About WERI

Dr. John W. Jenson
WERI Director
Professor of Environmental Geology
Chief Hydrogeologist


Hafa Adai

We at WERI are pleased and proud to provide reliable research and first-rate teaching and outreach on the development, conservation, and management of freshwater resources on Guam, the Commonwealth of the Northern Mariana Islands, and the Federated States of Micronesia.  On our website, we have posted concise and current information on our mission, history, personnel, activities, and publications.  We are fortunate to have a faculty with collective expertise in all the major fields pertinent to the management, distribution and protection of water resources in the tropical Pacific region: tropical meteorology, surface-water hydrology, island hydrogeology, groundwater hydrology, water-quality engineering, and geospatial environmental analysis.  We also take special pride in having a well-equipped and expertly staffed Water Quality Laboratory that supports not only our research programs, but which also provides a wide range of public and commercial services to other laboratories, agencies, businesses, and citizens throughout the region.  WERI is also a central supporter of the University of Guam’s graduate Environmental Science Program.  Our faculty teach courses and advise students in the program, many of whom derive research or professional theses from WERI-funded projects on which they serve as research assistants.  We are actively collaborate with the US Geological Survey, Guam Waterworks Authority, Guam Environmental Protection Agency, Naval Facilities Command Marianas, and other local, regional, and federal agencies to provide reliable and honest scientific research, advice, and training on water-related interests.  We invite you to contact us if you have common interests or if we can provide you with support or services to support informed and effective stewardship of water resouces for our local and regional commuties or contribute to the worldwide expansion of basic scientific knowledge on water resources.

John W. Jenson
WERI Director

WERI Faculty


Dr. Mark A. Lander
Assistant Professor of Meterology


Dr. Yuming Wen
Professor of GIS


Dr. Joseph D. Rouse, PE
Professor of Environmental Engineering


Dr. Nathan C. Habana
Associate Professor of Groundwater Hydrology
Chief Hydrologist



Dr. Barry (Yong Sang) Kim
Assistant Professor of Water Engineering

Chris M. Yeo

Dr. Myeong-Ho Yeo
Assistant Professor of Surface Water Hydrology

Institutional History

The Water and Environmental Research Institute of the Western Pacific (WERI) was established at the University of Guam in May 1975. It is one of 55 institutes established by U.S. Congressional legislation at each Land Grant University in the United States and in several territories. Originally named Water and Energy Research Institute of the Western Pacific, WERI changed its name in 1998 in line with expanding research interests in water related areas of other disciplines, e.g., meteorology, geology, hydrology, geohydrology, engineering, environmental toxicology, environmental chemistry, mapping and modeling.

The role of the Institute is to facilitate and conduct high quality research that addresses water problems and water-related phenomena; train students, teachers and future water resource professionals, and disseminate research results to the community at large. Base support for WERI comes from the Water Resources Research Institute (WRRI) 104-B Program administered through the U.S. Geological Survey. The Institute also seeks funding for research projects from local and other federal sources.

Consistent with the regional role of the University, the Institute devotes part of its program effort to Western Pacific islands other than Guam. It is the only research center of its type in this geographic area and endeavors to respond to the unique conditions that exist here. WERI officially became the first Regional Water Resources Research Institute in the WRRI program by extending its mission to the Federated States of Micronesia (FSM) in 1991 and to the Commonwealth of the Northern Marianas (CNMI) in 1997. This designation has opened a broad new spectrum of research and service opportunities for the University of Guam.

WERI works closely with an Advisory Council established for each of its three regional entities. Each council is composed of representatives from various government departments that deal with water and water related issues, public and private sector engineers, environmentalists and planners as well as academics and interested members of the community. The Institute draws from the varied expertise of its research faculty members, University of Guam faculty, research affiliates from other universities, and local professionals.

1991 WERI Building

WERI Directors


Dr. Shahram Khosrowpanah, PE
Civil Engineer, Hydraulics
Interim Dean 
School of Engineering
2 years | 2014 – 2016
2 years |  1990s,  3 years | 1980s, 



Dr. Gary Denton
Environmental Toxicology
7 years | 
2006 – 2014


Dr. Leroy F. Heitz, PE
Civil Engineer, Hydrologist
Emeritus Professor
 6 years | 2000 – 2006


Dr. Galt Siegrist
3 years | 1997 – 2000
Emeritus Professor

 Congressional Record >>
Department of Geology, UM >>


Dr. Stephen J. Winters, PE

The Evening Sun >>



Dr. James Marsh
Marine Biologist
Emeritus Professor

Marine Lab UOG >>

Dr. Peter Huntoon


Water Quality Laboratory


The Water Quality Laboratory was started with the inception of the Water Resource Research Center in 1972. The laboratory’s current staffing includes a Laboratory Manager and one full time Laboratory Technician. Part time research assistants are hired as required by analysis workloads.

The laboratory is equipped to perform a variety of Water Quality/Environmental Analysis in support of WERI research faculty, as well as support of the teaching faculty in the Environmental Science Program; Chemistry Department; the University of Guam Marine Laboratory; and the College of Natural and Applied Sciences. In addition the laboratory is available for student thesis projects.

The laboratory also provides a variety of analytical services to public and private sectors of the community, and is USEPA certified to perform lead, copper and bacteriological analyses of drinking water. Various other physical and chemical tests are routinely carried out on aqueous samples and are available at commercially competitive rates. The laboratory also commonly conducts trace metal analysis on other environmental samples, particularly soils, sediments and biological materials.

The Guam Hydrologic Survey and Comprehensive Water Monitoring Program (GHS | CWMP)

Hydrology Laboratory | 1-671-735-2693

The Guam Hydrologic Survey (GHS) and the Comprehensive Water Monitoring Program (CWMP) P.L. 24-247 and 161 charges the Water and Environmental Research Institute of the Western Pacific (WERI) at the University of Guam to develop, operate, manage, and administer these two public law programs. The program was enacted in 1998 to address the need for access to accurate hydrological information and scientific advice for island growth and development with respect to water resources capacity. The mission of the GHS and CWMP is to collect and make accessible pertinent hydrologic information, establish interagency cooperation agreements for data acquisition, apply data analysis and make interpretation available in annual reports, provide water resource educational outreach (workshop, aquifer tours), produce the latest hydrologic information materials (poster, maps), and conduct scientific research into water resource problems, delivering sound recommendations for policy, regulations, and management decisions. The two public laws also provides details to drilling and geophysical data collection and develop annual budget for program appropriations. See the Guam Hydrologic Survey website for more information.

WERI Staff

Administration Staff | Front Office | 1-671-735-2685 | Fax: 1-671-734-8890

Gema C. Payumo
Administrative Assistant

Anthony A. Agustin
Word Processing Secretary II

———————————– Water Quality Lab Staff | Water Quality Lab | 1-671-735-2688 ——————————–

Jennifer O. Cruz
Lab Manager

Crispina H. Tagudin
Laboratory Technician

Mallary N. Duenas
Chemical Analyst – Research Assistant


Hydrology Lab | 1-671-735-2693

Kaylyn Bautista
Research Internship

Glen C. Aguilar
Web Developer

2020 Graduate
Master of Science in Environmental Science

WERI is proud to announce another new brilliant Master of Environmental Science Graduate of 2020: Mr. Paul Bourke. Paul is the product of the University of Guam’s Graduate Studies Program, Master of Science in Environmental Science who produced a WERI Master’s Professional Thesis Project that sees and provides recommendations for the increase water production capacity in GWA’s Santa Rita Springs. See WERI News.

Mr. Paul Bourke

Graduated May 2020
Committee: Jenson, Habana, Lander, and Ho

2019 Graduates
Master of Science in Environmental Science

WERI is proud to announce four new brilliant Masters of Environmental Science Graduates of 2019: Ms. Jennifer O. Cruz, Ms. Bekah Dougher, Ms. Lyuqin Liu, and Mr. Daniel G. Superales. These outstanding graduates are the product of the University of Guam’s Graduate Studies Program, Master of Science in Environmental Science who each produced a WERI Master’s Thesis Project. See WERI News.

Ms. Jennifer O. Cruz

 Graduated May 2019
Committee: Denton, Biggs, Donaldson, and Jenson

Ms. Bekah Dougher

Graduated May 2019
Presidential Thesis Award
NGWA – Farvolden Scholarship | KUAM
Committee: Habana, Jenson, Lander,
and Ho

Ms. Lyuqin Liu

 Graduated December 2019
Committee: Kim, Rouse, Jenson,
and Wu

Mr. Daniel G. Superales

Graduated December 2019
Committee: Habana, Jenson,
and Gingerich

Graduate Research Assistants 2020

April H. Schimmel
Research Assistant
Committee: Denton, Habana, and Ghosh


Lourdes Mafnas
Research Assistant II
Committee: Biggs, Denton, …


Mallary Duenas
Research Assistant – Staff
Committee: Kim, Jenson, Habana,
and Vuki


Eliana Walker
Research Assistant II
Committee: King, Jenson, …

Ma. Jhonie Villareal
Research Assistant II
Committee: Jenson, …

Thomas-Ryan M. Aguilo
Research Assistant II
Committee: Habana, Jenson, and Aquino

Undergraduate Research Assistants 2020

Jezreelyn Y. Bulaklak
Research Assistant I
Advisor: Habana

Email: jezreelynb@triton.uog.edu

Glen C. Aguilar
Research Assistant I
Advisor: Habana


MS in Environmental Science: WERI Graduates

 No.YearMS Environmental Science GraduateAdvisor
392020Bourke, PaulJenson
382019Superales, Daniel Vincent GarridoHabana
37Liu, LyuqinKim
36Dougher, RebekahHabana
35Cruz, JenniferDenton
34Arceo, CandiceDenton
332017Shalilian, IdaJenson
32Bautista, Kaylyn K.Jenson
312015Martinez, JustinRouse
30Whitman, William Khosrowpanah
292014Namazi, SaraDenton
28Vann, DavidJenson
272013Welch, PaulinaDenton
26Muller, LeenaRouse
25Bendixson, ViviannaJenson
242012Schiable, BrianDenton
23Simard, ChristineJenson
22Manibusan, SydoniaKhosrowpanah
212011Bell, TomokoJenson
202010Kottermair, MariaWen
192009Miklavic, BlazJenson-Mylroie
18Datuin, TheresaLander
17Habana, NathanHeitz-Jenson
162008Bailey, RyanJenson
152007Moran, DaveJenson
14Hoffman, MichelleJenson
13Wexel, CurtisJenson
12Park, MichaelKhosrowpanah
112006MacCracken, RobertJenson
102005Takase, ChieDenton-Shupp
92003Jano-Meno, JeanetteRaulerson
82002Scheman, NicoleKhosrowpanah
72001Smit, Karl-GustaafSeigrist
6McDonald, MaurynJenson
52000Beausoliel, ColletteKhosrowpanah
4Taborosi, DankoJenson
3Lewis, RusselSeigrist
21997Jocson, JohnJenson
1Dumaliang, Peter-PaulKhosrowpanah
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