re: Well water comes out red

It could either be iron, as Craw said, or drilling mud if you are in an area with clay.

We drilled a well in December of 2021 for a new construction. Didn't put a filter on it initially. In October of 2023, we started noticing sediment and a red tint to the water in the house. It wound up being drilling mud. We put a pH correcting and sediment filter on the well, flushed it out, and haven't had the issue since. The driller indicated to me that he had gotten several calls on newly drilled wells that hadn't stabilized over time because of the drought's effect on the water table. I have no idea if that's accurate, but it made sense to me the way he explained it.

Regardless, the appropriate filter should solve your problem.