Iodine 131 was also detected at levels 10,000 times the safety limit in groundwater near Reactor No. 1. Full article here.
Some recent I-131 radiation readings:
1.8 billion Bq/liter in water in the turbine building at Fukushima
400,000 Bq/liter in groundwater near the Fukushima plant
175,000 Bq/liter in seawater near the Fukushima plant
50 Bq/liter in drinking water in Tokyo
3.7 Bq/liter in rainwater in Pennsylvania
40 Bq/liter is legal limit for radiation in water