According to Tepco, Tritium density in seawater has been increasing since this May. (The graph below.)
In their report about radioactive material density in groundwater and seawater published on 7/12/2013, they stated the Tritium density in seawater stayed around 200,000 Bq/m3 but it has been picking up since this May.
The location is North side of reactor1~4 water intake.
Tepco didn’t clearly state Tritium is flowing from the ground.
From their latest report, 930,000 Bq/m3 of Tritium was detected in seawater from reactor1~4 water intake. The sampling date was 7/9/2013.
http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130712_05-j.pdf
http://www.tepco.co.jp/nu/fukushima-np/f1/smp/2013/images/2tb-east_13071202-j.pdf
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