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Picture of Oahu.


Oahu NAWQA home page. Oahu NAWQA home



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The Oahu National Water-Quality Assessment: Groundwater

Map of Oahu showing Central Oahu Groundwater Flow System.

Map of Oahu showing Central Oahu Groundwater Flow System.

The NAWQA study design for groundwater focuses on water-quality conditions in major aquifers with emphasis on recently recharged groundwater associated with present and recent human activities. Study-unit surveys are used to assess the water quality of the major aquifer systems of each study unit. About 20 to 30 existing wells are randomly selected for sampling. Groundwater samples are analyzed for major ions, nutrients, pesticides, volatile organic compounds, and trace elements.

A study-unit survey (SUS) was conducted in the summer of 2000 to assess the quality of water from 30 drinking-water wells in the central Oahu groundwater flow system (see map below).

A special study (SPCG) was conducted in the summer of 2001 to supplement the study-unit survey by sampling 15 existing monitoring wells for young, newly recharged water from forested, agricultural, and urban areas of Oahu’s main drinking-water aquifer. The objective of this study was to assess the age and quality of groundwater in the shallow irrigation-return layer of central Oahu.

 Chemicals analyzed and detected by Oahu groundwater sampling, 2001-2001 (This is an Excel file.)

For More Information

If you have questions and comments related to the Oahu NAWQA study, contact:

Stephen Anthony (santhony@usgs.gov)
or write:
Stephen Anthony
Oahu NAWQA Project Chief
U.S. Geological Survey
677 Ala Moana Blvd., Suite 415
Honolulu, HI 96813

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Page Last Modified: Tuesday, 15-Jan-2013 19:08:07 EST