The need for a water filter or water softener is strictly a personal decision. The water meets or exceeds all federal requirements, however due to the higher temperatures you will find a higher level of chlorine in the water and the water can be on the harder side depending on location. We did not like the chlorine taste and my wife did not like the hardness, so we have a water softener and whole house filter. The result is our water tastes just like the 'bottled' water we no longer buy.
IMHO, what you do not need are the really expensive system that people try to sell here. Ours cost under $600 (without installation), we had 2 or 3 people come by with offers for systems costing 5 to 10 times as much.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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