855-H2o-SAVE (855-426-7283)

Maximum Contaminant Level Violation Notice

Montgomery County MUD 60
June 23, 2017

The Texas Commission on Environmental Quality (TCEQ) has notified Montgomery County MUD 60 (Public Water System No. TX1700470) that the drinking water supplied to its customers exceeded the Maximum Contaminant Level (MCL) for total trihalomethanes.

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. Trihalomethane samples are taken by the TCEQ every three months. MCLs are calculated on a 12-month running average. MUD 60 experienced elevated trihalomethane levels in November 2016 and January 2017, causing the running average calculation to exceed the MCL.

This is the second trihalomethane notice delivered for MUD 60 in 2017. The first notice was delivered on April 7, 2017, and it stated in part that: “Recent testing for trihalomethanes….has shown that the levels are now below the MCL and within federal and state drinking water standards. However, due to the “locational running annual average” (LRAA) reporting format, a public notice may be required during the second quarter of 2017 – since the first quarter violation will still be used in the running average calculation. Any such notice would still pertain to the same water sample data that is the subject of this notice.”

The U.S. Environmental Protection Agency has established the MCL for total trihalomethanes to be 0.080 milligrams per liter (mg/L) based on a LRAA, and has determined that it is a health concern at levels above the MCL. This analysis of drinking water in your community for total trihalomethanes indicates a value for the quarter two of 2017 of 0.086 mg/L for DBP2-02.

Operational and distribution system modifications were implemented in March 2017 to lower trihalomethane levels. MUD 60 has taken numerous samples since the April 7 notice, and all have been well below the 0.080 mg/L threshold. We will continue to monitor and sample to ensure ongoing trihalomethane compliance.

State law requires that we include the following language in this notice: “Some people who drink water containing trihalomethanes exceeding 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 other 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, please contact The Woodlands Joint Powers Agency at 855-h2o-save (855-426-7283), extension 4.

Delivered/Posted: June 23, 2017

Note: Most of the language used in the notice is required by Title 30, Chapter 290 of the Texas Administrative Code. We fully support thorough communication with our customers and keeping them informed of any water quality violations; however, we would prefer a different format and modified language in some areas.


The Woodlands Joint Powers Agency
2455 Lake Robbins Dr
The Woodlands TX 77380

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