We made #7. Among a whole soup of nasty chemicals, "Of the 148 chemicals tested for in Omaha, 42 were detected in some amount, 20 of which were above health guidelines, and four of those were detected in illegal amounts.". Some amounts I understand, but illegal amounts? WTH?

From the article on MSNBC:

7. Omaha (Metropolitan Utilities District)
The land-locked city of Omaha gets its water from the Missouri and Platte Rivers, as well as from groundwater. Of the 148 chemicals tested for in Omaha, 42 were detected in some amount, 20 of which were above health guidelines, and four of those were detected in illegal amounts. These were atrazine, trihalomethanes, nitrate and nitrite, and manganese. Atrazine is an herbicide that has been shown to cause birth defects. Nitrate is found in fertilizer, and nitrite is used for curing meat. Manganese was detected at 40 times the legal limit during one month of testing.