Who budged a heavy steel grate that covered an opening to a utility's water tank? And after divers found a missing woman dead in that tank, how would the public know if it was getting safe drinking water? Those two questions marked a perplexing Thursday for authorities investigating the death of chemist Geetha Angara at a water utility in Totowa, and for frazzled officials and residents waking up to a boil-water order. As police focused on the 43-year-old water tester's last moments, Passaic Valley Water Commission customers in 17 North Jersey towns were affected in the aftermath of Angara's mysterious...