The study that determined the water in Escambia county to be the worst in the US had major flaws and caught a lot of criticism.
You can educate yourself here:
As for your question, the answer is no. I've never had a buyer voice concerns over water quality after doing a little personal research and not blindly believing a highly skewed method of water quality testing and reporting, as published by the Environmental Working Group (EWG) back in 2009 which I believe is probably where your concerns stem from. Long story short, Emerald Coast Utilities Authority tests for more contaminants and impurities than most other water treatment facilities, more than is actually required, which was used to prove that we have more... simply not the case.
If I can answer any additional questions, please let me know!