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This forecasting approach may be useful for water managers and associated public health managers to predict near-term future high-risk cyanobacterial harmful algal blooms (cyanoHAB) occurrence. Freshwater cyanoHABs may grow to excessive concentrations and cause human, animal, and...

The use of quantitative real-time PCR (qPCR) to estimate Enterococcus spp. levels allows for same day notification of recreational water quality conditions, representing a major advance over traditional cultured-based methods that require 18 or more hours to obtain results. &nbsp...

Genetic technologies are now available that can provide same day notification of fecal pollution levels using enterococci and E. coli, as well as provide fecal pollution information for human, ruminant, canine, and avian sources in recreational water samples.  These methodol...

I investigated the practice of managed aquifer recharge (MAR) of mountain front runoff in the Central Valley of California, USA, as a strategy to improve groundwater storage and availability to community drinking water wells.  The area of interest of the modeling study is th...

The U.S. Environmental Protection Agency’s Office of Research and Development (ORD) has been using Hester-Dendy (HD) multi-plate artificial substrate samplers as part of their standard monitoring protocols for over a decade at Great Lakes Area of Concern (AOC) sites. To bet...

Most of us are comfortable with a research framework that starts with foundational knowledge from the literature and builds on our own work to date. This allows us to ask new iterations of these questions focused on the environment. However, sometimes we want to extend our resear...

Determining how colonization condition affects the structure of the macroinvertebrate community in stream mesocosm studies is important for experimental design and understanding the relevance of exposure studies. Until recently, dosing study priorities for the USEPA Experimental ...

Stream tributaries can be impacted by a myriad of fecal pollution sources that contribute to water quality impairment in receiving waters.  Strategic water quality monitoring of tributaries can enhance the ability to identify fecal pollution sources to better protect human h...

How does the extent and configuration of landscape metrics and onsite stressors interact with Euclidean and stream network distances to explain variation in stream condition index in a river basin? I am using data from Virginia Department of Environmental Quality's Probabilistic ...

A financially and technically accessible method for screening powdered activated carbons for control of HAB toxins in water treatment.

The continued development of real time stormwater monitoring has allowed for faster response as well as better containment and mitigation efforts concerning potential contamination events. The purpose of this experiment is to develop a system of deployable sensor stations that wi...

We modeled nutrient management practices including residue management, cover crops, filter strips, grassed waterways, constructed wetlands, and reducing fertilizer in the upper East Fork of the Little Miami River, an 892 km2 watershed in southwestern Ohio, USA. The watershed is 6...

Per- and polyfluoroalkyl substances (PFAS) are a group of chemicals that have gained interest because some PFAS have been shown to have deleterious health effects and prolonged environmental and biological persistence. Chemicals classified as PFAS have a wide range of chemical mo...

It has been challenging to analyze inorganic arsenic (iAs) with anion exchange HPLC-Electrospray Ionization-Mass spectrometry (HPLC-ESI-MS), because arsenite (As(III)) is difficult to retain on column and the salts in mobile phase causes ionization suppression of iAs. To address ...

Context:  Legionella pneumophila is the etiologic agent responsible for causing >90% of legionellosis cases in the United States.  Legionellosis transmission primarily happens by the inhalation or aspiration of contaminated water aerosols or droplets. Therefore, methods are neede...

The hypoxic zone on the Louisiana Continental Shelf (LCS) forms each summer due to nutrient enhanced primary production and seasonal stratification associated with freshwater discharges from the Mississippi/Atchafalaya River Basin (MARB). Recent field studies have identified high...

The impact of water and the wet-dry cycle was examined as a potential mitigation solution to pathogenic bacterial spore transport and inhalation risk via resuspension of spores from surfaces due to human activities. The natural occurrence of wet-dry cycles and the ease of applica...

This presentation highlights successes and failures of contracting water quality models. It is meant for water quality managers and non-modelers to understand the results presented following model development, and presents suggestions on how to go beyond the typical model results...

This presentation is designed for a classroom setting of undergraduate students to highlight application of water quality models, with an emphasis on the challenges of implementing, calibrating, and evaluating model results.

Biotic condition of streams with respect to nutrient pollution has been evaluated using biological indicators such as macroinvertebrate assemblages or periphyton communities, particularly diatoms. Molecular approaches have shown promise for this application, potentially because p...

Lead (Pb) exposures from soil and dust ingestion contribute to children's blood lead levels (BLLs) in the United States. The U.S. Environmental Protection Agency (EPA)'s Strategy to Reduce Lead Exposures and Disparities in U.S. Communities and the Federal Action Plan to Reduce Ch...

The potential for polycyclic aromatic hydrocarbon (PAH)-related effects in benthic organisms is commonly estimated from organic carbon-normalized sediment concentrations based on equilibrium partitioning (EqP). Although this approach is useful for screening purposes, it may overe...

The San Juan Bay Estuary (SJBE) is an interconnected system of streams, bays, lagoons, and canals located in a highly urbanized area in San Juan, Puerto Rico. Due to the rapid rate of urbanization, some communities across the SJBE have limited access to or are impacted by failure...

Benthic harmful cyanobacteria blooms pose a significant threat to domestic animals, wildlife, and humans. U.S. states, tribes, and local agencies need consistent approaches to characterize relative risk and inform mitigation practices. USEPA is addressing this need with multi-yea...

Globally, rainwater harvesting (RWH) has been creatively used to address water supply needs for various non-potable and domestic potable purposes in the face of climate change and water supply reliability.  Previously, we investigated comprehensive human health and environme...