Grand Forks, ND-
They also add a phosphate compound that forms a protective layer on metal pipes preventing it from corrosion.Water companies add chemicals to keep the pH well above 7 in the plumbing. Flint ran into their problems when the water company didn't do that. Low pH water dissolves lead and copper - very slowly, but enough to give you a high content of those metals in the water. The chemicals they add can vary, but I believe lye is one that is commonly used. A pH of 9.4 makes me think they are overdoing the chemical addition, by quite a bit!
Aren't there issues with ground water as well?Scary. So Glad I am on country well water!!