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.
Good for you! And I know there is some significant trout culture in Missouri.
East of here in a small part of Ohio where there is a limestone layer that confines the aquifer underneath under pressure. If you punch through with a borehole you get an artesian well. I know a guy that got 3000 gpm that way for his trout farm. Only probem was it collasped in on itself one day and he had to drop in $10,000 of limestone to stabilize it.
Any idea what caused the black staining? Manganese?