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.