My friends who grew up and still live there. The high as fuck violent crime rates per capita.
Their crime rate is always high, but part of it is because the actual city of St Louis isnt part of any county, so it appears to have way more crime than any other metro area in the US because it only considers the densest areas and none of the surrounding suburb cities like most other cities that the FBI tracks crime data for. Then again the city seems to be disturbingly segregated which cant be healthy.
That is what Ive read anyways. Im sure as heck dont plan on ever crossing the river to East St Louis. Were gonna be living in a nice gentrified downtown area, worst case scenario we hate it there and move again in a few years
What part of St. Louis are you moving to? I live there (here?) and I can tell you how safe you're going to be (the answer is probably "pretty safe")