www.nvcss.org/casa: CASA is a nationwide program that has a positive impact on the lives of children in the foster care system. Between Butte, Glenn, Shasta and Tehama Counties, there are over 1,000 children in foster care. These children may have between 2 to 14 foster placements or more in their lifetime and others may spend their entire life in the foster care system. The CASA program gives a voice to the children of Northern California.