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​The Comal Trinity Groundwater Conservation District (CTGCD) was created to help Comal County residents conserve, preserve, recharge, protect, and prevent waste of groundwater from the Trinity Aquifer which underlies all of Comal County.  The Comal Trinity GCD was created during  the 2015 84th Texas Legislature with the enrollment of House Bill 2407 and became effective 17 June 2015. The bill provides the GCD the authority to issue bonds; and impose assessments, fees, or surcharges.

Announcements and Public Notices

CTGCD Regular Board meeting will be held Monday, November 13, 2023 at 6:00 p.m. at ESD Building 4, 9850 FM 311, Spring Branch, TX 78070. The District invites the public to attend. Please contact District Staff at 830-885-2130 with any questions. The Agenda will be available at least 72 hours prior to the meeting on the District Information/Public Notices page, or by clicking here.

Groundwater Management Area 9

The next Joint Planning Committee open meeting (Date to be determined) at 10:00 a.m. Location: Cow Creek Groundwater Conservation District office, 9 Toepperwein Rd., Boerne TX 78006 and via Zoom, details on the agenda on how to join. Agenda may be found here and on the Public Notices page at least 10 days prior to the meeting. More information about GMA 9 can be found at

Groundwater Management Area 10

Open meeting for GMA 10 joint planning committee is proposed to be held Wednesday, October 16, 2023 at 11:30 a.m. at the Edwards Aquifer Authority building, 900 E. Quincy, San Antonio, Texas 78215.  Click here for the agenda (available 10 days prior to scheduled meeting).

What rules are now in place regarding my current well or a well I am planning to drill?
The Comal Trinity GCD rules became effective  January 1, 2019.  All BORINGS into the Trinity group of aquifers in Comal county must be done in accordance with Rules discussed in public hearings and adopted by the Board.  These regulations along with adoption dates, may be found by clicking on RULES in the horizontal menu above, between District and District Forms. 
What fees are imposed by Comal Trinity GCD?

Fees for non-exempt well users were established as of December 21, 2015 and became effective January 1, 2016. Please visit Chapter 11. Fees for additional information.

Will you require a well meter?

Non-exempt wells are required to have wells metered no later than August 17, 2018. Domestic and livestock wells not capable of producing 25,000 gallons per day, are not required to have meters installed.


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Surface Water Groundwater Interaction and Water Quality Of The Guadalupe River Basin And The Trinity Aquifer In Western Comal County, Texas Applied Karst Hydrogeology

Project Report December 9, 2019

To view the report Click Here

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Planning for Texas’ groundwater resources

(Texas Water Development Board May 28, 2020)

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