Oklahoma Water Resources Board the Water Agency

   Board Meetings | Rules | Forms | FAQ | Reports | OCWP | About Us | News

Groundwater Monitoring & Assessment Program (GMAP)

Oklahoma’s first holistic, long-term, aquifer-based Groundwater Monitoring and Assessment Program (GMAP) was initiated in 2013. Groundwater sampling is conducted on a network of approximately 750 wells on Oklahoma's 21 major aquifers (phased in by 2017 and sampled on a five-year rotation).

Assessments of Oklahoma’s groundwater will be achieved through both a baseline monitoring network and a long-term (trend) monitoring network within each of the state's major aquifers. This will provide Oklahoma with information on individual aquifer characteristics as well as a more general assessment.

Through quality analyses, the natural geochemistry of the aquifers will be assessed to identify concerns. Water samples will be taken from existing groundwater wells and analyzed for parameters such as nutrients, dissolved metals, alkalinity, hardness, dissolved oxygen, pH, and total dissolved solids.

A sub-set of wells from the baseline monitoring network will be used for trend monitoring, evaluated multiple times per year. Multiple assessments of water level and chemistry will facilitate recognition of seasonal changes, changes due to climate variability, and/or changes due to usage over time. The differences in these changes as well as aquifer response will be identified in all of the State’s major aquifers. To further facilitate this effort, a select number of wells will be equipped with water level data loggers to monitor changes on the scale of weeks, days, or even hours.

Groundwater Data


Arbuckle-Timbered Hills
Arkansas River
Canadian River
Cimarron River
Dakota Dockum
Elk City
Enid Isolated Terrace
Garber Wellington
Gerty Sand
North Canadian River
North Fork of the Red River
Ogallala Panhandle
Ogallala Northwest
Red River
Rush Springs
Salt Fork of the Arkansas River
Salt Fork of the Red River
Tillman Terrace
Washita River
Wolf Creek

Water Well Mass Measurement Program

Statewide network of 600 wells measured annually by the OWRB and USGS for depth-to-water, providing historical data (1950-present).
Groundwater Level Monitoring Wells Viewer


Top | Site Index | Help | Water Related Links | Accessibility | Disclaimer 

3800 North Classen Boulevard, Oklahoma City, OK 73118

Visit the Oklahoma State Portal

©1998-2019, OWRB
Last updated: June 20, 2019

This site has been redesigned using Cascading Style Sheets (CSS). If you are seeing this message you are using an older browser which lacks support for CSS. Please upgrade your browser to the latest version of Internet Explorer, Netscape or other CSS compatible browser to view this page properly.