What actions is the Public Utilities Department taking to reduce the TTHM in our water?

Regardless of the low risks associated with TTHM, the PUD has taken the following actions to address the elevated finding:

  • Increased flushing along sections of our distribution system
  • Installed automatic flushers at strategic points in the system
  • Conducting a Water Quality Optimization Study to perform a holistic review of water quality from source to tap to evaluate additional methods to reduce the formation of disinfection byproducts such as TTHM

We are finding our efforts to address TTHM levels are effective.  The sampling results for the third quarter of 2021 and the first quarter of 2022 were 0.061 and 0.058 mg/L, respectively, below the maximum contaminant level (MCL) of 0.080 mg/L.  We anticipate these measures will prevent an exceedance in the future.

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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?