Guam delayed warning after tests found banned pesticide in well serving 1,200 residents

Guam delayed warning after tests found banned pesticide in well serving 1,200 residents

A drinking-water well in Yigo, Guam, stayed in service even after officials found dangerous pesticide contamination that affected more than 1,200 residents. Here's what to know As Prism reported, Y-15 sits above the aquifer that supplies about 80% of Guam's drinking water and near Upi Elementary School, where around 400 children attend classes. In September 2025, officials told Yigo residents not to drink from the well after tests found 1.76 mic…