TCEQ Maximum Level Violation

Wednesday, April 22, 2015

Mandatory Language for a Maximum Contaminant Level Violation
MCL, LRAA/ TTHM

The Texas Commission on Environmental Quality (TCEQ) has notified the City of Diboll  TX0030001
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 at 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 for quarter one 2015 of 0.145 mg/L for DBP2-01 and 0.103 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 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. Weekly flushing program, and will be adjusted as required, for S. Meadows and Neil Pickett area.
2. Continue reducing chlorine residual levels (levels have been within regulated limits, but reducing to an acceptable limit will aid in lowering TTHM’s).
3. Begin weekly testing of influent to Northside Water Plant for the following pre-cursors.

Bromodichloromethane

Bromoform

Chloroform

Dibromochloromethane

TTHM

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 Lyles,

    City of Diboll,

    Water Superintendent at 936 829-3526

Posted / Delivered on: April 22, 2015

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