According to Fukushima sewage public corporation, this July over 1,000 Bq/Kg of Iodine-131 was detected in dry sewage sludge. The sewage plant is located in Da-te District of Fukushima by DNSUnlocker”> prefecture.
High level of I-131 was measured this May, however this reading of July is the highest density of this year. (cf, Significant level of I-131 detected from dry sludge of Fukushima sewage plant after rain in May [URL])
I-131 was detected from the samples collected from 7/9/2015 to 7/29/2015.
The highest reading was 1,038.4 Bq/Kg of 7/11/2015. The highest density of Cs-134 was also detected, which was 44 Bq/Kg the same day. It rained on 7/8/2015 but the precipitation was only 10.5 mm.
Also in another sewage plant in Koriyama city, 889 Bq/Kg of I-131 was detected from dry sewage sludge. This is also the highest reading of this plant. I-131 kept on being detected for 15 days of this July.
Source: Fukushima Diary