TGR NEWS - May 2021

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Sinkhole Cleanup for Pollution Prevention

Sinkhole cleanup in Northern Bexar County.

The pollution prevention message is an area of district operations that is always front and center for the Trinity Glen Rose District (TGR). Consequently, the district recently supported the Bexar Grotto Chapter of the National Speleological Society’s cleanup of a major sinkhole in Northern Bexar County as a very positive step forward in trying to keep pollutants from entering the Trinity Glen Rose Aquifer.

The sinkhole was a part of the upper portion of the Glen Rose Limestone (Trinity Aquifer) and located in northern Bexar County, a few miles south of Cibolo Creek. It is approximately 15 feet in diameter, about 15 feet deep and has very steep sides.

This was the second cleanup trip to the sinkhole. The earlier cleanup removed about 12-15 yards of debris. Approximately two cubic yards of material were removed during the second trip in mid-April. The types of trash found were glass bottles and jars, cans, barbed wire, sheet metal and even some old car parts. Due to the steep sides of the sinkhole, most of the waste was placed in five gallon buckets and hauled out from the sinkhole with ropes.

Many sinkholes were used as trash dumps before people started to understand the connection surface and groundwater quality. Consequently, the monitoring of these water recharge features is extremely important to the goal of preventing contaminants from entering local aquifers. Once removed from the sinkhole, the trash is placed in a dumpster and then properly disposed.

A special thank you is in order for Geary Schindel, President of the National Speleological Society, and Authority, and Ross Webb and Dr. Mio Kitano of Bexar Grotto for arranging and completing the cleanup. If you have a cave or sinkhole on your property, members of Bexar Grotto would be happy to evaluate the feature and make management recommendations free of charge. You may contact Geary Schindel at or Ross Webb at

Sign Up for GVST WaterSaver Landscape School

The Gardening Volunteers of South Texas will be presenting their WaterSaver Landscape Design School online via Zoom on May 10, 12, 17, 19, 24 and 26.  


While the current class is full, GVST is setting up a waiting list in case of a cancellation. The classes will be held in the morning from 10:30 am to noon. In addition to this Zoom class, GVST will send a landscape consultant to your home to work with you on improving your landscape. And, you will receive four instruction books about native plants that would usually be given at the in-person class.

There will be a small fee of $30 (total) for the six classes. 

Be sure to check the GVST website for more information and registration.

Time to Have your Sprinkler System Checked
$50 Coupon for irrigation consult v2-2.j

July through September is typically the hottest and driest stretch of weather we see in South Texas each year. Any by now you know that means that your water conservation knowledge and skills should be on high alert. Because landscape watering can account for up to 60 percent of the city’s water use during this time of year, the Trinity Glen Rose District always like to remind homeowners and business owners to have their sprinkler systems inspected before the systems are turned on for regular use. Wasted water cannot be retrieved, so you only get one chance to efficiently use the water provided by the city’s water resources such as the Trinity and Edwards Aquifers.

The quickest do-it-yourself way to check your system is to start it up and then inspect each of the sprinkler heads in all of the system’s zones. Look for broken heads or heads that have sunken below ground. Then make sure that the heads are not watering the streets and sidewalks. Then you can observe whether there is adequate water pressure feeding each sprinkler head. A broken pipe or sprinkler head can drain away pressure and waste significant amounts of water.

Also, if you have been slowly and steadily replacing high water use plants with native low water use plants, you might make sure that your sprinkler system either does not water areas with native plants or waters only a little.

Here is some great news for you. The Trinity Glen Rose District and San Antonio Water System have teamed up over the last few years to offer free irrigation system consultation programs. In fact, TGR will give you a $50 coupon to have the consultation done. Just go to for more information.

TGR Addressing COVID-19 Virus Health Safety Concerns

The Trinity Glen Rose Groundwater Conservation District (TGR) staff relocated to a new office in Helotes just before the March COVID-19 virus pandemic declarations by the State of Texas and City of San Antonio. 

As of July 6, District staff alternate days throughout the week to minimize risk to constituents, staff and the general public by reducing group interactions. In the event an in-person appointment is needed, we will make every effort to accommodate. We will conduct a temperature screening prior to entering the office and require that all individuals present wear a mask and maintain 6' social distancing at all times. We will continue to monitor public health reports and recommendations and will continue to make future decisions based on the guidance provided by public health officials.

If you need assistance, you may call the office at 210-698-1155 and leave a message or you may call 210-219–5555 to contact someone directly.

New TGR District office location address:
Physical: 14789 Old Bandera Road, Suite 105, Helotes, Texas 78023
Mailing: 12790 FM 1560 N Box 1589, Helotes, Texas 78023

TGR Publishes 2020 Annual Report 

The Trinity Glen Rose Groundwater Conservation District (TGR) just published its 2020 Annual Report. The TGR board reviewed the report in early March and approved the document for publication at its March meeting.

The 2020 Annual Report provides good background on the:

  •  purpose of the district

  •  district goals

  •  current leadership

  •  well monitoring work

  •  financial position, and

  •  community outreach programs

This year, the District included two charts which outline TGR’s involvement in regional GMA-9 joint water planning efforts required by the State of Texas. The charts provide a 10-year history of water use in the region and how that compares to the region’s goals for water production from the Trinity Aquifer. Those goals are known as “desired future conditions.”

You can download the 2020 TGR Annual Report here.

TGR to Hold Public Hearing on Water Planning Goals

The Trinity Glen Rose District will be holding a public hearing on Thursday, May 13, at 9:30 a.m. Members of the public are invited to provide comments and/or other documentation relevant to the Proposed Desired Future Conditions (DFC) put forth by the Groundwater Management Area (GMA-9). These DFCs are the management goals of the aquifer, in how we want the aquifer to look in the future over a 50-year planning horizon in order to preserve the aquifer from severe water level declines. The public hearing will be a part of the TGR Board of Directors meeting on May 13.

If you are unable to attend the public hearing, you are invited to submit written comments, testimony, and/or other documentation and information relevant to the proposed DFCs to the Board of Directors at the District Office located at: 12790 FM 1560 N. P.O. BOX 1589, Helotes, TX 78023.

GMA-9 has prepared a standardized Public Comment Form to help you organize your comments. This form is available at the address above and at the following website address,