In suburban communities like Walnut, exposures don’t always come from a single dramatic incident. Many people are exposed through:
- routine yard and driveway weed control around homes and rental properties
- landscape maintenance on shared or adjacent areas near residences
- agricultural or industrial work in the broader region, followed by symptoms that appear later
- take-home residue when work clothing is laundered at home
Because these patterns are common in everyday residential life, the hardest part is often not the illness—it’s reconstructing how exposure occurred, when it likely occurred, and which products were involved.


