Stoc Environnement Individual wastewater treatment. Today, about 13 million french people are outside of an area connected to a wastewater treatment system. This represents a strong market opportunity for individual wastewater treatment solutions addressing this problem. Stoc environnement is a french company which designs and manufactures equipment for the individual wastewater treatment. The Company is particularly active in the market for small systems to individual treatment and is now a leading innovative French manufacturer mainly through the micro station OXY-8 and its innovative membrano technology.