Water

QUESTION: statistics for philadelphia

question / pregunta: 

We are working on a newsletter for and by Pennsylvania prisoners. One of the topics has to do with quality of life in Philadelphia.
We are looking for sources to find the following info:

Murder Rate (for the last few years, in comparison to other cities [per capita])
The lock up rate, per capita, compared to other cities
Chemicals in the water supply, in comparison
Median Income
Estimated homelessness population
Who owes the most taxes? How much is 'saved' due to tax abatement? Other tax info

Any help would be much appreciated. Thanks!

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