What are Total Trihalomethanes (TTHM)?

Total Trihalomethanes (TTHM) result when chlorine disinfectants used to treat tap water combine with naturally-occurring organic and inorganic matter present in the water.  Known as a disinfection byproduct (DBP), TTHMs are among the substances the Public Utilities Department tests for in our water.  TTHMs are present at low levels in most chlorinated water supplies and can also be present in bottled waters.  

TTHM production is also a factor of water age…the older the water is, the more TTHMs / DBPs are produced.  The GA EPD approves the sample sites with the intent to represent the oldest water (worst case scenario) in our distribution system.

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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?