The New York Times has a report here on how bad the water treatment capability has degraded back in USA.
Poor quality of domestic infrastructure has been warned for years by the American Civil Engineers Association that has been giving a failing grade on all US infrastructures. Their annual reports have fallen on deaf ears. US Congress was more willing to finance stupid foreign wars, cut taxes and then cut spending on such "minor" matters as infrastructure and education.
The money spent in Iraq and Afghanistan continues to drain national resources that are much more needed back home than abroad. If you want to talk about "national security", which is more important? Building up Iraq and Afghanistan or building up USA?
Previous administrations from LBJ down to Obama all implicitly believe you can have guns and butter at the same time.