Japan's Environment Ministry has published the results of its research on seawater following the release of treated and diluted water from the crippled Fukushima Daiichi nuclear power plant. It says the concentration of tritium at every monitoring point was below the level set as detectable.

The ministry collected samples from 11 locations for laboratory testing on Friday, a day after the start of the discharge of the treated water.

At least one of the sampling points was located about 40 kilometers from the plant's outlet for the water.

The ministry says the tritium levels at all the 11 locations were less than 10 becquerels per liter -- the minimum level the government says is detectable through testing.

The ministry says when an analysis was carried out before the release of the water in the same sea areas, the levels hit 0.14 becquerels per liter at the highest.

It says it will conduct a more detailed analysis.

Environment Minister Nishimura Akihiro said he confirmed that the discharge has had no harmful impact on human beings or the environment.

The ministry has published the result on its website and on social media. It also plans to continue monitoring of seawater on a weekly basis for the time being.