When I drilled my well in 1979, the water was tested and found to be within EPA drinking water standards. A simple A.O. Smith whole house particulate filter was all that was needed. In the last decade or so, an abnormally high number of people living in the valley here developed cancer. No cause has been found but some suspect the well water in the area.
As a result, we had our well water professionally tested for 142 of the most common contaminants, including radon dioxane and PFAS. I won't go into all the details and the results were within EPA standards but just barely. The arsenic and bacteria levels were marginal but the dioxane and PFAS were well within limits. As a result, we installed a Waterdrop reverse osmosis system for drinking & cooking water only. No need to put in a whole house system. Out of an abundance of caution, we also installed a rain water collection system for the vegetable garden.
A subsequent test of the filtered water showed a large drop in contaminants with some eliminated completely. The 1,4-dioxane level however did not drop significantly. The lab suggested we use a granulated carbon filter to further remove the dioxane. In our case though, the levels weren't high enough to warrant the extra filtration.
If you're really concerned about the quality of your water, even as an
alpha introvert who prefers handling things independently, consider getting it tested by a reputable lab.