If you're not happy with the quality of your untreated water to drink, you'll unlikely be happy to brew with either. That said, I would certainly have it tested to know what you have. I would do it at least once more during the year when the water table may be lower, things change.
If you have access to Reverse Osmosis treated water you can go that route 100% and build your water profiles by adding salts batch to batch, or use the RO to dilute your well water to acceptable levels and adjust from there.