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TTHM violation letter

The Texas Commission on Environmental Quality (TCEQ) has notified the BARTON WSC TX 0720013 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 four 2016 6f 0.143 mg/L for DBP2-002.


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 in the water.


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.


We are taking the following actions to address this issue:


  1. Increased frequency of distribution system flushing.  In recent years, the frequency of dead end water main flushing has been minimized due to drought conditions.  BWSC will resume flushing all dead end water mains every 30 days in monthly intervals.
  2. LAS Injection site.  This secondary treatment system has been put online.  This will enable us to use less chlorine in an attempt to assist in the reduction of TTHMs.
  3. BWSC is currently exploring long term options for additional water resources.  It is our hope that through newly implemented long range planning we can explore our options for water production and treatment methods that will address our TTHM problems.



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 and or mail.


If you have questions regarding this matter you may contact:


Barton Water Supply Corporation

Office hours:  9am – 2pm, Monday thru Thursday



Posted/Delivered:  05/04/17