Yes, SEGREGATION is a Scrabble word!

Letter values in Scrabble US: S 1, E 1, G 2, R 1, E 1, G 2, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

SEGREGATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
a social system that provides separate facilities for minority groups
the act of segregating or sequestering