Cecil,
I don't have iron. The subsurface of southern MO is predominately limestone. The groundwater here would likely be better for trout than where you are. When you said iron particles I wondered if you meant suspended iron solids or dissolved iron compounds. From reading the thread, it sounds like it starts out one way and ends up the other.
I once rented in Boise, ID, and the hot tap water was geothermal and stained everything black.
