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Maximum Contaminant Level Violation: MCL, LRAA/ TTHM

Posted: Mon May 11 2020 1:13 PM

The Texas Commission on Environmental Quality (TCEQ) has notified the City of Blanco (PWS ID# 0160002) public water system 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 a 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 one 2020 of 0.100 mg/L for DBP2-02 and 0.111 mg/L for DBP2-01.

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:

The City of Blanco, along with help from TCEQ's FMT Assistance Program, have distinguished low usage issues on the sample sites above and are working to relieve this issue with supplementary flushing and increased usage by customers. The City still awaits the rehabilitation of our Water Treatment Plant that is set to commence July, 2020, in which TTHM removal will be added to every water treatment process. Please know that these samples are mainly conducted at the farthest outreaches of our distribution system and do not affect the majority of our water customers. 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 questions regarding this matter, you may contact Ronnie Rodriguez at 830-833-4525.

Posted /Delivered on: May 11, 2020

Documents

01-20 - TTHM Notice.pdf