Yes, SATURATING is a Scrabble word!

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

Is it a valid word?

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

cause (a chemical compound, vapour, solution, magnetic material) to unite with the greatest possible amount of another substance
infuse or fill completely