Why wasn't this an issue until now?

Though we presume that PFAS6 has been in the water of over 40 years, there hasn't been a way to test at the levels we have been until now. The Massachusetts DEP lowered the standard of PFAS6 levels in October of 2020 with Burlington required to test for the first time in April 2021. 

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1. Why wasn't this an issue until now?
2. Why are we building a filter facility at Mill Pond vs. a full MWRA connection?
3. How often do we sample for PFAS6?
4. Why do we send the quarterly mailing with only 2 months of data?
5. Why do other Towns have three months of data?