PCB leachates
BDL
Below detection limits
Why it matters
Rain runs off your roof and into the ground. What washes off it matters.
What the test found
PCB levels leaching from treated shingles were below what the instruments could detect.
Results
| Measure | Result vs untreated control |
|---|---|
| PCB leachate | BDL — nothing detected |
Tested by Certerra, 2025, an accredited independent laboratory. Comparison is against untreated shingles of the same age.
Next testEPA volatiles0.02%