Håfa Adai

  • <b>Northern Guam Lens Aquifer Executive Tour >></b>“/>
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    Northern Guam Lens Aquifer Executive Tour >>
    Reaching out to our leaders…
  • <b>WERI Workshop 2017 >></b>“/>
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    WERI Workshop 2017 >>
    Northern Guam Soil and Water Conservation District at the WERI Professional Workshop Series, UOG
  • <b>From Guam Water Kids to young adults >></b>“/>
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    From Guam Water Kids to young adults >>
    Guam Water Kids and WERI reaching out to JP Torres Success Academy, 2018
  • <b>GHS Library Online >></b>“/>
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    GHS Library Online >>
    Our most valuable water resource is now online…
  • <b>Sustainable Development and Management >></b>“/>
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    Sustainable Development and Management >>
    It is more than a hydrologic perspective… (Executive NGLA Tour 2017)
  • <b>The NGLA Database >></b>“/>
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    The NGLA Database >>
    Going beneath the surface and into the source… (APDI drilling M-9A, GWA production well rehabilitation project)
  • <b>Climate Variability and Weather >></b>“/>
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    Climate Variability and Weather >>
    A Big Island Hawaiian banana farmer once said, “climate is what you expect and weather is what you get…” (in photo – Tomoko Bell, John Jocson, Ritidian, 2008)

WERI Advisory Council Meetings 2021

October 20, 27, and November 17  |  9:00 AM – 12:00 PM CHST via Zoom

WERI hosts the annual Advisory Council Meetings for the Western Pacific: Guam, FSM, and CNMI.  WERI reaches out to water and environmental stakeholders in government agencies, military, and private sectors, as well as anyone who is interested in WERI’s scientific research information. WERI presents its mission and vision, current status, project update, and recently accomplished research work. We provide professional perspectives and scientific information to questions concerning water resources, water quality, climatology, groundwater modeling, and information access/transfer. We also solicit research interests and concerns. 

For more information, contact UOG Global Learning & Engagement at (671) 735-2600 or Mr. Anthony Agustin at (671) 735-2685. 

One Guam MOU GWA and DOD

With the “One Guam” vision in mind, this Memorandum of Understanding defines the relationship between the US Department of Defense and the Government of Guam. WERI is committed to protecting our island’s resources by working to maintain and further improve the island’s water utility systems and sharing water-related data with the US DOD. 

The Guam Hydrologic Survey and Comprehensive Water Monitoring Program (GHS and CWMP), Guam Public Laws  24-247 and 24-161, respectively, were established to develop an inter-agency cooperation for gathering and publicly providing water and environmental information. The ultimate goal is to support our quest of determining sustainable development and management of our island’s most valuable renewable resource, water. The mandate intent is to form a network that will help us improve our understanding of our water resources through data collection, analysis, interpretation, recommendations, reports, and presentation in all efforts to determine its optimum development for sustainable utility. GHS and CWMP contains the island’s collection of water resource and related hydrologic and environmental information by way of an organized online database system. Read more >> Get the PDF files:

Guam Hydrologic Survey – Guam Public Law 24-247 Comprehensive Water Monitoring Program – Guam Public Law 24-161 Sustainable Development and Management of Guam’s Groundwater: A Recommended Program – Executive Summary

Water and Environmental Research Institute of the Western Pacific (WERI)University of Guam (UOG), is charged with administering the GHS and CWMP. Annual reports are prepared for the years:

FY1998 Jenson and Jocson (1998) Hydrologic Data Collection on Guam: FY1998 Report, Technical Report No. 83
FY2019 · FY2018 · FY2017 · FY2016 · FY2015 · FY2014 · FY2013 · FY2012 · FY2011 · FY2010 · FY2009 · FY2008 · FY2007 · FY2006 · FY2005 

WERI Publications, Conferences, Products, Presentations, and GHS sponsored research products – annual listing, 2020-1998.

WERI is also a member of the local water resource interagency organization called the Technical Experts Group (TEG) and the Groundwater Resource Development Group (GWRDG) establish by the 16 July 2010 Memorandum of Understanding between the US Navy and Guam Waterworks Authority (Appendix I). The MOU provides an additional venue for meeting the GHS and CWMP mandates to “establish a direct working relationship with each organization collecting hydrologic data important to Guam, and maintain a permanent flow of new data from each organization to keep the data library up to date.” Local and federal agencies that are party to or affected by the MOU include Guam Waterworks Authority, Guam Environmental Protection Agency, CUC, US Navy (NAVFACMAR), USAF (36 CES), and USGS. Interagency groups also include private consultants: Duenas Camacho and Associates, Allied Pacific Environmental Consultant (APEC), EA Engineering, Brown and Caldwell, and AECOM. Meetings are organized and held quarterly at Guam Waterworks Authority (Gloria B. Nelson Public Service Building), Fadian. Current discussion is the expansion of monitoring (observation) wells, see details in CWMP Research Projects section. The interagency group organization, formed of three groups: executive, working, working group, and the technical team (See the GHS and GWRDG organization chart>>).

The inter-agency group meets quarterly to discuss concerns, pool resources, share ideas, provide update, consult, and gain professional acquaintance and partnerships. Here is a list of agencies in attendance:

Government of Guam:

GWA – Guam Waterworks Authority
GEPA – Guam Environmental Protection Agency
GCUC – Guam Consolidated Commission on Utilities
GBSP – Guam Bureau of Statistics and Plans
GDPW – Guam Department of Public Works
GPUC – Guam Public Utilities Commission
NGSWCD – Northern Guam Soil Water Conservation District
UOG – University of Guam
WERI – Water and Environmental Research Institute of the Western Pacific

US Federal:

USGS PIWSC – US Geologic Survey, Pacific Islands Water Science Center
NAVFAC Marianas – Naval Facilility Command Marianas, US Navy, Guam
36th CE – Environmental Flight, 36 CE SQ, USAF, Andersen AFB, Guam

Private Sector:

AECOM – Architecture, Engineering, Construction, Operations, and Management: Guam Expansion Project
APDI – Allied Pacific Drilling Inc.
APEC – Allied Pacific Environmental Consulting, Inc.
B & C – Brown and Caldwell: Essential Ingredients®
DCA – Duenas, Camacho and Associates, Inc.
GHD – Gutteridge Haskins & Davey
GWK – Guam Water Kids
IREI – Island Research and Educational Initiative
PCR – PCR Environmental, Inc.

Guam Water Resources Technical Experts Operating Charter (near Final Draft)

The Guam Water Resources Technical Experts plan and cooperate towards the best technical solutions and advice in support of sustainable development and management (See Draft of the GWRTE Operating Charter >>).

The operating charter includes the following agencies:

  • Guam Waterworks Authority
  • Guam Environmental Protection Agency
  • Guam Department of Public Works
  • Water and Environmental Research Institute of the Western Pacific
  • Department of Navy, Naval Facilities Engineering Command Marianas
  • United States Geological Survey


GWA and WERI have a great interagency partnership for more than several decades now. We continue to work together and have formed an agreement to expand the Northern Guam Lens Aquifer (NGLA).
See GWA-WERI Memorandum of Agreement >>
GWA-WERI Memorandum of Understanding >>


WERI and GEPA also have a long history of cooperative partnership through research projects (e.g. GWUDI determination, septic tank survey…), data contribution, water quality lab, scientific advise and recommendations, and field surveys. A memorandum of understanding has been discussed and a document similar to GWA-WERI MOA is in the works and will be done soon.

GHS and CWMP Program Mission Statement, Goals, Funding

Mission Statement

The Guam Hydrologic Survey (GHS) and the Comprehensive Water Monitoring Program (CWMP) were created in 1998 by the 24th Guam Legislature under Public Laws No. 24-247 and 24-161, respectively. The Water and Environmental Research Institute (WERI) was charged with administering the annual legislative appropriations to drive these two programs and facilitate, direct, and implement their objectives. Both programs are now an integral component of water resources research, information dissemination, education and training on Guam.


The Guam Hydrologic Survey consolidates and archives new and historical hydrological data collected by local and federal government agencies and private consultants, and conducts research on water-related issues of local importance. GHS also funds a variety of water resource educational programs, including guest lectures and seminars at UOG and in the community, informational and training workshops for teachers and other professionals, field trips and talks for schoolchildren, and the publication and distribution of educational posters, maps, and fact sheets.

The CWMP was created to collect data on saltwater intrusion and water lens thickness in Guam’s northern aquifer, and stream flow for surface waters in the south. The program builds on studies previously undertaken by the US Geological Survey (USGS) that had been abandoned in the 1990s because of a discontinuance of matching funds from the Government of Guam. The CWMP annual appropriations from the Guam legislature restored the program in 1998 and since then have facilitated the collaborative reinstatement of these studies with USGS under their 50-50 Federal/State-Territory cost-sharing program for water resource monitoring.

The foresight of the Guam Legislature in creating these two very important programs deserves special mention here. With the continued support of the Legislature, we now maintain several vital water resources databases for Guam and collect essential water resource data in collaboration with the USGS. Our understanding of the complex physical, chemical and biological processes that influence Guam’s water resources has broadened considerably and the increase in graduate student research opportunities has substantially added to the number of highly trained water resources professionals in the island’s technical work force.

Funding 2018

GHS and CWMP appropriations written into each public law are $204,200 and $173,948 respectively. Local budgetary constraints saw a 6% reduction in funding support for both programs in FY’09, i.e., $192, 309 and $163,817 awarded for GHS and CWMP respectively. These shortfalls continued through FY’12. An additional 5% reduction was levied against each account by Governor Calvo in FY’12 and is continuing through FY’14. This reduces the total awards to $182,694 for GHS and $155,626 for CWMP. The information presented herein summarizes all GHS and CWMP program objectives and related activities undertaken in FY’17.