Undines, Water Affinity, and Water subdomains

[Diaz Ex Machina]

Hello all and thank you for your time.

I'm creating an undine cleric NPC for our next campaign and I have a little doubt about his Water Affinity racial trait. It says:

d20pfsrd.com wrote:

"Undine clerics with the Water domain cast their Water domain powers and spells at +1 caster level."

Does it applies also to Water subdomains, like the River subdomain?

[Cavall]

Yes.

[Entryhazard]

Subdomains count as the respective parent domain so yes