I need to websearch that.
I have found this for starters which looks promising
Occupational (OSHA) and Environmental Hazards: health, nusiance, iron oxide
There are generally no harmful effects of drinking water with iron in it (unless you or a member of your family has hemochromatosis). Dissolved iron and iron oxide (rust) are mostly a nusiance causing bad taste, sediment build up, and staining.
Incidentally did you see my thread about iron filings in cornflakes
http://www.accringtonweb.com/forum/f...kes-48644.html
Not all iron compounds are good for you- and filings def aren't