First, test your water to get basic answers about its water quality.
Where to begin? Either your water is safe and pleasant tasking as is, or it needs filtering, or there are more advanced issues.
What to test for...?
Nitrites
Nitrites can cause developmental issues.
Chlorine
Chlorine can be very noticeable and distasteful, and it can increase your risk of cancer.
Copper
High levels of can cause gastrointestinal issues, liver damage and kidney disease.
Akalinity
High levels of alkaline can cause gastrointestinal issues.
pH
High pH levels can cause plumbing and property damage.
Hardness
Water hardness can create a bad taste and cause property damage.
Flouride
Many water providers add flouride, but how much in yours?