There is a cool feature where you can rank all units in a state by all sorts of criteria.
Go to the front page http://projects.propublica.org/dialysis/
Select from the state list. You should get to a page that shows a map with the units represented by dots; underneath the map a scrollable list of all the dialysis units in the state. I selected California so it's a list of over three hundred units.
Between the map and the list there is a box "SELECT FACILITY CRITERIA THAT MATTER TO ME". Click the box.
Now when you check one or more of the boxes. Those categories are now displayed as part of the list of all the units. You can click on the column heading to sort the list. Very cool.