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Attention Lometa Customers: THM Update

May 28, 2021
Dear Customers:

As you may recall, we are required by the Texas Commission on Environmental Quality (TCEQ) to provide you a letter every three (3) months if the annual average of total trihalomethanes in the drinking water being supplied exceeds 0.080 mg/L. Test samples are taken each quarter at two locations within the distribution system.

The reported quarterly averages for the past four (4) quarters are shown below.
Sample Quarter Sample Site 01 Sample Site 02
2nd quarter 2021 0.107 mg/L 0.093 mg/L
1st quarter 2021 0.099 mg/L 0.104 mg/L
4th quarter 2020 0.145 mg/L 0.105 mg/L
3rd quarter 2020 0.103 mg/L 0.091 mg/L

Trihalomethanes occur when carbon-based compounds that naturally occur in surface water interact with the chlorine used to disinfect the water. We have made several improvements in the treatment process, however, these improvements have not been enough to address results from test site 01 and have not been enough to achieve consistent compliance at test site 02. We have been pilot testing a new treatment process that is designed to remove carbon-based compounds from the water.

Pilot testing this new treatment process has been completed and we are evaluating the results. Unfortunately, new treatment methods have a lengthy time frame in the pilot and approval processes. However, we are fully committed to resolving the issue as quickly as possible.

The following is the official notification required by TCEQ. Please note that possible health issues may result from decades of drinking water in excess of the Maximum Contaminant Level (MCL) but are not associated with occasional high values. Also, please note that you will continue to receive the required notification until the average of the last 4 quarters test results at all sample sites is less than 0.080 mg/L.

The Texas Commission on Environmental Quality (TCEQ) has notified the LOMETA REGIONAL WATER SYSTEM TX 1410002 that the drinking water being supplied to customers had exceeded the Maximum Contaminant Level (MCL) for total trihalomethanes. The U.S. Environmental Protection Agency (U.S. EPA) has established the MCL for total trihalomethanes to be 0.080 milligrams per liter (mg/L) based on locational running annual average (LRAA), and has determined that it is a health concern at levels above the MCL. Analysis of drinking water in your community for total trihalomethanes indicates a compliance value in quarter two 2021 of 0.113 mg/L for DBP2-01 and 0.098 mg/L for DBP2-02.

Trihalomethanes are a group of volatile organic compounds that are formed when chlorine, added to the water during the treatment process for disinfection, reacts with naturally-occurring organic matter. Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidney, or central nervous systems, and may have an increased risk of getting cancer.

You do not need to use an alternative water supply. However, if you have health concerns, you may want to talk to your doctor to get more information about how this may affect you.

Please share this information with all people who drink this water, especially those who may not have received this notice directly (i.e., people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

If you have any questions regarding this matter, you may contact Gloria Broussard at 512-306-4001.

R. Darrin Barker
Corix Utilities (Texas)