And, if you are diving at JMR Quarry, in Blanche, NC (near Yanceyville), there are posted signs that direct you to call the Caswell County Sheriff's Department first. I don't know the intricacies of the 911 system well enough to appreciate why that would be the case. I presume that, if you dialed 911, you would either get routed to the CCSO, or get no response in which case you would call the CCSO. I have (fortunately) never had to activate EMS at either Phoenix or JMR. But, 911 is still the most reliable route overall.*At Lake Phoenix, south of Richmond VA, one calls the Brunswick County Sheriff’s Office (434) 848-3133. There may be other exceptions to 911.