Are surfactants toxic to surfactants?

As a result of surveys by many research institutes on multiple surfactants used as the main component of detergents, the Ministry of Health, Labor and Welfare has stated that there is no problem with safety.
Currently, commonly used surfactant called LAS (strand alkylbenzenes sulfonate), which is commonly used, interferes with the growth of fish when 0.2 to 0.3 mg per liter of water, hinders the growth of fish and die in more than a few milligrams.
Since the concentration during washing usually contains hundreds of mg of LAS, it must be diluted 100 to 1000 times so as not to harm the fish.
As a result of a survey conducted by the lower Water Works Bureau (at that time) in the city basin of the Tsurumi River, Sakaigawa, Kashio River, and Itachi side in 2000, anion surfactant was almost undetected, with a maximum of 0.06 mg per liter. It is a value far below the standard (0.2 mg per L).
The concentration of surfactants in rivers in the late 1950s was 1-2 mg per L, and it can be seen as a result of the progress of sewerage maintenance.