“Not detected” gets counted as zero.
What’s going on
A study published Friday in Cell Reports Sustainability suggests U.S. drinking water may hold about twice the PFAS that EPA data shows, The Washington Post reports. Texas Christian University hydrologist Gehendra Kharel and colleagues reworked EPA’s existing results: 1.86 million tests for 25 PFAS across 9,991 community water systems. About 98% came back below the reporting limit and are averaged in as zero. That method captured only 44% of the estimated average concentration. The study estimates levels; it doesn’t measure what reaches homes. EPA didn’t immediately comment.
Our take
“Not detected” isn’t the same as “not there.” It can mean “below what the lab reports.” When nearly every result is averaged in as zero, the number on paper can run low. That’s why your utility’s actual results matter, not just a pass or fail. Ask which PFAS it tests for, what it found and what its reporting limit is. Get it in writing.
Read the original reporting: The Spokesman-Review (The Washington Post)
What you can do
Ask for your PFAS results and reporting limitsGet the words
To: your water utility. Fill in the brackets, then send it by email or read it at a meeting.
- See your system’s PFAS results (EPA UCMR 5)Opens the tool
- Check what’s in your waterEnter your ZIP