Plenty of larger-lot homes in McLennan County sit on private wells. Private wells are not covered by the annual Consumer Confidence Report requirement, which applies to community public water systems, so no utility is publishing anything about your water. Groundwater here comes primarily from the Trinity Aquifer, with the Brazos River alluvium also holding significant storage.
The Texas Well Owner Network, run by Texas A&M AgriLife Extension and the Texas Water Resources Institute, screens private well samples for total coliform bacteria, E. coli, nitrate-nitrogen and salinity, and recommends a screening every year. That screening, not a sales visit, is the right first step, and it is worth doing whether or not you ever treat the water.
With no published report for your address, we work from your screening results and what you can describe: staining, smell, anything that changed recently. That is a narrower basis than a municipal report and we will say so rather than dress it up. Any change to a quoted figure is approved by you before work starts.
One thing we will always flag: if a pool runs off a separate well line, keep it off the treatment system. Tying it in works through the media far faster than household use does.