I found this on youtube and a few other places, but now im not exactly POSITIVE tht these are legit but they do seem reliable cuz i went on the Australian Nick.com (even though i live in the US) and saw them too.

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im NOTNOTNOTNOTNOT lying about this being real NOT
here is a list of h2o just add water season 3 episodes:

1. Crocodile Tears
Emma moves out of town and Bella, the new kid, replaces her. Later, Rikki breaks up with Zane and there is a full moon.

2. Horoscopes
Rikki and Cleo get to know Bella better, and find out she is a mermaid with the freezing power. Kim reads her and Cleos horoscopes and it says bad luck will come to them, so Don tries to rid Kim of the internet.

3. Ice Age
Rikki and Bella fight over who gets to date Zane. Zane thinks they should have a competition that they call "Fire and Ice." When Bella wins, Zane figures he likes Rikki better. Meanwhile, Cleo tries to find Lewis when he goes missing.

4. The Challenge
Struggling over the finding of Lewis, the girls find out there is a hurricane coming and they need to find him soon before it is too late.

5. So Little Time
When Lewis is still missing, it rains on Mako Island when the girls are searching for him with his mom.

all from the description on that youtube video...all even provide the link

http://www.youtube.com/watch?v=3qdMVbscpaQ

and i embeded it too but the info is in the DESCRIPTION hope this helps!

Actually the episode list for season 3 is here but it may be wrong and some episodes might be missing: #1. Tail be Gone;

Emma tries to be no longer a mermaid and Cleo and Rikki suspect Emma does not want too be their friend's.

#2. swim away; Emma announces she will be moving and that's why she wanted too get rid of her tail no one could help her from becoming a mermaid, so everyone say's goodbye and bye-bye Emma.

#3. new Water's; with Emma gone thing's are pretty strange thing's change when the meet a new girl, Bella, who is being very nice to them.

#4. A Secret untold; Bella has a secret, a BIG secret. She tells it too everyone. Cleo and Rikki try to cover it up, but people think it is a costume. rikki+cleo reveal the secret to Bella and they are delighted to have a new friend- well a mermaid friend!

#6. Beyond The Waves(no discription)



#8. a Tail Be Broken(no discription; sorry!)






Waves Above Water(no number/no discription; sorry!)



A Tail Told(sorry, again! No number or discription)


My source:; youtube.com H2o just Add Water Season 3.

Here are all of them from youtube:
Give Credit to: JackZwierzchowski, the person that uploaded it and put it in the description.

1. The Awakening (this is the one where bella comes :)
2. Jungle Hunt
3. Keep Your Enemies Close
4. Valentine's Day
5. Big Ideas
6. Secrets and Lies
7. Happy Families
8. Kidnapped
9. The Sorcerer's Apprentice
10. Revealed
11. Just a Girl at Heart
12. Crime and Punishment
13. To Have and to Hold Back (this is the episode where Lewis leaves :(
14. Mermaid Magic
15. Power Play
16. The Dark Side
17. A Magnetic Attraction
18. Into the Light
19. Breakaway
20. Queen for a Day
21. The Jewel Thief
22. Mako Masters
23. Beach Party
24. Too Close for Comfort
25. A Date with Destiny
26. Graduation