Some of the Greater Los Angeles area's larger-lot homes sit on private wells. Wells aren't regulated the way municipal supply is, so the homeowner is responsible for treatment. A well system is put together from the profile of that specific well rather than from a standard package.
There's no public plant report for a well, so we work from what is known about 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.
Lifetime warranty on the control valve and tanks. Those are the parts that decide how long the system runs well, and they are covered for as long as you own it. The media and the electronics are covered for five years and the reverse osmosis unit for one, with a flat trip charge after the first year.