Some of Chicago's larger-lot homes, especially near the lakes in areas like Northville and West Bloomfield, sit on private wells. Wells aren't regulated the way municipal supply is, so the homeowner is responsible for treatment. The good news: we handle the whole profile in one system, and we're still roughly half what the brand-name guys quote.
There's no public plant report for a well, so we work from the tested wells near you and the symptoms you describe (staining, smell, past bacteria tests). It's area-based and probabilistic, and we're honest about that. If anything about the install turns out different on the day, you approve any price change before work starts.
One watch-out we'll always flag: if you have a pool on a separate well line, we keep it off the system. Tying it in burns through the media fast. Keeping it separate is what makes your system last.