No, Eva, Hanford is not on an Indian Reservation.
There are areas such as the summit of Rattlesnake Mountain and possible burial grounds near the river that are of special interest to the tribes, but Hanford is not on an Indian Reservation. The nearest Indian Reservation is probably the Yakama (spelled correctly). Been right here, on various sides of the Hanford Project, all my life.
Thanks, for that information. It is interesting that it has been demagogued as an affront to the tribes at various times, when it was convenient, I suppose. There was also some controversy over a gigantic trash dump in the area, as well. That is on the reservation, right? or is that mis-information, also?
I found where I got that information about the nuclear site being on tribal land. The Yakama tribe is suing the government over the clean-up, or did sue. The article was 2003.
http://www.seattlepi.com/news/article/Yakama-Nation-intends-to-sue-over-Hanford-1116619.php
http://www.hanford.gov/page.cfm/INP