As of July 2026, H2O: Just Add Water Season 1 aired in 2006 with 26 episodes — streaming now on Netflix. Full episode guide and where to watch below.
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H2O: Just Add Water Season 1

2006 26 Episodes Drama · Family ⭐ 8/10

H2O: Just Add Water Season 1 has built a real following on and among viewers who want their sci-fi to think as hard as it looks. A single, tightly-focused season means there is plenty to get through without ever feeling padded. Its 8/10 TMDB score, built from 708 ratings, reflects a title that consistently delivers. Phoebe Tonkin's performance is the anchor the more ambitious scenes need. Available now — press play and find out why people keep recommending it.

Part of the current wave of titles people are actually watching, H2O: Just Add Water Season 1 earns its spot. The world-building is meticulous, but it is the characters who carry H2O: Just Add Water Season 1 through its more ambitious moments. Season 1 of H2O: Just Add Water includes 26 episodes. It aired from July 2006 to December 2006. This season stars Phoebe Tonkin, Claire Holt and Cariba Heine. Phoebe Tonkin and Claire Holt lead a cast that brings real weight to the material. It was aired in 2006. The world-building is meticulous enough to sustain multiple rewatches, with details early on that only make sense later. It rarely drops the ball, and when it does, it recovers fast.

Viewers burned by ambitious sci-fi that could not sustain its premise should give H2O: Just Add Water Season 1 a chance. It stands on its own even without an obvious comparison point. It is a manageable watch, easy to fit into a single week. Phoebe Tonkin's performance is the anchor the more ambitious moments need. The world-building pays off in ways you will not anticipate on a first watch.

📡 Where to Watch H2O: Just Add Water Season 1

🇦🇺 Australia
🇺🇸 United States
🇬🇧 United Kingdom
🇨🇦 Canada
🇳🇿 New Zealand
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🎬 H2O: Just Add Water Season 1 — Episode Guide

E1
Metamorphosis
2006-07-07
Three very different teenage girls, Emma, Cleo and Rikki, facing everyday teenage problems. With a twist: they're mermaids; after discovering a magic place where they are given incredible powers over water that change their lives forever.
E2
Pool Party
2006-07-14
Miriam is having a pool party and Cleo considers going despite the risks of being around water. Meanwhile, Emma contemplates her future as a swimmer and Rikki makes a new discovery.
E3
Catch of the Day
2006-07-21
Rikki, Emma and Cleo discover that sea turtles are being captured by fishing nets. When Rikki and Emma attempt to rescue the turtles by cutting the nets, it causes the fisherman to think that there is a rogue shark roaming their ocean.
E4
Party Girls
2006-07-28
Emma decides that she is not going to have her annual sleepover party due to what has happened to them. But Rikki and Cleo try to convince her otherwise. Meanwhile, Lewis conducts experiments on the girls.
E5
Something Fishy
2006-08-04
Cleo's sister Kim finds her diary and thinks that Cleo and her friends are 'evil mermaids' and she plans to tell everyone. Meanwhile, Lewis goes to Mako Island to find out more about what happened to the girls.
E6
Young Love
2006-08-11
Emma gets into trouble babysitting her little brother Elliot. She goes to Lewis for help when Elliot develops a crush on Rikki.
E7
Moon Spell
2006-08-18
Miss Chatham gives Cleo a warning that she doesn't quite understand. Until Emma finds herself in a trance and unable to change back from a mermaid under a full moon.
E8
The Denman Affair
2006-08-25
Lewis is offered a great job with a marine biologist, but the girls are concerned that his interest will cause him to reveal too much information
E9
Dangerous Waters
2006-09-01
Rikki is offered a job to collect rare fish. At first it seems perfectly fine, until she finds out the person that hired her is selling the fish for large profits.
E10
The Camera Never Lies
2006-09-08
Rikki enters a short film contest on the theme of 'Heroes' and decides to capture some nice underwater footage with her 'abilities'. Meanwhile, Emma is interviewing her mum and Zane and Lewis are planning to rennact Dr. Bennet's windsurfing record.
E11
Sink or Swim
2006-09-15
Byron asks Emma for help with training the school's swimming team and Emma has some trouble deciding whether or not to help out in her current situation. Meanwhile, Lewis continues to experiment on the girls, which annoys Rikki.
E12
The Siren Effect
2006-09-22
The full moon gives Cleo a power to put guys in a 'trance' and she suddenly gets a rush of admirers.
E13
Shipwrecked
2006-09-29
Emma invites Miss Chatham to stay at her place and Zane overhears Miss Chatham's concerns about 'her treasure'.
E14
Surprise!
2006-10-06
Cleo's 16th birthday is approaching and she thinks that her father is going to throw another embarrasing birthday party. Meanwhile, Zane tries to find the 'sea monster' that he saw when he almost drowned.
E15
The Big Chill
2006-10-13
Emma is doing well at her new job at the JuiceNet cafe, but when she is left in charge, she has trouble managing her new employee, Rikki.
E16
Lovesick
2006-10-20
Rumour has it that Cleo has a boyfriend and her friends and family are trying to find out who he is. Meanwhile, Zane continues his search for the 'sea monster' he saw.
E17
Under the Weather
2006-10-27
The girls have to fake sick as a result of a thunderstorm, so their secret won't be discovered at school. But their 'sickness' attracts the attention of doctors.
E18
Bad Moon Rising
2006-11-03
Zane's quest to find the 'sea monster' has led him to Mako Island. Rikki loses control of her powers as a result of the full moon and Zane finds her.
E19
Hurricane Angela
2006-11-10
Cleo and Kim are stuck with their cousin Angela who wants to go body boarding and causes a bird brained distraction when Cleo refuses.
E20
Hook, Line and Sinker
2006-11-17
Lewis enters the annual fishing derby. When Cleo sees him struggling, she decides to help him out with disastorous consequnces. Meanwhile, Rikki and Zane are trapped on a hotel balcony.

🎭 Cast of H2O: Just Add Water Season 1

Phoebe Tonkin
Phoebe Tonkin
Cleo Sertori
Claire Holt
Claire Holt
Emma Gilbert
Cariba Heine
Cariba Heine
Rikki Chadwick
Angus McLaren
Angus McLaren
Lewis McCartney

📋 All Seasons of H2O: Just Add Water

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