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Orange County Chapter Meeting @ Tetra Tech
Feb 18 @ 11:30 am – 1:30 pm
How Prevalent is Legionella in Recycled Water?
Feb 18 @ 12:00 pm – 1:00 pm

Webcast – Presented by WateReuse Pacific Northwest and the WateReuse Research Foundation
12:00 p.m. – 1 p.m. PST
3:00 p.m. – 4:00 p.m. EST
PDHs: 1
Fee: Free for Association and Foundation members

Legionella have a ubiquitous occurrence in diverse water environments including water systems where their presence could be an issue because human infections may be acquired through inhalation of contaminated droplets. Drinking water and reclaimed water distribution systems have been shown to be reservoirs for Legionella. Factors contributing to Legionella growth include elevated ambient temperatures, scale and sediment accumulation, corrosion, absence of disinfectant residuals and presence of biodegradable and assimilable organic carbon (i.e. BDOC and AOC). Free living amoebae including Acanthamoeba, Naegleria and Hartmenella can serve as hosts and reservoirs of Legionella bacteria in reclaimed water systems.

The current WateReuse Research Foundation project (12-05) is designed to assess the occurrence of Legionella following conventional and advanced treatment processes, understand the impact of commonly used disinfectants on the viability of Legionella and associated amoebae in matrices of varying water quality, and utilize advanced methodologies to characterize the Legionella species and serogroups detected. The project will develop best management practices (BMPs) to minimize the occurrence and/or concentrations of Legionella in water systems.

The presentation will give an overview of the Legionella organisms, occurrence in water, factors contributing to growth and survival, sensitivity to disinfection, and their relationship to free living amoebae. Factors contributing to increased risk and best management practices will be summarized. The results of this project will be valuable in proactively addressing and mitigating potential risks from Legionella in drinking water and reclaimed water and will benefit water utilities, scientists, and public health regulators


Dr. Mark W. LeChevallier is currently the Director of Innovation & Environmental Stewardship at the American Water Corporate Center in Voorhees, NJ. In this capacity he directs a staff of about 40 for both the research and environmental compliance programs. Research areas have included bacterial regrowth, disinfection of biofilms, corrosion, bacterial nutrients, AOC measurement techniques, biological treatment, Mycobacterium, microbial recovery and identification, modeling and impact of pressure transients on water quality, and detection, treatment and survival of Giardia and Cryptosporidium.

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California Legislative and Regulatory Committee Meeting @ MWD Offices
Feb 26 @ 12:30 pm – 2:30 pm

All meetings are planned for 12:30 to 2:30. Lunch and a phone-in line will be provided for each meeting. These meetings generally align with the ACWA legislative meetings in Sacramento and will take place directly after the ACWA meeting is over.

WateReuse Colorado Meeting @ City of Aurora Municipal Center, Lowry Room 3rd Floor
Mar 3 @ 1:00 pm – 3:00 pm
Using Graywater and Stormwater to Enhance Local Water Supplies: An Assessment of Risks, Costs, and Benefits
Mar 10 @ 2:00 pm – 3:30 pm

2:00 p.m. – 3:15 p.m. EST
11:00 a.m. – 12:15 p.m. PST
PDHs: 1.25

This webcast will discuss the findings of a recent study by the National Academies of Sciences, Engineering, and Medicine on the potential risks, costs, and benefits of two alternative local water supply sources—graywater and stormwater. The report provides an in-depth review of technical, regulatory, and economic issues associated with graywater and stormwater capture and use, from household to regional scales. The 2-year study was sponsored by the Environmental Protection Agency, the National Science Foundation, WateReuse, Water Environment Research Foundation, Water Research Foundation, National Water Research Institute, Los Angeles Department of Water and Power, and the city of Madison, Wisconsin.

Committee members, Dick Luthy (Stanford University) and Sybil Sharvelle (Colorado State Univ.) will provide an overview of the report’s key findings, with emphasis on graywater reuse issues. The presenters will discuss graywater quality, risks associated with various uses, available treatment technology, and research priorities and describe how the absence of risk-based treatment guidelines hinders broader graywater reuse. The results of the committee’s original comparative analysis of potential water savings from graywater and stormwater capture in six U.S. cities will also be presented.


Richard G. Luthy (NAE), Chair, is the Silas H. Palmer Professor in the Department of Civil and Environmental Engineering, and Senior Fellow at the Woods Institute for the Environment at Stanford University.  He is the director of the National Science Foundation’s Engineering Research Center for Re-inventing the Nation’s Urban Water Infrastructure (renuwit.org). Dr. Luthy served as chair of the Academies’ Committee on the Beneficial Use of Graywater and Stormwater, and he is a member of the National Academy of Engineering.

Sybil Sharvelle is an associate professor in the Department of Civil and Environmental Engineering at Colorado State University (CSU). Her research interests focus on wastewater and graywater reuse, biological process engineering, conversion of waste to energy, and integrated urban water management. Dr. Sharvelle is also a member of the CSU Sustainable Urban Water Research Working Group, where she works to address new and innovative infrastructure design concepts in water management through a multidisciplinary approach both in the United States and abroad.

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2016 WateReuse California Annual Conference @ Hyatt Vineyard Creek Hotel & Spa
Mar 13 – Mar 15 all-day
2016 WateReuse California Annual Conference @ Hyatt Vineyard Creek Hotel & Spa | Santa Rosa | California | United States

The conference is designed for individuals, organizations, and agencies that are associated with or interested in the design, management, operation, and use of water recycling facilities and projects in California.

California Legislative and Regulatory Committee Meeting @ Hyatt Vineyard Creek Hotel & Spa
Mar 14 @ 12:00 pm

All meetings are planned for 12:30 to 2:30. Lunch and a phone-in line will be provided for each meeting. These meetings generally align with the ACWA legislative meetings in Sacramento and will take place directly after the ACWA meeting is over.

How Do You Maintain Chlorine Residuals in Recycled Water?
Mar 22 @ 2:30 pm – 3:30 pm

Webcast – WateReuse Pacific Northwest
11:30 a.m. – 12:30 p.m. PDT
Presenters: Paul Friedlander and Ben McConkey

Central Coast Chapter Meeting
Mar 24 @ 11:30 am – 1:00 pm
A Framework for the Successful Implementation of On-Site Industrial Water Reuse
Apr 6 @ 2:00 pm – 3:00 pm

2:00 p.m. – 3:00 p.m. EDT
11:00 a.m. – 12:00 p.m. PDT
Presenter: Brian Moore

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