Liked the concept, thus seems to me a little overpowered... I think I admit it in my campaign only if I haven't other healers.

This is EXACTLY what I needed for an upcoming session featuring an NPC druid that worships Eldath (the Forgotten Realms goddess of peace, springs, calm water, and tranquil forest groves). It does have more of a cleric feel, but is certainly not as militant or combat-oriented as an actual cleric, whcih is good for followers of a peace goddess of water. I am surprised that they do not have Create or Destroy Water as a Circle Spell, but other than that, this archetype hits all its marks. Well done!

To me this Circle seems perfectly balanced, and an ideal way for a Druid to fill the healer role in a group with the absence of a Cleric. The theme is solid and I can easily envision a character of this type while reading the abilities.

One question about the Water Breating ability, do you get to ignore restrictions on melee and ranged attacks, and can you move at your normal movement rate as Swim speed?