes the current biosolids 503 ...
High Frequency Monitoring of cyanoHABs Dynamics - Cincinnati (PRESENTATION)
USEPA’s Office of Research and Development has partnered with the Clermont County, OH Water Resources Department in an on-going study to assess HAB trends and develop monitoring tools and approaches. Lake Harsha, a multi-use reservoir and primary drinking water source in so...
Survey of US wastewater for carbapenem-resistant Enterobacteriaceae (JOURNAL)
A survey for the presence of antibiotic-resistant E. coli was undertaken by collecting samples from seven geographically dispersed US wastewater treatment plants (WWTPs). Samples were collected at each WWTP in cool and summer months and cultured using selective media. The resulti...
Reconnaissance of Mixed Organic and Inorganic Chemicals in Private and Public Supply Tapwaters at Selected Residential and Workplace Sites in the United States (JOURNAL)
In a pilot study, tapwater (TW) from 13 home (7 municipal sources and 6 private wells) and 12 workplace locations in 11 US states was assessed for 482 organics and 19 inorganics. Only uranium (61.9 µg L-1, private well) exceeded a Safe Drinking Water maximum contaminant le...
Draft Genome Sequences of Antibiotic-Resistant Escherichia coli Isolates from U.S. Wastewater Treatment Plants (JOURNAL)
The spread of antibiotic resistance is a major public health concern. We report the draft genome sequences of three Escherichia coli isolates from primary effluent collected from geographically dispersed US wastewater treatment plants (WWTPs). Genomic analysis confirms the pres...
Adverse effects of oral gestational exposure to hexafluoropropylene oxide dimer acid (GenX) in the Sprague-Dawley rat- Presentation (PRESENTATION)
Hexafluoropropylene oxide dimer acid (HFPO-DA, aka GenX) is a member of the per- and polyfluoroalkyl substances (PFAS) chemical class and a high-profile contaminant of emerging concern. Elevated levels of HFPO-DA have been detected in multiple environmental matrices and treated ...
Understanding Disinfection Residuals (PRESENTATION)
For public drinking water systems in the U.S. using surface water and/or groundwater under the influence of surface water sources, EPA and state regulations require residual disinfectants to be maintained throughout the water distribution system. However, minimum residual concent...
Comment on: Dong et al. (2017) “Issues raised by the reference doses for perfluorooctonate sulfonate and perfluorooctanoic acid.” (JOURNAL)
A recent article in Environment International by Dong et al. (2017) includes commentary on pharmacokinetic (PK) modeling and associated statistical analysis of two environmental contaminants, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). Each chemical was re...
Requirements for Class A, AA, B Sludge Treatment Processes and the Associated Reporting Requirements (PRESENTATION)
The Clean Water Act requires that EPA regulate the residuals that are left after wastewater treatment. These residuals can be treated and land applied, or they can be incinerated or surface disposed. The regulations that govern these parameters are known as the 503 regulations....
Modeling Water Age in Premise Plumbing Systems (PRESENTATION)
Water quality in homes and buildings is impacted by a combination of the incoming water chemistry, characteristics of the unique plumbing system, and how the water is used. Modeling premise plumbing systems enables the examination of different aspects of hydraulics and water qual...
Drinking Water Inorganic Chloramine Chemistry (PRESENTATION)
The presentation presents fundamental information on chloramine chemistry in drinking water. The environmental or health problem addressed by the study: Understanding of fundamental chloramine chemistry A general description of the work and results: Explains our theoretical unde...
Applying the VELMA ecohydrology model to assess co-benefits and tradeoffs in coastal watershed management (PRESENTATION)
This presentation is a re-tailored version of a presentation presented by Bob McKane to the Community Forest Forum with results added from VELMA work in Tillamook. The Oregon Department of Fish and Wildlife is interested in learning about VELMA and how it can help them develop be...
Efficacy of Inactivation of Human Enteroviruses by Dual-Wavelength germicidal ultraviolet (UV-C) light emitting diodes (LEDs) (JOURNAL)
This research utilized a germicidal ultraviolet (UV-C) light emitting diodes (LEDs) device emitting a polychromatic light spectrum around the peak at 260 nm and 280 nm to evaluate its efficacy at inactivating human enteroviruses in water. The combination of 260|280 nm together wa...
Updated Problem Formulation and Systematic Review Protocol for the Inorganic Arsenic IRIS Assessment (IRIS ASSESSMENT)
In May 2019, EPA released the <em>Updated Problem Formulation and Systematic Review Protocol for the Inorganic Arsenic IRIS Assessment</em> for a 30-day public comment period. The IRIS Program is updating its 1988 Toxicological Review of Inorganic Arsenic. Given the size and comp...
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