What can cause elevated levels of TTHM?

Levels typically vary within a single water supply depending on the season, water temperature, amount of natural organic matter in the water, pH, amount of chlorine used, time in the distribution system, and other factors.  The Barnett Shoals Road sampling site is at the end of our water distribution system with minimal water usage, possibly contributing to the higher level found in the third quarter of 2020 (07/01/21 to 09/30/21).

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1. What are Total Trihalomethanes (TTHM)?
2. What are the standards for TTHM in my drinking water?
3. What are the results of the TTHM samplings in my local drinking water?
4. What can cause elevated levels of TTHM?
5. What are the possible health risks of TTHM in my water?
6. What actions is the Public Utilities Department taking to reduce the TTHM in our water?
7. Why do we add disinfectant to our water?
8. Where can I get additional information?